Office.Body interface

Appends on send the specified content to the end of the item body, after any signature.

To use appendOnSendAsync, you must specify a supplementary permission in the manifest. Details vary with the type of manifest. See Understanding Outlook add-in permissions. To learn more about append-on-send and its configuration, see Implement append-on-send in your Outlook add-in.

appendOnSendAsync(data: string, options: Office.AsyncContextOptions & CoercionTypeOptions, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.9 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass its returned value to the options.coercionType parameter.

Important:

• If the user is running add-ins that implement the on-send feature using ItemSend in the manifest, append-on-send runs before on-send functionality.

• If your add-in implements the on-send feature and calls appendOnSendAsync in the ItemSend handler, the appendOnSendAsync call returns an error as this scenario isn't supported.

• To clear data from a previous appendOnSendAsync call, you can call it again with the data parameter set to null.

• SVG files aren't supported. Use JPG or PNG files instead.

• The appendOnSendAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The appendOnSendAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 5,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html but the message body is in plain text.

Examples

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/20-item-body/append-text-on-send.yaml

// This snippet appends text to the end of the message or appointment's body once it's sent.
const text = $("#text-field").val();

// It's recommended to call getTypeAsync and pass its returned value to the options.coercionType parameter of the appendOnSendAsync call.
Office.context.mailbox.item.body.getTypeAsync((asyncResult) => {
  if (asyncResult.status === Office.AsyncResultStatus.Failed) {
    console.log("Action failed with error: " + asyncResult.error.message);
    return;
  }

  const bodyFormat = asyncResult.value;
  Office.context.mailbox.item.body.appendOnSendAsync(text, { coercionType: bodyFormat }, (asyncResult) => {
    if (asyncResult.status === Office.AsyncResultStatus.Failed) {
      console.log("Action failed with error: " + asyncResult.error.message);
      return;
    }

    console.log(`"${text}" will be appended to the body once the message or appointment is sent. Send the mail item to test this feature.`);
  });
});

Appends on send the specified content to the end of the item body, after any signature.

To use appendOnSendAsync, you must specify a supplementary permission in the manifest. Details vary with the type of manifest. See Understanding Outlook add-in permissions. To learn more about append-on-send and its configuration, see Implement append-on-send in your Outlook add-in.

appendOnSendAsync(data: string, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.9 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass its returned value to the options.coercionType parameter.

Important:

• If the user is running add-ins that implement the on-send feature using ItemSend in the manifest, append-on-send runs before on-send functionality.

• If your add-in implements the on-send feature and calls appendOnSendAsync in the ItemSend handler, the appendOnSendAsync call returns an error as this scenario isn't supported.

• To clear data from a previous appendOnSendAsync call, you can call it again with the data parameter set to null.

• SVG files aren't supported. Use JPG or PNG files instead.

• The appendOnSendAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The appendOnSendAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 5,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html but the message body is in plain text.

Returns the current body in a specified format.

This method returns the entire current body in the format specified by coercionType.

getAsync(coercionType: Office.CoercionType | string, options: Office.AsyncContextOptions, callback?: (asyncResult: Office.AsyncResult<string>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.3 ]

Minimum permission level: read item

Applicable Outlook mode: Compose or Read

Important:

• When working with HTML-formatted bodies, it's important to note that the value returned by the Body.getAsync method won't necessarily be the exact same value that was previously passed in the Body.setAsync method. The client may modify the value passed to setAsync to make it render efficiently with its rendering engine.

• In Outlook on the web and new Outlook on Windows, if the body contains formatted elements, such as tables, lists, and links, specify Office.CoercionType.Html in the getAsync call. Otherwise, you may receive an unexpected value, such as an empty string.

Examples

// This example gets the body of the item as plain text.
Office.context.mailbox.item.body.getAsync(
    "text",
    { asyncContext: "This is passed to the callback" },
    function callback(result) {
        // Do something with the result.
    });

// The following is an example of the result parameter passed to the callback function.
{
    "value": "TEXT of whole body (including threads below)",
    "status": "succeeded",
    "asyncContext": "This is passed to the callback"
}

Returns the current body in a specified format.

