hi friends

how to check file upload control empty or not in javascript?

I m try to this way but it is not working

function Empty(){

var sValue.value = document.getElementById('file_input');

if(sValue == ""){
	alert("ERROR: Project Image Should be Uplorded..!.");


<input type="file" name="fileField" id="file_input" >
<input  type="button"  value="Send" name="Submit"  onclick="Empty()/>

thank you...

function Empty() {
    var element = document.getElementById('file_input');
    var sValue = element.value;
    if (sValue == "") {
        alert("ERROR: Project Image Should be Uploaded!");
        return false;
    return true;
<input type="file" name="fileField" id="file_input" />
<input type="submit" value="Send" name="Submit" onclick="return Empty();" />
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