"Regarding compatibility with different browsers - IE8, Firefox3.6, and Chrome: An inquiry on

Snippet of JavaScript Code: 

var httprequest = new XMLHttpRequest();
var time = new Date();
if (httprequest) {
  httprequest.onreadystatechange = function () {
    if (httprequest.readyState == 4) {
      alert("OK");
    }
  };
  httprequest.open("GET", "http://www.google.com", false);
  httprequest.send(null);
}
alert(new Date() - time);

When tested on different browsers:

  • IE8: Displays OK and time dialog.
  • Chrome10: OK dialog shown, but time dialog is not prompted.
  • Firefox3.6: OK message displayed without the time dialog.

Why are some dialogs not being prompted?

javascriptajax

Answer №1

When you use httprequest.send(null) in your situation, it causes the JavaScript code to block and prevents anything after that line from executing. The reason for this behavior is unclear, but it could be due to the implementation specifics of a particular browser or some other factor.

To resolve this issue, you should run the request asynchronously by setting the third parameter of the "open" method to "true":

httprequest.open("GET", "http://www.google.com", true);

If you are looking to work with AJAX, consider utilizing a JavaScript framework like jQuery. These frameworks simplify development tasks for JavaScript developers by offering browser-neutral methods for working with the DOM, handling events, making AJAX requests, and more.

Answer №2

Hello there, Maxima! I wanted to let you know that your code looks good and I also appreciate Andrey's answer. However, I have 2 notes for you:

1- Remember that XMLHttpRequest cannot make requests outside of your domain. If you need to request a page from a different domain, it's best to do it server-side.

2- Regarding Andrey's suggestion to switch to jQuery, I respectfully disagree. It's important to first master JavaScript before diving into libraries like jQuery. Make sure you understand how JavaScript works before relying on any library.

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