Front End Technology Articles - Page 738 of 745

To fetch the nth div from an HTML page, use the jQuery eq() method. It is used to access the index of an element in jQuery. The eq() method refers the position of the element.ExampleYou can try to run the following code to learn how to fetch nth div from an HTML page using jQuery. Here, we will fetch the 2nd div:Live Demo $(document).ready(function(){   $("#button1").click(function(){     alert($("div:eq(1)").text());   }); }); Paragraph One Paragraph Two - 2nd div selected Paragraph Three Which div?

Here’s how you can get objects by ID Selector (#id), by Class Selector (.class), by Tag, and Attribute (.attr()).Get Object by Class SelectorExampleThe element class selector selects all the elements which match with the given class of the elements.Live Demo           jQuery Selector                          $(document).ready(function() {                 $(".big").css("background-color", "yellow");          });                                  This is first ... Read More

To escape square brackets in jQuery selectors is quite easy. Let’s see with an example of escaping the brackets in the name of the box.ExampleWhatever you will select, will get added to the textarea on button click.Live Demo $(document).ready(function() {     $("#addnow").click(function () {        $("#myselect :selected").each(function () {           $("#text").val($("#text").val() + $(this).text() + "");        });     }); });     email@example.com     David Select and Click to Add

ExampleYou can try to run the following code to write a jQuery selector to find links with # in href. Here,^ is used to find links starting with # in href.Live Demo $(document).ready(function(){    $('a[href^="#"]').click(function(){       alert('Success! Selected link starting with # in href.');    }); }); Demo C++

It’s quite easy to use JavaScript variables in jQuery selectors.ExampleLet’s seen an example to use JavaScript variables in jQuery to hide an element:Live Demo $(document).ready(function(){    $("input").click(function(){         var name = this.name;       $("input[name=" + name + "]").hide();     } );     }); Heading 1 To hide the buttons, click on it.

The $ variable is for jQuery.  If you’re using more than one JavaScript library or multiple versions of jQuery, then you should use jQuery(selector) instead of $(selector) to avoid name conflicts.ExampleTo understand the noConflict() concept, let us see an example of using the jQuery (selector):Live Demo $.noConflict(); jQuery(document).ready(function(){     jQuery("button").click(function(){         jQuery("h3").text("jQuery works perfectly");     }); }); Testing jQuery Click below: Click me The $ sign is used for jQuery, but what if other frameworks also use the same $ sign; this may create issues and ... Read More

The children( [selector] ) method gets a set of elements containing all of the unique immediate children of each of the matched set of elements.ExampleYou can try to run the following code to learn how to get a set of elements containing all of the unique immediate children of each of the matched set of elements:Live Demo           jQuery Example                              $(document).ready(function(){             $("div").children(".selected").addClass("blue");          });           ... Read More

The find( selector ) method can be used to locate all the descendant elements of a particular type of elements. The selector can be written using any selector syntax.ExampleYou can try to run the following code to learn how to locate all the descendant elements of a particular type of elements:Live Demo           jQuery Example                              $(document).ready(function() {             $("p").find("span").addClass("selected");          });                              .selected {            color:blue;          }                         This is first paragraph and THIS IS BLUE       This is second paragraph and THIS IS ALSO BLUE        

To exclude first and second element from jQuery, use the slice() method.ExampleYou can try to run the following code to exclude first and element from jQuery:Live Demo $(document).ready(function(){    $('p').slice(2).css('font-size', '24px'); }); Java C++ Ruby Groovy

To enhance the performance of jQuery selector, you need to perform optimization. Here are some of the techniques:Cache SelectorCaching enhances the performance of the application. Cache your jQuery selectors for better performance. This can be done using the ID as your selector. For example, this caches the selector and stores it in variable.var $elm = $("#elm");Instead of using the jQuery ID selector, use the $elm variable:var $elm = $("#elm"); $elm.addClass(‘example’);Use ID selectorjQuery is a JavaScript library. In JavaScript, document.getElementById() is used to select the HTML element, which is the fastest way. Since jQuery is written on top of JavaScript, it ... Read More