window.event javascript code does not work in Firefox

Question

I have an markup

            

                    Choose Fil         


        
                      

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Answer 1

Firefox doesn't support windows.event object. Use these variables to store the value and it will work after that use your code:

var event = e || window.event
var assumed = (event.target || event.srcElement).id;

Answer 2

try this:

Tested and 100% working

You can Combine here event and this(element)

function postBackByObject(e,d) {
            var target = e.target || e.srcElement;     // Support IE6-8

            if (d.id == 'uploadControl') {

                document.getElementById('labelId').click();
            }
            target.cancelBubble = true;
        }


<div id="uploadControl" class="fileUpload1" 
 onclick="postBackByObject(event,this);">
<label for="uploadFile" id="labelId">Choose File</label>
<input class="upload" type="file" id="uploadFile" />
                </div>