1. What is Jquery ?
Answer: Jquery is JavaScript Library whose main moto is to simplifiy the use of java script for a html document.
It is a light weight JavaScript Library that emphasis intraction between JavaScript & Html.
It simplify traversing ,event handling , animation and ajax.
2. How it Works ?
Answer: To Work with Jquery you have to copy the Jquery Js file in your project.
And refrence in your page like <--
script type="text/javascript"
src="jquery.js" --
>
And you can use it. Second point is that you have to start Jquery in $(document).ready event
And all the event will comes under this ready event.
3. Necessary component to work with Asp.net + Jquery?
Answer: For Jquery in Asp.net you need to have to copy two files in your Project and refrence in your project jquery-1.2.6-vsdoc.js & Jquery1.2.6.js
4. Traversing
Ans:
1) you can find particular element in below type
$("#elementId) -- Suppose there a div box with id dvTest <
div id="dvTest"
--> then we have to use $("#dvTest")
$("element"), -- Suppose there div box in page then if we want to change all the div box background color then we can find all the div with $("div")
$("element").eq(index) -- Now if we want to change the background of of first div only then $("div").eq(1) here eq(1) change the background color of index 1 div
$("element").find() -- Search all the element that match with particular expression like $("div").find("p") here we find all the p which are in div tag
$("element").contnent()- it work same as find
$("element").next() - will find next sibling after element.
$("element").nextAll() - wiil find all next sibling after element but not there child element.
$("element").length() - determine number of element in document
$("element").parent.get(0)- will return the parent of element….
$("element").prev ;- get the privious sibling of each of element...
5. Effects :-
Ans:
Jquery makes it easy to show effects now we don't have to write lot of code for some specific animation here are some example.
$("element").toggle(function1,function2) :- By the name its clear that it will toggle the event which we can use in showing different effects.
Ex- if we want to do colour change of div on different click then we do following code
$("#divtest").toggle(function() { $("divtest").css("background-color", "red");}, function ("divtest").css("background-color","blue");});
in the simillar manner we can do different thing also.
$("element").hover(function):- for hover effect.
$("element").FadeIn(intAmount) :- for fade in effect.
$("element").FadeOut(intAmount):- for fade out effect.
$("element").hide(intAmount) :- for hide effect.
$("element").show(intAmount) :- for show effect.
$("element").animate() :- for animation effect we have animate function
for example lets see below example $("#btnFade").click(function() { $("#dvTest").animate({ "left": "+=50px" }, "slow"); });
It will increase left of div test by 50px with slow speed.
$("element").slideToggle() :- it will move up or down according to last action did by element for example.
$("#btnOpen").click(function() {
$("#dvTest").slideToggle('slow', animate());
function animate() {
}
});
The above button click wiill slide up or down with slow speed.
$("element").slideUp(speeed) :- it will slide up the element with desire speed.
$("element").slideDown(speed) :- it will slide down the element with desire speed.
$("element").fadeTo(speed,opacity):- the extra element is opacity means we can define opacity also with speed for particular element fade effect.
$("element").Stop() :- it will stop all the animation running on the element.
7. Events
Ans: Jquery event system is normalize the event object.Then event object is guranteed to be passed in event handler.
Here is more description
1) event.type :- Determine the nature of event.
Ex:- $(a).click(function(event) { alert(event.type);}); it will return "click"
2) event.target:- Give the refrence of DOM element which raised the event.
EX:- $(a).click(function(event){alert(event.target.href);});
Return the url which is assign to a for href property.
3)event.pageX/pageY: - return the mouse position (cordinate) relative to the document.
Ex:- $(a).click(function (event){ alert(event.PageX); alert(event.PageY); });
4) event.preventDefault() :-
it will stop the default exceution action.
EX:- $(a).click(function(event) { event.preventDefault(); alert('test');}); stop the a href ( transfer to another page)
The above are the basic for event object.
5) ready :- On of the most and basic event for Jquery is ready().
It bind the function to be executed when ever the document is ready for traverse and mainupulate.
Its base of jquery it improve web performance as well.
You many have as many as ready event in your web form. It will execute in the order as you define the events. It’s a solid replacment of window.load()
6) Bind() :- Suppose you have more than one paragraph and you want same event on each paragraph then instead of writing each paragraph event.you can bind paragraph with particular event.
Ex:- $("p").bind("onmouseover", function (){ $(this).css("background- color","red");});
7)One() :- suppose we want a event only once on the document then we can bind the event by one.
Then it will run only once on the particular event.
Ex:- suppose we want click event only once on all the div then
$("div").one("click",function() { ($(this).css("background-color", "blue"); });
8) unbind() :- it will just do upposit the bind event.it unbind all the event for match element.
9) blur() :-
trigger blur event on each matched element. Or in other word we can say when focus is lost from the element then this event run.
Ex:- $("txtName").blur(function() { $(this).css("border","2px");});
9) change():- Change event fire when element's value has been modified.
Ex:- $("txtName").change(function() { alert($("txtName").text();});
There are many more events which is as follow click(),
dblClick(),error(),focus(),KeyDown(),KeyPress(), keyUp(),Load(),mouseout(),mouseover(),mouseup(),mousedown(),resize(),Scroll(),
select(),Submit(),unload().
9. Ajax Functionality
Ans:
Jquery is giving many function for using ajax which help to use ajax functionality easy. Here we goes with detail
$.ajax (s) :- its first and basic function for using ajax by Jquery.
Where s I can it collection of different properties which is enclosed in curly brackets "{ }"
1) $.ajax( {type : " GET/POST",
url : " any url" ,
data : "data1=rajat& data2=test", ( any data which you want to pass to the server…)
Success: function () {} , (any operation after successful readystate= 4)
cache : "TRUE/FALSE" ,
});
Ex:- To pass data from client to server we use following example
$.ajax({
type: "POST",
url: "SaveUser.aspx",
data: "name=RAJAT&Surname=JAISWAL",
success: function(msg){
alert( "Data Saved: " + msg );
}
} );
2)load(url) :- by the name it is clear that it will load html of a remote file and inject in current calling element.
Ex:- $("#dvResult").load("htmlPage1.htm");
it will load htmlPage1.htm 's html in div part
3) $.get(url) :- Simplest form to use http get request is $.get which is jquery.get(). We can send data along with this also which is optional part.
EX:- $("save.aspx",{name:"RAJAT", surname:"JAISWAL"});
suppose if want to take back result from Response. Then it has following format $("save.aspx",{name:"RAJAT", surname: "JAISWAL"} , function(data) { alert('do operation' + data);});
4)$.getJASON(url,data,function) :- To get response in json format we use this fuction its same as $get the diffrence here is only one that its respond in Json.
Ex- suppose from server the data return in json format which is { "info":[{ "strFirstName" :"Rajat" , "strLastName" : "Jaiswal"}]}
Then we do below code $.getJSON("default.aspx", function(data) { alert(data.info[0].strFirstName + data.info[0].strLastName); });
5) $.post(url,data,function):- it same as get method just a diffrence that it use post method to send data.
Ex:- $.post("save.aspx");
for more information just visit
http://indiandotnet.wordpress.com/tag/jquery/
Thanks
Rajat Jaiswal
