Learn how to select the element which has the class name starting with number. HTML5 supports numbers as id and class name , but css selector have some rules , A valid name should start with a letter (a-z)[A-Z] , an underscore (_), or a hyphen (-) which is followed by any numbers, hyphens, underscores, letters. A name …
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Learn how to delete all the nodes inside a div or any node in Javascript. You can do it in three ways 1 . Set the node innerHTML as empty-string(“”). var node = document.getElementById(‘parent’); node.innerHTML = “”; This method removes all the text and nodes inside the parent node. If you need to delete only the …
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There are some things we don’t know about how the ! operator works in Javascript. Basics The ! is a logical operator that will convert a value to its opposite boolean. Since JavaScript will coerce values, it will “convert” a value to its truthy/falsey form and return the opposite boolean value. When we perform the ! operation on …
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Learn how to get the maximum of numbers. max function in the Math object can be used to find the maximum of multiple numbers and array. Math.max(1,2); //2 Math.max(1,2,3); //3 If any one of the argument passed cannot be converted to number then it returns NaN Math.max(‘1’, 0); //1 Math.max(‘one’, 1); // NaN Math.max(1, 2, …
Learn how to convert a multi-dimensional array into single dimension array in javascript We can flatten an array to single dimension array using Array.flat(depth) method. But if we have multi-dimensional array then we need to find the depth of the Array, instead of finding depth we can solve the problem in two ways we can …
Learn how to remove space in string. If you want to remove all the space in the string then , you can use replace method var name = “Javascript jeep “; name.replace(/s/g,”); // Javascriptjeep s –> spaceg –> replace globally We can also replace the space with ‘-‘ var name = “Javascript jeep “; name.replace(/s/g,’-‘); // …
Learn about how to parse boolean in Javascript. Creating a boolean value using Boolean constructor var b = new Boolean(); b is an object which have the value false in it. But the problem here is most of the beginner think as we can use directly in if , but it results to misunderstanding if(b) { …
Convert the 24 hours format time to 12 hours formatted time. You can get the time by , var dt = new Date(); var hours = dt.getHours(); // gives the value in 24 hours format var minutes = dt.getMinutes() ; var finalTime = “Time – ” + hours + “:” + minutes; finalTime // final time …
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Loader are the impressing part of the website , which needs to be simple and fun , So we will build an elegant loader . This loader is inspired from here. Create a container which is going to hold the loader <html> <body> <div class=”container”> </div> </body> </html> Set the width and height of the body to 100% , …
Learn about, in what way the string primitive and string objects are different in javascript. We can create string in three ways, 1. var a = “first way”; // we can also use single quotes 2. var b = String(“second way”); 3. var c = new String(“third way”); // also we can create using 4. …
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