check file extension and alert user if isn 27t image file js

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Thibaut
11 May 2017
1function fileValidation(){
2    var fileInput = document.getElementById('file');
3    var filePath = fileInput.value;
4    var allowedExtensions = /(\.jpg|\.jpeg|\.png|\.gif)$/i;
5    if(!allowedExtensions.exec(filePath)){
6        alert('Please upload file having extensions .jpeg/.jpg/.png/.gif only.');
7        fileInput.value = '';
8        return false;
9    }else{
10        //Image preview
11        if (fileInput.files && fileInput.files[0]) {
12            var reader = new FileReader();
13            reader.onload = function(e) {
14                document.getElementById('imagePreview').innerHTML = '<img src="'+e.target.result+'"/>';
15            };
16            reader.readAsDataURL(fileInput.files[0]);
17        }
18    }
19}
20
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