Use Jquery To Replace Xmlhttprequest

I am quite new to JavaScript libraries. I wanted to replace my current code with jQuery. My current code looks like this: var req; function createRequest() { var key = document

Solution 1:

$.get(url, {}, callback);

should do the trick. Your callback could be simplified like this:

functioncallback(content){
    $('#decimal').val(content);
}

Or even shorter:

$.get(url, {}, function(content){
    $('#decimal').val(content);
});

And all in all I think this should work:

functioncreateRequest() {
    var keyValue = $('#key').val();
    $('#keypressed').val(keyValue);
    var url = "/My_Servlet/response";
    $.get(url, {key: keyValue}, function(content){
        $('#decimal').val(content);
    });
}

Solution 2:

Take out the readyState and status checks. jQuery only calls your callback upon success. Your callback is supplied the arguments (data, textStatus), so you should use data instead of req.responseText.

window.setTimeout() as suggested by another answer won't do what you want - that only waits and then calls your function once. You need to use window.setInterval() instead, which will call your function periodically until you cancel it.

So, in summary:

var interval = 500; /* Milliseconds between requests. */window.setInterval(function() {
    var val = $("#key").val();
    $("#keypressed").val(val);
    $.get("/My_Servlet/response", { "key": val }, function(data, textStatus) {
        $("#decimal").val(data);
    });
}), interval);

Solution 3:

I don't think jQuery implements a timeout function, but plain old javascript does it rather nicely :)

Solution 4:

According to the docs, jQuery.get's arguments are url, data, callback, not url, callback.

A call to JavaScript's setTimeout function at the end of your callback function should suffice to get this to continually execute.

Solution 5:

There's no need to set the GET parameters on the URL, jQuery will set them automatically. Try this code:

var key = document.getElementById("key");
[...]
var url = "/My_Servlet/response";
$.get (url, {'key': key}, function (responseText)
{
    var decimal = document.getElementById ('decimal'); 
    decimal.value = responseText;
});