Paste image into rich text (like gmail)

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I want to be able to copy an image from clipboard, specifically screenshots, and paste them right into a rich text editor, and/or have that file uploaded. We only use chrome so

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情深已故

2021-01-30 12:42

I believe Na7coldwater is correct. The event.clipboardData is being utilised. Please see the following proof of concept:

<html>
<body>
    <div id="rte" contenteditable="true" style="height: 100%; width: 100%; outline: 0; overflow: auto"></div>
    <script type="text/javascript">
        document.getElementById("rte").focus();
        document.body.addEventListener("paste", function(e) {
            for (var i = 0; i < e.clipboardData.items.length; i++) {
                if (e.clipboardData.items[i].kind == "file" && e.clipboardData.items[i].type == "image/png") {
                    // get the blob
                    var imageFile = e.clipboardData.items[i].getAsFile();

                    // read the blob as a data URL
                    var fileReader = new FileReader();
                    fileReader.onloadend = function(e) {
                        // create an image
                        var image = document.createElement("IMG");
                        image.src = this.result;

                        // insert the image
                        var range = window.getSelection().getRangeAt(0);
                        range.insertNode(image);
                        range.collapse(false);

                        // set the selection to after the image
                        var selection = window.getSelection();
                        selection.removeAllRanges();
                        selection.addRange(range);
                    };

                    // TODO: Error Handling!
                    // fileReader.onerror = ...

                    fileReader.readAsDataURL(imageFile);

                    // prevent the default paste action
                    e.preventDefault();

                    // only paste 1 image at a time
                    break;
                }
            }
        });         
    </script>
</body>

Gmail uploads the image via XMLHttpRequest instead of embedding it directly as a data URL. A search on Google or SO for drag & drop file uploads should reveal how this can be achieved.

Please bare in mind that this is just a proof of concept. Error handling and browser/feature detection code is not included.

Hope this helps!

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