javascript preview image before upload w3schools code example
Example 1: File Upload Button and display file javascript
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<label for="file-upload" class="custom-file-upload">
<i class="fa fa-cloud-upload"></i> Upload Image
</label>
<input id="file-upload" name='upload_cont_img' type="file" style="display:none;">
</form>
Example 2: File Upload Button and display file javascript
.custom-file-upload {
border: 1px solid #ccc;
display: inline-block;
padding: 6px 12px;
cursor: pointer;
}