What could be causing issues with my Ajax and JavaScript functionality?

While developing a website to search through my python database, I encountered an issue. The non-JavaScript version was functioning flawlessly. However, when attempting to implement AJAX so that the page would not have to be refreshed each time, I faced a problem - nothing happened upon clicking the search button. Can anyone help figure out why this is happening?

<script language="javascript">
var xmlhttp;
   if (window.XMLHttpRequest)
     {// code for IE7+, Firefox, Chrome, Opera, Safari
     xmlhttp=new XMLHttpRequest();}
   else
     {// code for IE6, IE5
     xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}

function getData(){
if(xmlhttp) {
var obj = document.getElementById("search-results");
xmlhttp.open("GET","http://127.0.0.1:8000/search/?name=i&city=o",true);
xmlhttp.onreadystatechange = function()  {
    if (xmlhttp.readyState == 4 &&
    xmlhttp.status == 200) {
    obj.innerHTML = xmlhttp.responseXML;
    }}
xmlhttp.send(null);
  }}
</script>
</head><body>
<form id="search-form" action="" method="get">
    <input type="text" name="name" id="name">
    <input type="text" name="city" id="city">
    <input type="button" value="Search" onclick = "getData()">
</form>     
<div id="search-results"></div></body>

Answer №1

One issue at hand is that your browser recognizes this as a cross domain request and automatically blocks it. To bypass this, you should utilize jsonp instead.

Visit here to learn more about jsonp

Check out this link for jquery jsonp

If you're looking for an example related to your specific problem, take a look at the following link: Click here to view the example (search for Same Origin Policy on the page)

In summary, here's what you need:

var url = "http://127.0.0.1:8000/search/?name=i&city=ocallback=jsonCallback";

var script = document.createElement("script");
  script.setAttribute("src", url);
  script.setAttribute("type", "text/javascript");

  window.jsonCallback = function(jsonObj) {

  document.body.removeChild(script);
  delete window[callback];
}

document.body.appendChild(script);

Answer №2

To prevent the default action from executing, consider using a return false statement within your event handler.

Answer №3

After making a couple of tweaks, I was able to get it up and running:

1) I switched from using xmlhttp.responseXML to xmlhttp.responseText, even though the file being fetched is in HTML. It made me wonder if it should be XML instead of TEXT.

2) Originally, the target element was a <div>. After changing it to a <p>, everything fell into place. Does innerHTML not function properly within a <div>?

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