jQuery.get()S2C Home « Ajax « jQuery.get()

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Asynchronous HTTP (Ajax) load request.

Description

The jQuery.get() Ajax method, allows us to load data from the server, using a HTTP GET request.

Shorthand version $.get()

• Browsers operate the 'same origin policy', which means a request can not successfully retrieve data from a different domain, subdomain, or protocol. jQuery 'Ajax' requests are subject to this security restriction, the exceptions being requests made with a datatype of 'script' or 'jsonp'.
• The jQuery.get() method returns a jqXHR object which is a superset of the browser's native XMLHttpRequest object. The jqXHR object implements the Promise interface, giving it all the properties, methods, and behavior of a Promise. See the lesson on the Deferred object for details of this. For standardization with the the Deferred object, the jqXHR object also provides done(), fail() and always() methods. These methods take a function argument that is called when the jQuery.get() request terminates and the function receives the same arguments as the same-named success(), error() and complete() setting callbacks respectively. This allows assignment of multiple callbacks for a single request as well as assigning callbacks after the request has completed. For completed requests, the callback is fired immediately.
  • It should be noted that the success(), error() and complete() callbacks of the jqXHR object are deprecated from use on request completion from jQuery 1.8 and removed in jQuery 3.0. This is for completion processing only and the Ajax settings will still have these values. Best practice is to use done(), fail() and always() methods on request completion to future proof code or use the new then() and catch() methods for Promises/A+ compliance.
• A jqXHR object will expose the following properties and methods for backward compatibility with the XMLHttpRequest object:

Syntax

Parameters

Return

A jqXHR object.

jQuery.get( url [, data] [, function(data,
            textStatus, jqXHR)] [, dataType] ) ExamplesTop

Load data from the server, using a HTTP GET request.

This is a shorthand Ajax function, which is equivalent to using the jQuery.ajax() method as follows:

$.ajax({
  url: url,
  dataType: dataType,
  data: data,
  success: callback
});

In the example below when we press the left button the first time we use the jQuery.get() method in its simplest form just using a url and output some messages dependant upon request success.

When we press the right button the first time we use the jQuery.get() method with a url and a success handler and output some messages dependant upon request success.

$(function(){
  $('#btn1').one('click', function(){
    $.get( "../js/get1.js" )
      .done(function() { $('#div1').append('Request succeeded! <br>'); })
      .fail(function() { $('#div1').append('Request failed! <br>'); })
      .always(function() { $('#div1').append('Request ended! <br><br>'); 
    });
  });
  $('#btn2').one('click', function(){
    $.get( "../js/get1.js", function(data, textStatus, jqXHR) {
       $('#div1').append('The request was a success! <br>');
    })
      .done(function() { $('#div1').append('Request succeeded! <br>'); })
      .fail(function() { $('#div1').append('Request failed! <br>'); })
      .always(function() { $('#div1').append('Request ended! <br><br>'); 
    });
  });
});

/*
 * The code for the external Javascript file called from $.ajax() (url: "../js/get1.js")
 * is shown below.
 */
$(function(){
  var someText = 'Passing some text. ';
  $('#div1').append('Message from get1.js: ' + someText + '<br>');
});

jQuery.get( settings ) ExamplesTop

Load data from the server using a HTTP GET request, passing some request settings.

This is a shorthand Ajax function, which is equivalent to using the jQuery.ajax() method as follows:

$.ajax({
  type: 'GET',
  url: url,
  dataType: dataType,
  error: callback
  success: callback
});

In the example below when we press the left button the first time we use the jQuery.get() using a url, dataType and error and success parameters and output a fail messages as the url doesn't exist.

In the example below when we press the right button the first time we use the jQuery.get() using a url, dataType and error and success parameters and output a success message and the contents of the retrieved url.

$(function(){
  $('#btn10').one('click', function(){
    $.get({
      url: "../js/get22.js",
      dataType: "script",
      error: function() { 
        $('#div2').append('The request failed! <br><br>');
      },
      success: function() { 
        $('#div2').append('The request was a sucesss! <br><br>');
      }
    });
  });

  $('#btn11').one('click', function(){
    $.get({
      url: "../js/get2.js",
      dataType: "script",
      error: function() { 
        $('#div2').append('The request failed! <br><br>');
      },
      success: function() { 
        $('#div2').append('The request was a sucesss! <br><br>');
      }
    });
  });


/*
 * The code for the external Javascript file called from $.ajax() (url: "/../js/get2.js")
 * is shown below.
 */
$(function(){
  var someText = 'Passing some text. ';
  $('#div2').append('Message from get2.js: ' + someText + '<br>');
});

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