Thursday, 1 December 2016

Latest jQuery interview questions and answers for freshers and experienced

                Hi friends in this article I will explain about Latest jQuery interview questions and answers for freshers and experienced.The below questions and answers will help in interview.

What is JQuery?
Jquery is a fast,cross-browser lightweight "write less, do more", JavaScript library. JQuery also simplifies a lot of the complicated things from JavaScript, like AJAX calls and DOM manipulation.

Difference between $(document).ready() and $(window).load
1.we can can more than one $(document).ready() but we can use only one $(window).load
2.document.ready() function is called as soon as DOM is loaded where body.onload() function is called when everything gets loaded on the page that includes DOM, images and all associated resources of the page.

What is JQuery.noConflict?
As other client side libraries like MooTools, Prototype can be used with jQuery and they also use $() as their global function and to define variables. This situation creates conflict as $() is used by jQuery and other library as their global function. To overcome from such situations, jQuery has introduced jQuery.noConflict().
When we use jQuery noConflict mode, we are replacing the $ to a new variable and assigning to jQuery some other JavaScript libraries
You can of course still use jQuery, simply by writing the full name instead of the shortcut
var jnc = $.noConflict();
jnc(document).ready(function(){
   jnc("button").click(function(){
        jnc("p").text("using this also jQuery is working!");
    });
});

What is a CDN?
content delivery network or content distribution network (CDN) is a large distributed system of servers deployed in multiple data centers across the Internet. The goal of a CDN is to serve content to end-users with high availability and high performance.

What is the use of jQuery .each() function?
The each() method specifies a function to run for each matched element.
Example:
 $(document).ready(function() {
 //for radiobuttonlist checking.
                $('.rbl').each(function() {
                    var checked = $(this).find('input:radio:checked');
                    if (checked.length == 0) {
                        alert("pls select atleast one radio button");
                        return;
                    }
                    else {
                        if (checked.val() == 1) { alert("checked 1"); }
                        if (checked.val() == 2) { alert("checked 2"); }
                        if (checked.val() == 3) { alert("checked 3"); }

                    }
                });

What is difference between prop and attr?
attr() gives you the value of element as it was defines in the html on page load. It is always recommended to use prop() to get values of elements which is modified via javascript/jquery , as it gives you the original value of an element's current state.
<input type="text" value="txt" id="test"/>
$('#tbl1').change(function(){
    alert('attr(): '+$(this).attr('value'));  //shows txt
    alert('prop(): '+$(this).prop('value')); //shows the textbox's new  value
});

  
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