Here is the example to validate the file extension and size before upload. Regular expression has been used to validate the file extension. And to validate file size, we use size property of file input i.e., img.files[0].size. Onclick event of button, validate() function is being called. First, it checks for file extensions (jpg, jpeg, png, etc) and give error message for the files having other extensions. Then, it validates the file size by calculating the file size using img.files[0].size.
Example:
- <html>
- <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
- <script type="text/javascript">
- function Validate()
- {
- var image =document.getElementById("image").value;
- if(image!='')
- {
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