This method returns the entire current body in the format specified by coercionType.

getAsync(coercionType: Office.CoercionType | string, callback?: (asyncResult: Office.AsyncResult<string>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.3 ]

Minimum permission level: read item

Applicable Outlook mode: Compose or Read

Important:

• When working with HTML-formatted bodies, it's important to note that the value returned by the Body.getAsync method won't necessarily be the exact same value that was previously passed in the Body.setAsync method. The client may modify the value passed to setAsync to make it render efficiently with its rendering engine.

• In Outlook on the web and new Outlook on Windows, if the body contains formatted elements, such as tables, lists, and links, specify Office.CoercionType.Html in the getAsync call. Otherwise, you may receive an unexpected value, such as an empty string.

Examples

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/20-item-body/add-inline-base64-image.yaml

const mailItem = Office.context.mailbox.item;
const base64String =
  "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";

// Get the current body of the message or appointment.
mailItem.body.getAsync(Office.CoercionType.Html, (bodyResult) => {
  if (bodyResult.status === Office.AsyncResultStatus.Succeeded) {
    // Insert the Base64-encoded image to the beginning of the body.
    const options = { isInline: true, asyncContext: bodyResult.value };
    mailItem.addFileAttachmentFromBase64Async(base64String, "sample.png", options, (attachResult) => {
      if (attachResult.status === Office.AsyncResultStatus.Succeeded) {
        let body = attachResult.asyncContext;
        body = body.replace("<p class=MsoNormal>", `<p class=MsoNormal><img src="cid:sample.png">`);

        mailItem.body.setAsync(body, { coercionType: Office.CoercionType.Html }, (setResult) => {
          if (setResult.status === Office.AsyncResultStatus.Succeeded) {
            console.log("Inline Base64-encoded image added to the body.");
          } else {
            console.log(setResult.error.message);
          }
        });
      } else {
        console.log(attachResult.error.message);
      }
    });
  } else {
    console.log(bodyResult.error.message);
  }
});

Gets a value that indicates whether the content is in HTML or text format.

getTypeAsync(options: Office.AsyncContextOptions, callback?: (asyncResult: Office.AsyncResult<Office.CoercionType>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.1 ]

Minimum permission level: read item

Applicable Outlook mode: Compose

Important: In Outlook on Android and on iOS, this method isn't supported in the Message Compose mode. Only the Appointment Organizer mode is supported. For more information on supported APIs in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

Examples

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/20-item-body/get-body-format.yaml

// Get the mail item's body format (plain text or HTML) and log it to the console.
Office.context.mailbox.item.body.getTypeAsync((asyncResult) => {
  if (asyncResult.status === Office.AsyncResultStatus.Failed) {
    console.log("Action failed with error: " + asyncResult.error.message);
    return;
  }

  console.log("Body format: " + asyncResult.value);
});

Gets a value that indicates whether the content is in HTML or text format.

getTypeAsync(callback?: (asyncResult: Office.AsyncResult<Office.CoercionType>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.1 ]

Minimum permission level: read item

Applicable Outlook mode: Compose

Important: In Outlook on Android and on iOS, this method isn't supported in the Message Compose mode. Only the Appointment Organizer mode is supported. For more information on supported APIs in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

Adds the specified content to the beginning of the item body.

prependAsync(data: string, options: Office.AsyncContextOptions & CoercionTypeOptions, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.1 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass the returned value to the options.coercionType parameter.

Important:

• After the content is prepended, the position of the cursor depends on which client the add-in is running. In Outlook on the web and on Windows (new and classic), the cursor position remains the same in the preexisting content of the body. For example, if the cursor was positioned at the beginning of the body prior to the prependAsync call, it will appear between the prepended content and the preexisting content of the body after the call. In Outlook on Mac, the cursor position isn't preserved. The cursor disappears after the prependAsync call and only reappears when the user selects something in the body of the mail item.

