Send input values to a JavaScript function from an onchange event

I'm facing an issue with using AJAX to update a section of my website when the drop-down box is changed. The problem I am encountering is passing the parameters correctly to the function.

Below is the HTML code:

<script type='text/javascript' src='ajax.js'></script> //Location of the function

<div id="combobox" style="width: 150px; height: 300px; overflow-y: scroll">
  <select onchange="MakeRequest(test); location = this.options[this.selectedIndex].value;"> 
    <option>Races</option>

    <?php ComboBox() ?>
  </select>
   .
   .

Here is the AJAX function located in an external file, ajax.js:

function MakeRequest(test) {
  var linkInfo = "teleport.php?call=" + test;
  var xmlHttp = getXMLHttp();

  xmlHttp.onreadystatechange = function() {
    if (xmlHttp.readyState == 4) {
      HandleResponse(xmlHttp.responseText);
    }
  }

  xmlHttp.open("GET", linkInfo, true);
  xmlHttp.send(null);
}

Can anyone provide guidance on how to resolve this issue?

javascriptajax

Answer №1

newLocation=this.options[this.selectedIndex].value

This code snippet is updating the page to a new location. This method does not use AJAX, so it should be omitted.

Instead of using 

this.options[this.selectedIndex].value
(or simply this.value - which is equivalent), replace it with test.

Answer №2

The beauty of Ajax lies in its asynchronous nature. It seems like the goal here is to initiate an AJAX request to the server first, followed by redirecting the user to a different page on the client side based on the response received.

In your current code, the MakeRequest() function is invoked initially, but due to the asynchronous nature of Ajax, it quickly returns control. Consequently, the subsequent part of the onchange attribute is executed, leading to the redirection of the user to another page.

To confirm this behavior, try making your ajax call synchronous instead. You can find more information about synchronous Ajax calls here.

Answer №3

<select onchange="SubmitForm(this.value); " />

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