Preview Image Before Upload in jQuery

Previewing the image before uploading provides an excellent user experience as it allows users to see which image they are about to upload. In this tutorial guide, you will learn how to preview or display an image before uploading it to the Server using jQuery.

Preview an image before uploading using jQuery

By using the following steps, you can display preview image before upload to server or directory using jQuery:

• Step 1: Create HTML Markup
• Step 2: Implement CSS Styling
• Step 3: Create jQuery Code to Show Preview of Image Before Upload

Step 1: Create HTML Markup

First, you need to create the HTML markup for our image upload form. You will add an input field of type “file”, and an empty image tag for displaying the preview of the uploaded image. The HTML markup should look something like this:

<input type="file" id="imageUpload" />
<div id="imagePreview"></div>

Step 2: Implement CSS Styling

Next, you need to add some CSS styling to our HTML markup to ensure that the preview image is displayed correctly. You will set the width and height of the image tag to 200 pixels, and add some padding and margin to make it look good. The CSS styling should look something like this:

#imagePreview {
  width: 200px;
  height: 200px;
  border: 1px solid #ccc;
  padding: 10px;
}
#imagePreview img {
  max-width: 100%;
  max-height: 100%;
}

Step 3: Create jQuery Code to Show Preview of Image Before Upload

Finally, you need to write some jQuery code to handle the image preview functionality. So, you can use the following jQuery code to show a preview of the image before uploading it to the server or directory:

$(document).ready(function() {
  $('#imageUpload').on('change', function(e) {
    var file = e.target.files[0];
    var reader = new FileReader();

    reader.onload = function(e) {
      $('#imagePreview').html('<img src="' + e.target.result + '" alt="Image Preview" />');
    }

    reader.readAsDataURL(file);
  });
});

Overall, this code demonstrates a simple and effective way to preview an image before it is uploaded using jQuery. It’s important to note that this code only handles client-side validation and that server-side validation should also be implemented to ensure the security and integrity of the uploaded files.

Conclusion

Previewing an image before it is uploaded is a useful feature for improving the user experience of your website or application. With jQuery, it’s easy to implement this functionality, by adding an event listener to the input field and creating a new FileReader object to read the contents of the selected file.

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