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Web Development Articles
Found 8,008 articles
Difference between != and !== operator in JavaScript Program
In JavaScript, != and !== are both inequality operators, but they differ in how they compare values. != performs type coercion (converts types before comparing), while !== performs a strict comparison (checks both value and type without conversion). != (Loose Inequality) The != operator checks if two values are not equal after type conversion. It converts the operands to the same type before comparing their values. For example, 1 != '1' returns false because after converting the string '1' to number 1, both values are equal. !== (Strict Inequality) The !== operator checks if two values ...
Read MoreDifference between dot (.) and hash(# )selector in CSS
In CSS, the dot (.) and hash (#) selectors are used to apply styles to HTML elements. The dot selector targets elements by their class attribute, while the hash selector targets a specific element by its id attribute. Dot (.) Selector − Class Selector The . (dot) selector is a class-level selector. It creates a style class that can be applied to multiple HTML elements. Any element with the matching class attribute will receive the style. .blackBorder { border: 2px solid black; } This style applies to every element that ...
Read MoreDifference between :focus and :active selector in HTML
In CSS, :focus and :active are pseudo-class selectors that apply styles based on user interaction. They are commonly used on buttons, links, and form elements but trigger at different moments of interaction. :focus Selector The :focus selector applies styles when an element receives focus − either by clicking on it or navigating to it using the Tab key. The focus remains on the element until another element receives focus. This is commonly used on form inputs, buttons, and links. :active Selector The :active selector applies styles when an element is being actively pressed (mouse button is ...
Read MoreDifference between HTML and HTML 5
HTML (HyperText Markup Language) is a markup language used to define the structure of web pages using tags. HTML5 is the latest major version of HTML, introducing native support for audio, video, graphics, offline storage, and many new semantic elements that eliminate the need for third-party plugins like Flash. HTML (Older Versions) Earlier versions of HTML (HTML 4.01 and below) provided basic document structuring with tags for text, images, links, tables, and forms. They relied on external plugins (like Flash) for multimedia and had limited client-side storage (only cookies). The doctype declaration was long and complex. HTML5 ...
Read MoreDifferences between Bootstrap and JQuery UI
Both Bootstrap and jQuery UI are popular front-end tools used in web development. Bootstrap is a CSS framework focused on layout, design, and responsiveness. jQuery UI is a JavaScript library built on top of jQuery, focused on adding interactive widgets and effects to web pages. Bootstrap Bootstrap is a front-end CSS framework originally developed by Twitter. It provides pre-built CSS classes and components (grids, buttons, navbars, modals, etc.) for building responsive, mobile-first websites quickly. Bootstrap uses HTML, CSS, JavaScript, and preprocessors like LESS and SASS. Example The following example shows a responsive Bootstrap layout with a ...
Read MoreHow to check if onClick exists on element in jQuery?
In jQuery, you can check if an onClick event handler exists on an element by accessing the events data stored internally by jQuery. This is useful when you need to verify if event listeners are attached before adding or removing them. Checking for Click Events Using $.data() The most reliable way to check for existing click events is to use jQuery's $.data() method to access the events object. Here's how you can do it − Check onClick Events ...
Read MoreHow do I remove a property from a JavaScript object?
To remove a property from a JavaScript object, use the delete keyword. The delete operator removes a property from an object and returns true if the deletion was successful. Using the delete Operator The delete operator is the most common way to remove properties from JavaScript objects. Here's the basic syntax − delete objectName.propertyName; // or delete objectName['propertyName']; Example You can try to run the following code to learn how to remove a property − var cricketer = { name: "Amit", rank: 1, ...
Read MoreHow to check if event exists on element in jQuery?
To check if event exists on element in jQuery, you need to examine the existing events bound to that element. jQuery provides methods to access the event data stored internally for DOM elements. Here, I have set a div element − This is demo text. Click here! When you click the div, an alert is generated. To check if events exist on this element, we use $._data() method to access the internal event data and verify if any events are bound to the element. $("#demo").click(function() { alert("Does ...
Read MoreHow to enable and disable submit button using jQuery?
To enable and disable submit button, use the jQuery prop() method. The prop() method gets or sets properties and values of the selected elements. When used with the disabled property, it can control whether a button is clickable or not. Syntax Here's the basic syntax for enabling and disabling buttons − // To disable a button $(selector).prop('disabled', true); // To enable a button $(selector).prop('disabled', false); Example You can try to run the following code to enable and disable submit button using jQuery − ...
Read MoreCan I submit form with multiple submit buttons using jQuery?
Yes, you can submit forms with multiple submit buttons using jQuery. Attach a custom click handler to all the buttons and then check which button is clicked. When working with multiple submit buttons, you need to prevent the default form submission behavior and implement custom logic to determine which button was pressed. This allows you to perform different actions based on the specific button clicked. Example The following example demonstrates how to handle multiple submit buttons using jQuery − ...
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