• When working with HTML-formatted bodies, it's important to note that the client may modify the value passed to prependAsync to make it render efficiently with its rendering engine. This means that the value returned from a subsequent call to the Body.getAsync method (introduced in Mailbox 1.3) won't necessarily contain the exact value that was passed in the previous prependAsync call.

• When including links in HTML markup, you can disable online link preview by setting the id attribute on the anchor (<a>) to "LPNoLP" (see the Examples section for a sample).

• In Outlook on Android and on iOS, this method isn't supported in the Message Compose mode. Only the Appointment Organizer mode is supported. For more information on supported APIs in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

• SVG files aren't supported. Use JPG or PNG files instead.

• The prependAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The prependAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 1,000,000 characters.

Examples

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/20-item-body/prepend-text-to-item-body.yaml

/* This snippet adds text to the beginning of the message or appointment's body. 
  
  When prepending a link in HTML markup to the body, you can disable the online link preview by setting the anchor tag's id attribute to "LPNoLP". For example, '<a id="LPNoLP" href="https://www.contoso.com">Click here!</a>'.
*/
const text = $("#text-field").val().toString();

// It's recommended to call getTypeAsync and pass its returned value to the options.coercionType parameter of the prependAsync call.
Office.context.mailbox.item.body.getTypeAsync((asyncResult) => {
  if (asyncResult.status === Office.AsyncResultStatus.Failed) {
    console.log("Action failed with error: " + asyncResult.error.message);
    return;
  }

  const bodyFormat = asyncResult.value;
  Office.context.mailbox.item.body.prependAsync(text, { coercionType: bodyFormat }, (asyncResult) => {
    if (asyncResult.status === Office.AsyncResultStatus.Failed) {
      console.log("Action failed with error: " + asyncResult.error.message);
      return;
    }

    console.log(`"${text}" prepended to the body.`);
  });
});

Adds the specified content to the beginning of the item body.

prependAsync(data: string, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.1 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass the returned value to the options.coercionType parameter.

Important:

• After the content is prepended, the position of the cursor depends on which client the add-in is running. In Outlook on the web and on Windows (new and classic), the cursor position remains the same in the preexisting content of the body. For example, if the cursor was positioned at the beginning of the body prior to the prependAsync call, it will appear between the prepended content and the preexisting content of the body after the call. In Outlook on Mac, the cursor position isn't preserved. The cursor disappears after the prependAsync call and only reappears when the user selects something in the body of the mail item.

• When working with HTML-formatted bodies, it's important to note that the client may modify the value passed to prependAsync to make it render efficiently with its rendering engine. This means that the value returned from a subsequent call to the Body.getAsync method (introduced in Mailbox 1.3) won't necessarily contain the exact value that was passed in the previous prependAsync call.

• When including links in HTML markup, you can disable online link preview by setting the id attribute on the anchor (<a>) to "LPNoLP" (see the Examples section for a sample).

• In Outlook on Android and on iOS, this method isn't supported in the Message Compose mode. Only the Appointment Organizer mode is supported. For more information on supported APIs in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

• SVG files aren't supported. Use JPG or PNG files instead.

• The prependAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The prependAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 1,000,000 characters.

Prepends HTML or plain text to the beginning of a message or appointment body when the mail item is sent.

To use prependOnSendAsync, you must specify a supplementary permission in the manifest. Details vary with the type of manifest. For guidance, see Understanding Outlook add-in permissions.

prependOnSendAsync(data: string, options: Office.AsyncContextOptions & CoercionTypeOptions, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.13 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass its returned value to the options.coercionType parameter.

Important: When implementing prependOnSendAsync, keep the following in mind.

• In a Smart Alerts add-in, the prepend-on-send feature runs first.

• A new line is added after the prepended content.

• If multiple active add-ins call prependOnSendAsync, the order of the inserted content depends on the order in which the add-in runs. The content of the last run add-in appears above previously prepended content.

• If the add-in attempts to insert HTML into a plain text body, the content won't be prepended. Conversely, plain text will be inserted into an HTML body.

• SVG files aren't supported. Use JPG or PNG files instead.

