When switching from JavaScript to jQuery, the button values become invisible

Currently, I have a functional app that can dynamically change the values of buttons based on user input. The current implementation is in vanilla JavaScript within the script.js file. However, I am looking to enhance the functionality and user experience by transitioning to jQuery. Unfortunately, when I include the jQuery library and CSS file in the index.html, the buttons lose their values. I am struggling with completely converting the code to jQuery while maintaining its original functionality.

Here is a snippet from the existing JavaScript code (let me know if you need to see the entire script):

ajax_status.onreadystatechange = function() {

  if(ajax_status.readyState == 4 && ajax_status.status == 200) {

if(ajax_status.responseText == "ready_vid") {

  document.getElementById("video_button").disabled = false;
  document.getElementById("video_button").value = "record video start";
  // ... more button value assignments
}
else if(ajax_status.responseText == "ready_img") {
  document.getElementById("video_button").disabled = true;
  document.getElementById("video_button").value = "record video start";
  // ... more button value assignments
}

HTML in index.html:

<input id="video_button" type="button">
<input id="image_button" type="button">
<input id="timelapse_button" type="button">
<input id="md_button" type="button"><br>
<input id="halt_button" type="button">
<input id="mode_button" type="button">

In addition to the above code, there are other jQuery scripts included in the index.html file. The JavaScript code mentioned earlier resides in a separate file named script.js. My concern is whether I should also add the link for jQuery.js in the script.js file? And how should I handle the $(document).ready(function()? Should it also be included in the script.js file?

Answer №1

Here are some simple steps you can take for minimal changes:

  1. First, include the jQuery library in your

    <script type="text/javascript" src="static/jquery-1.10.2.min.js"></script>

  2. Next, replace any instances of document.getElementById('id') with $('#id').

    For example:

    • Instead of
      document.getElementById("video_button").disabled = false;
      , use
      $('#video_button').removeAttr('disabled');
    • Replace
      document.getElementById("video_button").value = "record video start";
      with
      $('#video_button').val('record video start');
    • Change
      document.getElementById("image_button").onclick = function() {send_cmd("im");};
      to
      $('#image_button').click(function() {send_cmd("im");});

Check out these references for more information:

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