{"id":9373,"date":"2022-01-26T07:20:34","date_gmt":"2022-01-26T15:20:34","guid":{"rendered":"https:\/\/devblogs.microsoft.com\/microsoft365dev\/?p=9373"},"modified":"2022-05-25T17:06:05","modified_gmt":"2022-05-26T00:06:05","slug":"outlook-javascript-api-deprecation-for-attachmentdetails-contenttype-property","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/microsoft365dev\/outlook-javascript-api-deprecation-for-attachmentdetails-contenttype-property\/","title":{"rendered":"Outlook JavaScript API deprecation for contentType property"},"content":{"rendered":"

The <\/span>AttachmentDetails.contentType property<\/span> in the Outlook JavaScript Mailbox API gives an add-in developer the ability to get the MIME content type of an Outlook item attachment. However, while the value returned by the <\/span>contentType<\/span> property is a direct lookup of the attachment\u2019s extension, the internal mapping isn\u2019t actively maintained or standardized. As such, we\u2019ve deprecated this property and recommend you grab the attachment\u2019s extension and process accordingly.<\/span> For example, read the ContentType returns unexpected values<\/a> issue in the GitHub office-js repo.<\/span><\/p>\n

Code sample: contentType property deprecation<\/h2>\n

The following sample code gets the attachment\u2019s file extension then handles if it\u2019s an mp4 video file.<\/span>\u00a0<\/span><\/p>\n

var fileExtension = Office.context.mailbox.item.attachments[0].name.split(\".\").pop().toLowerCase(); \r\n\r\nif (fileExtension == \"mp4\") { \r\n  console.log(\"This is a video file\"); \r\n}<\/pre>\n
The <\/span>contentType<\/span> property is still available to add-ins that currently use it. However, we advise you to replace the reference as soon as possible.<\/span>\u00a0<\/span><\/p>\n
New add-ins should avoid using this property at all.<\/span>\u00a0<\/span><\/p>\n
More resources<\/h3>\n