• The prependOnSendAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The prependOnSendAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter exceeds 5,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html, but the item body is in plain text format.

Examples

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/20-item-body/prepend-text-on-send.yaml

// This snippet prepends text to the beginning of the message or appointment's body once it's sent.
const text = $("#text-field").val().toString();

// It's recommended to call getTypeAsync and pass its returned value to the options.coercionType parameter of the prependOnSendAsync call.
Office.context.mailbox.item.body.getTypeAsync((asyncResult) => {
  if (asyncResult.status === Office.AsyncResultStatus.Failed) {
    console.log("Action failed with error: " + asyncResult.error.message);
    return;
  }

  const bodyFormat = asyncResult.value;
  Office.context.mailbox.item.body.prependOnSendAsync(text, { coercionType: bodyFormat }, (asyncResult) => {
    if (asyncResult.status === Office.AsyncResultStatus.Failed) {
      console.log("Action failed with error: " + asyncResult.error.message);
      return;
    }

    console.log(`"${text}" will be prepended to the body once the message or appointment is sent. Send the mail item to test this feature.`);
  });
});

Prepends HTML or plain text to the beginning of a message or appointment body when the mail item is sent.

To use prependOnSendAsync, you must specify a supplementary permission in the manifest. Details vary with the type of manifest. For guidance, see Understanding Outlook add-in permissions.

prependOnSendAsync(data: string, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.13 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass its returned value to the options.coercionType parameter.

Important: When implementing prependOnSendAsync, keep the following in mind.

• In a Smart Alerts add-in, the prepend-on-send feature runs first.

• A new line is added after the prepended content.

• If multiple active add-ins call prependOnSendAsync, the order of the inserted content depends on the order in which the add-in runs. The content of the last run add-in appears above previously prepended content.

• If the add-in attempts to insert HTML into a plain text body, the content won't be prepended. Conversely, plain text will be inserted into an HTML body.

• SVG files aren't supported. Use JPG or PNG files instead.

• The prependOnSendAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The prependOnSendAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter exceeds 5,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html, but the item body is in plain text format.

Replaces the entire body with the specified text.

setAsync(data: string, options: Office.AsyncContextOptions & CoercionTypeOptions, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.3 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass the returned value to the options.coercionType parameter.

Important:

• After the body is replaced with the specified content, the position of the cursor depends on which client the add-in is running. In classic Outlook on Windows, the cursor appears at the beginning of the body of the mail item. In Outlook on the web and new Outlook on Windows, the cursor appears at the end of the body of the mail item. In Outlook on Mac, the cursor position isn't preserved. The cursor disappears after the prependAsync call and only reappears when the user selects something in the body of the mail item.

• When working with HTML-formatted bodies, it's important to note that the value returned by the Body.getAsync method won't necessarily be the exact same value that was previously passed in the Body.setAsync method. The client may modify the value passed to setAsync to make it render efficiently with its rendering engine.

• When including links in HTML markup, you can disable online link preview by setting the id attribute on the anchor (<a>) to "LPNoLP" (see the Examples section for a sample).

• In Outlook on Windows (classic) and on Mac, the add-in user isn't able to revert this action with the Undo command.

• In Outlook on Android and on iOS, this method isn't supported in the Message Compose mode. Only the Appointment Organizer mode is supported. For more information on supported APIs in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

• SVG files aren't supported. Use JPG or PNG files instead.

• The setAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The setAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 1,000,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html and the message body is in plain text.

Examples

// When including links in HTML markup, you can disable online link preview
// by setting the id attribute on the anchor (<a>) to "LPNoLP".
Office.context.mailbox.item.body.setAsync(
    '<a id="LPNoLP" href="http://www.contoso.com">Click here!</a>',
    { 
        coercionType: Office.CoercionType.Html,
        asyncContext: "This is passed to the callback"
    },
    (result) => {
        // Process the result.
    }
);

// The following is an example of the result parameter passed to the callback function.
{
    "value": null,
    "status": "succeeded",
    "asyncContext": "This is passed to the callback"
}

