Use the Array.prototype.push method to append values to the end of an array: // initialize array var arr = [ “Hi”, “Hello”, “Bonjour” ]; // append new value to the array arr.push(“Hola”); console.log(arr); You can use the push() function to append more than one value to an array in a single call: // initialize array … Read more
If you are interested in finding out whether a variable has been declared regardless of its value, then using the in operator is the safest way to go. Consider this example: // global scope var theFu; // theFu has been declared, but its value is undefined typeof theFu; // “undefined” But this may not be … Read more
Looking at the Apple, Mozilla and Mozilla again documentation, the functionality seems to be limited to handle only string key/value pairs. A workaround can be to stringify your object before storing it, and later parse it when you retrieve it: var testObject = { ‘one’: 1, ‘two’: 2, ‘three’: 3 }; // Put the object … Read more
To get the value of the selected radioName item of a form with id myForm: $(‘input[name=radioName]:checked’, ‘#myForm’).val() Here’s an example: $(‘#myForm input’).on(‘change’, function() { alert($(‘input[name=radioName]:checked’, ‘#myForm’).val()); }); <script src=”https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js”></script> <form id=”myForm”> <fieldset> <legend>Choose radioName</legend> <label><input type=”radio” name=”radioName” value=”1″ /> 1</label> <br /> <label><input type=”radio” name=”radioName” value=”2″ /> 2</label> <br /> <label><input type=”radio” name=”radioName” value=”3″ /> … Read more
In JavaScript, everything is ‘truthy’ or ‘falsy’, and for numbers 0 means false, everything else true. So you could write: if ($(selector).length) You don’t need that >0 part.
ECMAScript 2018 Standard Method You would use object spread: let merged = {…obj1, …obj2}; merged is now the union of obj1 and obj2. Properties in obj2 will overwrite those in obj1. /** There’s no limit to the number of objects you can merge. * Later properties overwrite earlier properties with the same name. */ const … Read more
If I understood it right you are doing an XMLHttpRequest to a different domain than your page is on. So the browser is blocking it as it usually allows a request in the same origin for security reasons. You need to do something different when you want to do a cross-domain request. A tutorial about … Read more
Now on GitHub as a Plugin! Feel free to fork and improve. Demo | Download Zip | Half-Style.com (Redirects to GitHub) Pure CSS for a Single Character JavaScript used for automation across text or multiple characters Preserves Text Accessibility for screen readers for the blind or visually impaired Part 1: Basic Solution Demo: http://jsfiddle.net/arbel/pd9yB/1694/ This … Read more
With HTML5 you can make file uploads with Ajax and jQuery. Not only that, you can do file validations (name, size, and MIME type) or handle the progress event with the HTML5 progress tag (or a div). Recently I had to make a file uploader, but I didn’t want to use Flash nor Iframes or … Read more
Pretty-printing is implemented natively in JSON.stringify(). The third argument enables pretty printing and sets the spacing to use: var str = JSON.stringify(obj, null, 2); // spacing level = 2 If you need syntax highlighting, you might use some regex magic like so: function syntaxHighlight(json) { if (typeof json != ‘string’) { json = JSON.stringify(json, undefined, … Read more