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JS function to check the extension of file in the url

Javascript function to check the extension of file in the url. This is useful for setting filters for file control. the function and it sample use is given below:

function checkFileType(str){
file_name=str.replace(/^.*(\\|\/|\:)/, '');
if( ext!= 'doc' && ext!= 'jpg' && ext!= 'jpeg' && ext!= 'png' && ext!= 'gif' && ext!= 'pdf'){
alert("Selected file "+file_name+" is invalid, Please upload file of type doc,jpg,jpeg,pdf,gif or png. ");

Sample usage

<input id="file" name="file" onchange="javascript:checkFileType(this.value);" type="file" />


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