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/20-item-body/add-inline-base64-image.yaml

const mailItem = Office.context.mailbox.item;
const base64String =
  "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";

// Get the current body of the message or appointment.
mailItem.body.getAsync(Office.CoercionType.Html, (bodyResult) => {
  if (bodyResult.status === Office.AsyncResultStatus.Succeeded) {
    // Insert the Base64-encoded image to the beginning of the body.
    const options = { isInline: true, asyncContext: bodyResult.value };
    mailItem.addFileAttachmentFromBase64Async(base64String, "sample.png", options, (attachResult) => {
      if (attachResult.status === Office.AsyncResultStatus.Succeeded) {
        let body = attachResult.asyncContext;
        body = body.replace("<p class=MsoNormal>", `<p class=MsoNormal><img src="cid:sample.png">`);

        mailItem.body.setAsync(body, { coercionType: Office.CoercionType.Html }, (setResult) => {
          if (setResult.status === Office.AsyncResultStatus.Succeeded) {
            console.log("Inline Base64-encoded image added to the body.");
          } else {
            console.log(setResult.error.message);
          }
        });
      } else {
        console.log(attachResult.error.message);
      }
    });
  } else {
    console.log(bodyResult.error.message);
  }
});

Replaces the entire body with the specified text.

setAsync(data: string, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.3 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync, then pass the returned value to the options.coercionType parameter.

Important:

• After the body is replaced with the specified content, the position of the cursor depends on which client the add-in is running. In classic Outlook on Windows, the cursor appears at the beginning of the body of the mail item. In Outlook on the web and new Outlook on Windows, the cursor appears at the end of the body of the mail item. In Outlook on Mac, the cursor position isn't preserved. The cursor disappears after the prependAsync call and only reappears when the user selects something in the body of the mail item.

• When working with HTML-formatted bodies, it's important to note that the value returned by the Body.getAsync method won't necessarily be the exact same value that was previously passed in the Body.setAsync method. The client may modify the value passed to setAsync to make it render efficiently with its rendering engine.

• When including links in HTML markup, you can disable online link preview by setting the id attribute on the anchor (<a>) to "LPNoLP" (see the Examples section for a sample).

• In Outlook on Windows (classic) and on Mac, the add-in user isn't able to revert this action with the Undo command.

• In Outlook on Android and on iOS, this method isn't supported in the Message Compose mode. Only the Appointment Organizer mode is supported. For more information on supported APIs in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

• SVG files aren't supported. Use JPG or PNG files instead.

• The setAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The setAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 1,000,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html and the message body is in plain text.

Replaces the selection in the body with the specified text.

The setSelectedDataAsync method inserts the specified string at the cursor location in the body of the item, or, if text is selected in the editor, it replaces the selected text. If the cursor was never in the body of the item, or if the body of the item lost focus in the UI, the string will be inserted at the top of the body content. After insertion, the cursor is placed at the end of the inserted content.

setSelectedDataAsync(data: string, options: Office.AsyncContextOptions & CoercionTypeOptions, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.1 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync then pass the returned value to the options.coercionType parameter.

Important:

• When including links in HTML markup, you can disable online link preview by setting the id attribute on the anchor (<a>) to "LPNoLP" (see the Examples section for a sample).

• SVG files aren't supported. Use JPG or PNG files instead.

• The setSelectedDataAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The setSelectedDataAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 1,000,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html and the message body is in plain text.

Examples

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/20-item-body/replace-selected-text.yaml

/* This snippet replaces selected text in a message or appointment's body with specified text.
  
  If you want to use a link in HTML markup as a value of the setSelectedDataAsync call's data parameter, you can disable online link preview by setting the anchor tag's id attribute to "LPNoLP". For example, '<a id="LPNoLP" href="https://www.contoso.com">Click here!</a>'.
*/
const text = $("#text-field").val().toString();

// It's recommended to call getTypeAsync and pass its returned value to the options.coercionType parameter of the prependAsync call.
Office.context.mailbox.item.body.getTypeAsync((asyncResult) => {
  if (asyncResult.status === Office.AsyncResultStatus.Failed) {
    console.log("Action failed with error: " + asyncResult.error.message);
    return;
  }

  const bodyFormat = asyncResult.value;
  Office.context.mailbox.item.body.setSelectedDataAsync(text, { coercionType: bodyFormat }, (asyncResult) => {
    if (asyncResult.status === Office.AsyncResultStatus.Failed) {
      console.log("Action failed with error: " + asyncResult.error.message);
      return;
    }

    console.log(`Replaced selected text with "${text}".`);
  });
});

Replaces the selection in the body with the specified text.

