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Javascript Articles
Page 525 of 534
How to find whether a browser supports JavaScript or not?
To find whether the browser supports JavaScript or nor, use the tag. The HTML tag is used to handle the browsers, which do recognize tag but do not support scripting. This tag is used to display an alternate text message.Here’s an example, HTML noscript Tag Your browser does not support JavaScript!
Read MoreShould I include language="javascript" in my SCRIPT tags?
The language attribute in JavaScript is optional since the introduction of HTML5 brought some new improvements. JavaScript became the default language for HTML5 and modern browsers. Therefore, now adding javascript isn’t required in tag.This attribute specifies what scripting language you are using. Typically, its value will be javascript. Although recent versions of HTML (and XHTML, its successor) have phased out the use of this attribute.Here you can see how it is used:
Read MoreWhat does the leading semicolon in JavaScript libraries do?
A function in JavaScript looks like the following:(function(){...})()A library in JavaScript shows a function, which begins with a semicolon, for example:;(function ) { }The semicolon allows to safely concatenate several JS files into one. This is to serve it faster as one HTTP request.A leading semicolon can also be to protect from preceding code, which may have been improperly closed. A semicolon will definitely prevent this from happening.
Read MoreHow I can show JavaScript alert box in the middle of the screen?
To show the JavaScript alert box in the middle, you need to use the custom alert box. Under that, style it accordingly and position it to the center. Use the "top" and "left" CSS properties to achieve this. Set them as 50%, but as you can see a button below, use the property to 40% to align it with the button: Example function functionAlert(msg, myYes) { var confirmBox = $("#confirm"); confirmBox.find(".message").text(msg); confirmBox.find(".yes").unbind().click(function() { confirmBox.hide(); }); confirmBox.find(".yes").click(myYes); confirmBox.show(); } #confirm { display: none; background-color: #F3F5F6; color: #000000; border: 1px solid #aaa; position: ...
Read MoreHow to allocate memory in Javascript?
Regardless of the programming language, memory life cycle is pretty much always the same −Allocate the memory you needUse the allocated memory (read, write)Release the allocated memory when it is not needed anymoreThe second part is explicit in all languages. Use of allocated memory needs to be done by the developer.The first and last parts are explicit in low-level languages like C but are mostly implicit in high-level languages like JavaScript.Hence there is no explicit way to allocate or free up memory in JavaScript. Just initializing objects allocates memory for them. When the variable goes out of scope, it is ...
Read MoreExplain the event flow process in Javascript
In the JavaScript, Event Flow process is completed by three concepts −Event Target − The actual DOM object on which the event occured.Event Bubbling − Explained belowEvent Capturing − Explained belowEvent bubbling is the order in which event handlers are called when one element is nested inside a second element, and both elements have registered a listener for the same event (a click, for example). With bubbling, the event is first captured and handled by the innermost element and then propagated to outer elements.With capturing, the event is first captured by the outermost element and propagated to the inner elements.Let's ...
Read MoreHow to create a custom object in JavaScript?
To create a custom object in JavaScript, try the following code Example var dept = new Object(); dept.employee = "Amit"; dept.department = "Technical"; dept.technology = "Java"; document.getElementById("test").innerHTML = dept.employee + " is working on " + dept.technology + " technology.";
Read MoreHow to use OR condition in a JavaScript IF statement?
To use OR condition in JavaScript IF statement, use the || operator i.e Logical OR operator. If any of the two operands are non-zero, then the condition becomes true. Here's how you can use the operator || in JavaScript Example var a = true; var b = false; document.write("(a || b) => "); result = (a || b); document.write(result);
Read MoreHow to convert a string to camel case in JavaScript?
Camel case is the practice of writing phrases such that each word or abbreviation in the middle of the phrase begins with a capital letter, with no intervening spaces or punctuation. For example, Concurrent hash maps in camel case would be written as −ConcurrentHashMapsWe can implement a method to accept a string in JavaScript to convert it to camel case in the following way −Examplefunction camelize(str) { // Split the string at all space characters return str.split(' ') // get rid of any extra spaces using trim .map(a => a.trim()) ...
Read MoreWhat is the difference between == and === in JavaScript?
Double equals (==) is abstract equality comparison operator, which transforms the operands to the same type before making the comparison. For example,4 == 4 // true '4' == 4 //true 4 == '4' // true 0 == false // trueTriple equals (===) are strict equality comparison operator, which returns false for different types and different content.For example,4 === 4 // true 4 === '4' // false var v1 = {'value':'key'}; var v2 = {'value': 'key'}; v1 === v2 //false
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