Category Archives: jquery

Struts 2 action called up twice.

Problem :

If you are using JSON plugin with struts2 then you might end up with this problem. your action get called up twice even when you have define it only once and you are firing ajax only at once.


Solution:

This is happening because JSON plugin is calling all your methods that start with “get” in an attempt to serialize them for output.Try to rename the method name other then “getxxxxx()”.



method name start with getXX:
public String getName() {
return "Rakesh";
}


method name changed to fetchXX:

public String fetchName() {
return "Rakesh";
}


Hopefully this will work.

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Call ajax after completion of another ajax ,Wait for ajax to return.

Lets suppose you are trying to set loggedIn username to the header of your web page and you have 2 ajax which get fired

1st Ajax : Which is decorating the header

2nd Ajax : Which gets the username

So if 2nd AJAX become first in the race then username is not visible to you as 1st ajax is responsible for decorating the header and if there is no header there is no place where you can set header.

so to be very sure that our username is visible on the screen, we should wait for the header(1st ajax)to complete


document ready function:

$(document).ready(function () {

//calling this method to get the fetch logged in user

fetchloggeInUser();

});




1st Ajax request : run in parallel with 2nd ajax 

this is building our header part
(function ($) {
$.pageDecorate = {
//declare a global variable so that it can be used.
decorateDeferred : null,
//set response of the ajax in a variable
var decoratorDeferred = $.ajax({
url : 'setHeader',
type : 'get',
data : decorateHeaderData,
dataType : 'json',
success : function (data) {
//response of testAjax sets in decorateDeferred
decorateDeferred = $.pageDecorate.testAjax();
}
});


Global declaration :

  //set value of global variable decorateDeferred so
  // that it can be use as a reference

$.pageDecorate.decorateDeferred = decorateDeferred;


},


Method to call :
 testAjax : function () {

  var navHtml = '<ul>';
navHtml += '<div class="divHeader" title="login">';
navHtml += '<div class="role">';
navHtml += '</div>';
navHtml += '</div>';
navHtml += '</ul>';
//append this to header of your page
$('.header').append(navHtml);
}
});


2nd Ajax:

fetchloggeInUser : function () {

$.ajax({

url : "loggedInUser",

type : "POST",

success : function (data) {

//although this success block call when ajax get
   //fired but this code runs when it get response
//after the success response of $.pageDecorate.decorateDeferred
   this below success get called

$.pageDecorate.decorateDeferred.success(function () {

$('.divHeader').find('.role').text(userName);

});

}

});

}



That ‘s it you are done.

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Simple ajax call Jquery

This is plain Ajax call with success and error function.

you can write this ajax in any of your method and perform actions.



Code:
/* get some values from elements on the page: */

var username= $('#username').val();
var pass=$('#pass').val();
//parameters to pass
var data = {
username : username,
pass:pass
};
//authenticateUser is the action which you need to call
var testUrl = "authenticateUser";
$.ajax({
url : testUrl,
type : 'post',
data : data,
dataType : 'json',
success : function(data) {
//success action Block
alert("Login success");
},
error:function(){
//Error action block
alert("Login failed");
}
});

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