The setSelectedDataAsync method inserts the specified string at the cursor location in the body of the item, or, if text is selected in the editor, it replaces the selected text. If the cursor was never in the body of the item, or if the body of the item lost focus in the UI, the string will be inserted at the top of the body content. After insertion, the cursor is placed at the end of the inserted content.

setSelectedDataAsync(data: string, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.1 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Recommended: Call getTypeAsync then pass the returned value to the options.coercionType parameter.

Important:

• When including links in HTML markup, you can disable online link preview by setting the id attribute on the anchor (<a>) to "LPNoLP" (see the Examples section for a sample).

• SVG files aren't supported. Use JPG or PNG files instead.

• The setSelectedDataAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The setSelectedDataAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 1,000,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html and the message body is in plain text.

Adds a signature to the item body if it doesn't have an existing signature. If there's already a signature in the body, replaces that signature.

setSignatureAsync(data: string, options: Office.AsyncContextOptions & CoercionTypeOptions, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.10 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Important:

• In Outlook on the web and new Outlook on Windows, setSignatureAsync only works on messages.

• This method is supported in Message Compose on Outlook on Android and on iOS starting in Version 4.2352.0. For a sample scenario, see Implement event-based activation in Outlook mobile add-ins. To learn more about APIs supported in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

• The behavior of setSignatureAsync differs if you call it in the event handler of an add-in that implements the event-based activation feature using LaunchEvent in the manifest. When the user composes a new item (including reply or forward), the signature is set but doesn't modify the form. This means if the user closes the form without making other edits, they won't be prompted to save changes.

• SVG files aren't supported in mail signatures. Use JPG or PNG files instead.

• The setSignatureAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The setSignatureAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 30,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html and the message body is in plain text.

Examples

// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/90-other-item-apis/work-with-client-signatures.yaml

