Javascript Articles - Page 564 of 671

HTML contains special characters such as ‘, ’ ‘/, ’ and many more such as single and double commas. These special characters are used for the HTML tag, such as ‘’ is used to close the HTML tag. This tutorial teaches us to escape HTML special characters in JavaScript.Now, the question is that what if we want to use these characters inside the HTML content? If we use special characters normally in the HTML content, it considers it the opening or closing HTML tag and produces an unknown error.For example, we need to render the below string to the browser. ... Read More

The isNaN() function in JavaScript is used to check whether a given value is NaN. This function converts the argument to a number first, then checks if it's NaN. When you pass null to isNaN(), it returns false, which can be surprising. This happens because of JavaScript type coercion when using isNaN(). In this article, we will understand why isNaN returns false for null. Understanding isNaN and Type Coercion in Js Before moving forward in this article you need to understand the following key concepts of this article: isNaN in Js: The isNaN() function ... Read More

Try any of the following for the width of the image you want to create −myImg.setAttribute('width', '5px');OrmyImg.width = '5';OrmyImg.style.width = '5px';You can also try the following code to add the width and height to the background image −var myImg = new Image(5,5); myImg.src = 'http://www.example.com';

Yes, use new RegExp(pattern, flags) to achieve this in JavaScript.You can try to run the following code to implement JavaScript regex using string variables −                    var str = 'HelloWorld'.replace( new RegExp('hello', 'i'), '' );          document.write(str);          

In this tutorial, we will learn how to return the color of the text with JavaScript. In the Style (It is a rule of HTML, used to describe how a document will be presented in the browser.) we define the color under that rule of HTML. To return the color of the text in JavaScript, we have to use the color property of JavaScript. The Colour property is used for assigning the color of the text inside the HTML tags (like p, h1, h2, body, etc.), and with the help of the id of the tag we can return the ... Read More

To get only the else part, just negate, using ! the operator in JavaScript. You can try to run the following code to achieve this −var arr = {}; if (!(id in arr)) { } else { }In addition, if you want the existence of a property in an object, then use hasOwnProperty −if (!arr.hasOwnProperty(id)) { } else { }

To create a syntax-highlighting code with JavaScript, use the prettify library. Add the following in your code to add the library for syntax highlighting −To use it, add the following to your tag −    Code comes here

To set all outline properties in one declaration, use the outline property. It sets the following properties: outline-width, outline-style, and outline-color.ExampleYou can try to run the following code to learn how to work with outline properties −Live Demo                    #box {             border: 2px dashed blue;          }                     This is a div.             Click to set Outline                function display() {             document.getElementById("box").style.outline = "5px solid red";          }          

Use the keydown event in JavaScript to get to know which keys are pressed at once. The following is the script −Examplevar log = $('#log')[0],    keyPressed = []; $(document.body).keydown(function (evt) {    var li = keyPressed [evt.keyCode];    if (!li) {       li = log.appendChild(document.createElement('li'));       keyPressed [evt.keyCode] = li;    }    $(li).text(Key Down: ' + evt.keyCode);    $(li).removeClass('key-up'); }); $(document.body).keyup(function (evt) {    var li = keyPressed [evt.keyCode];    if (!li) {       li = log.appendChild(document.createElement('li'));    }    $(li).text('Key Up: ' + evt.keyCode);    $(li).addClass('key-up'); });

To set outline color, use the outlineColor property in JavaScript. You can try to run the following code to learn how to implement outlineColor property − Example Live Demo #box { border: 2px solid red; } Demo Content Change outline color function display() { document.getElementById("box").style.outlineColor = "#FF5733"; document.getElementById("box").style.outline = "2px solid"; }