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IE does not allow you to upload a file if the file input it was selected with was tampered with JavaScript. Triggering that click event taints your file input so if you try to upload the file you get access denied. See also getting access is denied error on IE8

internet explorer - jquery.form.js image uploading isn't working in IE...

jquery internet-explorer jquery-plugins file-upload
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I was able to make it work on Internet Explorer 8 using the code below. The problem is that if I have multiple file uploads I cant use the code below.

function readURL(input) {
            if (input.files && input.files[0]) {
                var reader = new FileReader();

                reader.onload = function (e) {
                    $(".imagePreview1").css("background-image", "url("+this.result+")");
                    $("#definitionModal .image-upload").css("display" , "none");
                    $("#definitionModal .grid2").css("display" , "block");
                }

                reader.readAsDataURL(input.files[0]);
            }
        }

        $("#uploadFile1").change(function(){
            readURL(this);
        });

javascript - Preview an image before upload not working in Internet Ex...

javascript jquery html file-upload internet-explorer-8
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I'm not fully familiar with the medium-editor-insert-plugin, so I'm not sure if this is related to your issue or not. I'll attempt to get more familiar with the code and see if I can understand the root cause.

Based on my experience with working with drag and drop images for the root medium-editor code I found that IE9 does not support the File API:

What this means for medium-editor is that when drop fires after dragging a file into the page, the native event.dataTransfer.files is undefined. For all other browsers supported by medium-editor, this mechanism can be used to grab the dragged file to embed it into the page. Thus, we don't support dragging images into medium-editor for IE9, and we don't currently have a workaround.

internet explorer 9 - medium-editor-insert-plugin: image upload not wo...

internet-explorer-9 jquery-file-upload xdomainrequest medium-editor jquery-iframe-transport
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I've come across this type of problem before when images uploaded to our site were JPEGs in CMYK format - Internet explorer would show them as a small red x, but Firefox would show them OK (definitely as of version 3, not sure about earlier releases).

Could you post the css rules for contextBlock, cntImg and clr? Another "funny" IE thing I've come across in the past is images disappearing behind a text block which has a css style that IE doesn't like, so I'm wondering if this might be applicable in your case.

internet explorer 7 - Images not rendering in IE7 (but working fine in...

image internet-explorer-7
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You seem to have a clising after inspecting your code it does not open up anywhere?

jquery - Image upload previewing not working and form submits only aft...

jquery internet-explorer submit
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FormData object is not supported in Internet Explorer until IE10. IE9 doesn't support FormData Object. So it wouldn't work with IE9 Check the supported browsers for FormData Object

If the browser doesn't support you can traverse the form dom elements and create a json object to set as $.ajax method data attribute value. If you are uploading any files take a look at Iframe Upload Solution

ajax - Image upload functionality is not working in internet explorer ...

ajax