// Set the signature for the current item with inline image.
const modIcon1Base64 = "iVBORw0KGgoAAAANSUhEUgAAABwAAAAcCAYAAAByDd+UAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA2ZpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMC1jMDYxIDY0LjE0MDk0OSwgMjAxMC8xMi8wNy0xMDo1NzowMSAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDpDRDMxMDg1MjBCNDZFMTExODE2MkM1RUI2M0M4MDYxRCIgeG1wTU06RG9jdW1lbnRJRD0ieG1wLmRpZDpFMTUxQjgyRjQ2MEQxMUUxODlFMkQwNTYzQ0YwMTUxMiIgeG1wTU06SW5zdGFuY2VJRD0ieG1wLmlpZDpFMTUxQjgyRTQ2MEQxMUUxODlFMkQwNTYzQ0YwMTUxMiIgeG1wOkNyZWF0b3JUb29sPSJBZG9iZSBQaG90b3Nob3AgQ1M1LjEgV2luZG93cyI+IDx4bXBNTTpEZXJpdmVkRnJvbSBzdFJlZjppbnN0YW5jZUlEPSJ4bXAuaWlkOkQxMzEwODUyMEI0NkUxMTE4MTYyQzVFQjYzQzgwNjFEIiBzdFJlZjpkb2N1bWVudElEPSJ4bXAuZGlkOkNEMzEwODUyMEI0NkUxMTE4MTYyQzVFQjYzQzgwNjFEIi8+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+uC/WfAAAAehJREFUeNpilCzfwEAEkAbiECA2A2J1IOaHin8E4ptAfBaIVwLxU0IGMRKw0B6IW4DYhoE4cASIK6E0VsCEQ1wUiNcB8QESLGOAqj0MxBuhZhBloS4QnwHiQAbygR/UDF1CFupCXSjHQDmQg5qli8tCUBBsQUoQ1AD8UDNFsVk4n0o+w+bT+egWglKjNymmeGhLkqLcG2oHAwtUoIuQDj5OVgZPLUmwRe5aEmAxqYqNpFgKssOcCeplM0KqdST5GfpDDRm0JfkYrj3/SE7QguyQY4ImYYLgCtAS10kHGMw6dzNsv/qC7OwCClJXYlR++v6b4er3j5QmIFcmaNlIL6AOslCIjhYKMTHQGTBBqxh6gXcgC6/R0cKbIAv30dHCfaAKGJTxHxJSqS3Fz9DkowNmywpyMcgA8fF7b8D8VWcfM6w8+4gYC+VB+RCk8hSh0gaUD4/dewvlvUWRe/z+GzGWgex4BGtiOAHxXhoHpzMoSGHZAhSPW2lo2VZYWkHOh4nEtLrIAE+hZmNUwK+B2BOIv1PRsu9QM1/jatNcBtVZ0IREKXgENesyoVYbzNIdFFi2A5tl+NqlL6BB4QBNzsSCU1A9nlAzMAALAQMOQl0qB23qWwKxIlIrDBQ394H4OBCvISYqAAIMACVibHDqsO7zAAAAAElFTkSuQmCC";
Office.context.mailbox.item.addFileAttachmentFromBase64Async(
  modIcon1Base64,
  "myImage.png",
  { isInline: true },
  function(result) {
    if (result.status == Office.AsyncResultStatus.Succeeded) {
      const signature = $("#signature").val() + "<img src='cid:myImage.png'>";
      console.log(`Setting signature to "${signature}".`);
      Office.context.mailbox.item.body.setSignatureAsync(
        signature,
        { coercionType: "html" },
        function(asyncResult) {
          console.log(`setSignatureAsync: ${asyncResult.status}`);
        }
      );
    } else {
      console.error(`addFileAttachmentFromBase64Async: ${result.error}`);
    }
  }
);

...

// Set the signature for the current item.
const signature = $("#signature").val();
console.log(`Setting signature to "${signature}".`);
Office.context.mailbox.item.body.setSignatureAsync(signature, function(asyncResult) {
  if (asyncResult.status === Office.AsyncResultStatus.Succeeded) {
    console.log("setSignatureAsync succeeded");
  } else {
    console.error(asyncResult.error);
  }
});

Adds a signature to the item body if it doesn't have an existing signature. If there's already a signature in the body, replaces that signature.

setSignatureAsync(data: string, callback?: (asyncResult: Office.AsyncResult<void>) => void): void;

Parameters

Returns

Remarks

[ API set: Mailbox 1.10 ]

Minimum permission level: read/write item

Applicable Outlook mode: Compose

Important:

• In Outlook on the web and new Outlook on Windows, setSignatureAsync only works on messages.

• This method is supported in Message Compose on Outlook on Android and on iOS starting in Version 4.2352.0. For a sample scenario, see Implement event-based activation in Outlook mobile add-ins. To learn more about APIs supported in Outlook mobile, see Outlook JavaScript APIs supported in Outlook on mobile devices.

• The behavior of setSignatureAsync differs if you call it in the event handler of an add-in that implements the event-based activation feature using LaunchEvent in the manifest. When the user composes a new item (including reply or forward), the signature is set but doesn't modify the form. This means if the user closes the form without making other edits, they won't be prompted to save changes.

• SVG files aren't supported in mail signatures. Use JPG or PNG files instead.

• The setSignatureAsync method doesn't support inline CSS. Use internal or external CSS instead.

• The setSignatureAsync method isn't supported on a message that's currently loaded using the loadItemByIdAsync method. For more information, see Activate your Outlook add-in on multiple messages.

Errors:

• DataExceedsMaximumSize: The data parameter is longer than 30,000 characters.

• InvalidFormatError: The options.coercionType parameter is set to Office.CoercionType.Html and the message body is in plain text.