Question

Note: This image upload feature is available for TinyMCE version 4.3 and above. Alternatively, the PowerPaste plugin is capable of this functionality in versions of TinyMCE 4.0 and above.

The image uploader is designed to complement the new image editing functionality of TinyMCE. Images that are edited within TinyMCE can be uploaded using this function. Local images that are added through other means, for example drag and drop when using the paste_data_images configuration property, or using Tiny’s PowerPaste Plugin.

Once uploaded, TinyMCE automatically updates the <image> src attribute with the new path to the remote image.

Local images can be uploaded to TinyMCE through the use of the new editor.uploadImages() function. This functionality is handled asynchronously, meaning that it is possible for users to save their content before all images have completed uploading. If this occurs and no server path to the remote image is available, the images are saved as Base 64.

It is recommended that the editor.uploadImages() function be executed before submitting the editor contents to the server, to avoid saving content as Base 64. Once all the images are uploaded, a success callback can be utilized to execute the code. This success callback can be used to save the editor’s content to the server through a POST.

Using uploadImages with jQuery

tinymce.activeEditor.uploadImages(function(success) {
  $.post('ajax/post.php', tinymce.activeEditor.getContent()).done(function() {
	console.log("Uploaded images and posted content as an ajax request.");
  });
});

Using uploadImages and then posting a form

tinymce.activeEditor.uploadImages(function(success) {
   document.forms[0].submit();
});

Image uploader requirements

A server-side upload handler script that accepts images on the server saves them appropriately and returns a JSON object containing the location of the saved images is necessary to upload local images to a remote server.

An example PHP upload handler implementation is available here.

Images are sent to the Image Uploader via HTTP POST with each post containing a single image. The image handler at the URL referenced in the images_upload_url takes care of the process required to “save” the image in your application. Some examples would include:

• Save the item in a folder on your web server
• Save the item on a CDN server
• Save the item in a database
• Save the item in an asset management system

When the image is uploaded it has a standardized name in the post (e.g. blobid0, blobid1, imagetools0, imagetools1).

Note: Ensure that your upload handler script takes each uploaded file and generates a unique name before saving the image. For example, users could append the current time (in milliseconds) to the end of the file name which would lead to file names like blobid0-1458428901092.png or blobid0-1460405299-0114.png. Please ensure that the file name is unique, so files are not overwritten accidentally!

This server-side upload handler must return a JSON object that contains a location property. This property should represent the remote location or filename of the newly uploaded image.

{ location : '/uploaded/image/path/image.png' }

Image uploader options

There are multiple configuration options that affect the operation of this feature. These options are listed below.

Note: For image uploads to function correctly, either the images_upload_url or images_upload_handler options must be set.

Image Upload Handling Option	Description
images_upload_url	This option lets you specify a URL to where you want images to be uploaded when you call editor.uploadImages.
images_upload_base_path	This option lets you specify a basepath to prepend to urls returned from the configured images_upload_url page.
images_upload_credentials	This option lets you specify if calls to the configured images_upload_url should pass along credentials like cookies etc cross domain. This is disabled by default.
images_upload_handler	This option lets you replace TinyMCE’s default JavaScript upload handler function with custom logic. The upload handler function takes three arguments, blobInfo, a success callback, and a failure callback. When this option is not set, TinyMCE utilizes an XMLHttpRequest to upload images one at a time to the server, and calls the success callback with the location of the remote image.

Example of typical setup

tinymce.init({
  selector: 'textarea',  // change this value according to your html
  images_upload_url: 'postAcceptor.php',
  images_upload_base_path: '/some/basepath',
  images_upload_credentials: true
});

Rolling your image handler

Change the default behavior of TinyMCE’s image upload logic by changing the images_upload_handler configuration property.

Note: Please note that while using this option, other image uploader options are not necessary. Additionally, to replace the tag's src attribute with the remote location, please use the success callback defined in the `image_upload_handler` function with the returned JSON object's location property.

Example

tinymce.init({
  selector: 'textarea',  // change this value according to your HTML
  images_upload_handler: function (blobInfo, success, failure) {
	var xhr, formData;
	xhr = new XMLHttpRequest();
	xhr.withCredentials = false;
	xhr.open('POST', 'postAcceptor.php');
	xhr.onload = function() {
	  var json;

	  if (xhr.status != 200) {
		failure('HTTP Error: ' + xhr.status);
		return;
	  }
	  json = JSON.parse(xhr.responseText);

	  if (!json || typeof json.location != 'string') {
		failure('Invalid JSON: ' + xhr.responseText);
		return;
	  }
	  success(json.location);
	};
	formData = new FormData();
	formData.append('file', blobInfo.blob(), fileName(blobInfo));
	xhr.send(formData);
  }
});

CORS considerations

Configure Cross-origin resource sharing (CORS) to allow the web application to upload image data to a separate domain. This ensures compliance with JavaScript same-origin restrictions.

CORS has stringent rules about what constitutes a cross-origin request. The browser can require CORS headers when uploading to the same server the editor is hosted on, for example:

• A different port on the same domain name
• Using the host IP address instead of the domain name
• Swapping between HTTP and HTTPS for the page and the upload script

The upload script URL origin must exactly match the origin of the URL in the address bar, or CORS headers should be provided to the browser to access it. A good way to guarantee this is to use a relative URL to specify the script address, instead of an absolute one.

All supported browsers print a message to the JavaScript console if there is a CORS error.

The PHP upload handler script provided here configures CORS in the $accepted_origins variable. Configure CORS at the web application layer or the HTTP server layer.

Further reading on CORS

• W3C Wiki - CORS Enabled
• MDN - HTTP access control (CORS)
• W3C - Cross-Origin Resource Sharing Specification

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