Found 7686 Questions for Front End Technology

How to determine if JavaScript object is an event?

Shubham Vora
Updated on 23-Aug-2022 08:49:40
Let us first understand what is JavaScript objects and JavaScript events. An object in JavaScript is a distinct entity having properties and a type. For an instance, contrast it with a bowl. A bowl is an object with some properties. The properties are design, color, material, weight, etc. Like this, JavaScript object also has some properties. An independent entity known as a JavaScript object can store numerous values as its properties and methods. While a method represents a function, an object property maintains a literal value. Either the object literal or the object function object() { [native code] } syntax ... Read More

How to add a new row in a table using jQuery?

Kristi Castro
Updated on 20-Jun-2020 15:37:29
Use event delegations to include both add a new and delete a table row on a web page using jQuery.Firstly, set a button in HTML to add new row    Add new Row Now under the button click event, set the code:$("#newbtn").click(function () { }Example Live Demo    $(document).ready(function(){       var x = 1;       $("#newbtn").click(function () {          $("table tr:first").clone().find("input").each(function () {             $(this).val('').attr({                'id': function (_, id) {                 ... Read More

How to check whether a string contains a substring in jQuery?

Kristi Castro
Updated on 20-Jun-2020 15:56:41
The jQuery :contains() Selector is used to check whether a string contains a substring in jQuery.Set the substring you are searching for in the contains() method as shown below:$(document).ready(function(){    $("p:contains(Video)").css("background-color", "blue"); });Now, let us see the complete code to check whether a string contains a substring or not:Example Live Demo               $(document).ready(function(){          $("p:contains(Video)").css("background-color", "blue");       });     Tutorialspoint This is demo text. Free Tutorials Free Video Tutorials

How to make a textarea and input type read only using jQuery?

Kristi Castro
Updated on 20-Jun-2020 15:45:47
To make a textarea and input type read only, use the attr() method .For readonly, set the input type text and textarea as read only as shown below:$('input[type="text"], textarea').each(function(){    $(this).attr('readonly','readonly'); });The following is the code to set readonly to textarea and input type:Example Live Demo jQuery Example               $(document).ready(function() {          $('input[type="text"], textarea').each(function(){             $(this).attr('readonly','readonly');          });       });     readonly textarea

How to disable/ enable checkbox with jQuery?

Kristi Castro
Updated on 20-Jun-2020 15:45:00
fTo disable and enable checkbox, use the attr() method.Initially set the input type checkbox and disable it −MaleNow on the click of a button, toggle between disabled and enabled checkbox −$("#button1").click(function() {    $("#sName").attr('disabled', !$("#sName").attr('disabled')); });Example Live Demo jQuery Example               $(document).ready(function() {          $("#button1").click(function() {             $("#sName").attr('disabled', !$("#sName").attr('disabled'));          });       });     Male

How to disable/enable an input box with jQuery?

Arnab Chakraborty
Updated on 22-Jun-2020 07:59:30
We can easily disable input box(textbox,textarea) using disable attribute to “disabled”.$(‘elementname’).attr(‘disabled’,’disabled’);To enable disabled element we need to remove “disabled” attribute from this element.$(‘elementname’).removeAttr(‘disabled’);Example    ed                      $(document).ready(function () {             $('#btn1').click(function () {                $('input').attr('disabled', 'disabled');             });             $('#btn2').click(function () {                $('input').removeAttr('disabled');             });          });              Disable    Enable

How to use $.fadeTo() method to create animation in jQuery?

Alex Onsman
Updated on 22-Jun-2020 08:07:11
The fadeTo( ) method fades the opacity of all matched elements to a specified opacity and firing an optional callback after completion.Here is the description of all the parameters used by this method −speed - A string representing one of the three predefined speeds ("slow", "def", or "fast") or the number of milliseconds to run the animation (e.g. 1000).opacity − A number between 0 and 1 denoting the target opacity.callback − This is optional parameter representing a function to call once the animation is complete.You can try to run the following code to learn how to work with fadeTo() method ... Read More

What is the difference between jQuery.animate() and jQuery.hide()?

David Meador
Updated on 22-Jun-2020 08:05:11
jQuery animate()The animate( ) method performs a custom animation of a set of CSS properties.Here is the description of all the parameters used by this method −params − A map of CSS properties that the animation will move toward.duration − This is optional parameter representing how long the animation will run.easing − This is optional parameter representing which easing function to use for the transition.callback − This is optional parameter representing a function to call once the animation is complete.You can try to run the following code to learn how to work with jQuery animate() method:Example Live Demo   ... Read More

How can I make jQuery animations smoother?

Kristi Castro
Updated on 22-Jun-2020 08:44:07
To make jQuery animations smoother use the easing library. Use the animation speed properly to form it a perfect animation for the web page. Do not speed up animation and you should know where to stop it while using animate().For an example, set a button, that fades out on click and displays a textarea:Add answerThe following is the textarea that generates showing smoother animation using animation() and fadeout(): You can try to run the following code to make jQuery animation smoother:Example Live Demo               $(document).ready(function(){          $('body').on('click', '#answer', function() ... Read More

How to animate a change in background color using jQuery on mouseover?

Kristi Castro
Updated on 22-Jun-2020 08:41:49
To change background color, use the mouseenter event. The background color change when you place mouse cursor:mouseenter: function(){    $(this).css("background-color", "gray"); }The mouse cursor is placed on the following element:Click and move the mouse pointer to change the background color.You can try to run the following code to learn how to animate a change in background color on mouseover:Example Live Demo               $(document).ready(function(){          $("body").on({             mouseenter: function(){                $(this).css("background-color", "gray");             },                 mouseleave: function(){                $(this).css("background-color", "red");             },              });       });        Click and move the mouse pointer to change the background color.
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