How to Dynamically Update Bootstrap 4 File Input Labels?

Getting Started with Bootstrap 4 Bootbox

Understanding the Challenge

In Bootstrap 4, the custom file input component presents a constant "Choose file" label, regardless of file selection. To dynamically update this label with the chosen file's name, an understanding of JavaScript and CSS manipulation is essential.

The Bootstrap 4 File Input Solution

Version 4.5 and Above:

• Custom file input is no longer available. To customize the file button text, CSS or JavaScript must be employed.

Version 4.1 and Above:

• The placeholder text resides in the custom-file-label element.

• Set a custom label text via CSS:

  <code class="css">.custom-file-input ~ .custom-file-label::after {
    content: "Button Text";
  }</code>

Alternative for Bootstrap 4.1 and Above:

• Utilize a custom file input plugin, such as: https://www.codeply.com/go/uGJOpHUd8L/file-input

Original Solution for Bootstrap 4 Alpha 6:

Customizing Initial Placeholder and Button Text:

• Override the default placeholder and button text using CSS:

  <code class="css">#customFile .custom-file-control:lang(en)::after {
  content: "Select file...";
  }
  
  #customFile .custom-file-control:lang(en)::before {
  content: "Click me";
  }</code>

Retrieving Filename and Updating Input Value:

• Use JavaScript/jQuery to obtain the selected file's name:

  <code class="javascript">$('.custom-file-input').on('change', function() {
    var fileName = $(this).val();
  });</code>

• Hide the placeholder text when a file is chosen, using a CSS class:

  <code class="css">.custom-file-control.selected:lang(en)::after {
  content: "" !important;
  }</code>

• Toggle the CSS class on file selection and insert the filename into the form-control-file span:

  <code class="javascript">$('.custom-file-input').on('change', function() {
  var fileName = $(this).val();
  $(this).next('.form-control-file').addClass("selected").html(fileName);
  });</code>

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