How Can I Access AJAX Response Text Using Prototype's `onComplete` Handler?

Getting AJAX Response Text in Prototype

AJAX responses are often in text format, and retrieving this text is crucial for further processing. Prototype provides a convenient way to access this response text, but it requires a slight adjustment to the usual approach.

In the code snippet, the onComplete event handler is where the response text should be obtained. However, the "result" variable in the initial implementation is not accessible outside the onComplete function due to asynchronous operations.

To overcome this, Prototype's onComplete handler allows for a callback function as a parameter. This callback function is executed when the AJAX request is complete, and it can receive the responseText as an argument.

Here's the modified code:

somefunction: function(callback) {
  var result = "";
  myAjax = new Ajax.Request(postUrl, {
    method: 'post',
    postBody: postData,
    contentType: 'application/x-www-form-urlencoded',
    onComplete: function (transport) {
      if (200 == transport.status) {
        result = transport.responseText;
        callback(result);
      }
    }
  });
}

When calling somefunction, provide the callback function as an anonymous function:

somefunction(function (result) {
  alert(result);
});

This approach ensures that the response text is accessible in the callback function, allowing for further processing or display.

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