Front End Technology Articles - Page 649 of 745

In this tutorial, let us discuss the three types of errors we can expect in our JavaScript code. Errors are statements that block the execution of the program. During the compilation of the program, three types of errors can occur. These are syntax errors, run time errors, and logical errors. Syntax Errors Syntax errors are usual errors. Incorrect syntax causes parsing issues during the code interpretation. For example, add a semicolon instead of a colon in an object declaration. Syntax errors affect only the respective code thread. The remaining code works as it is. A grammatical mistake is the ultimate ... Read More

In this tutorial, we will learn how to play a multimedia file using JavaScript. The multimedia file is the audio and video files. The multimedia files can be of different formats. wav and mp3 are two examples of audio file formats, whereas mp4 and mkv are examples of video file formats. In HTML, multimedia files can be shown easily using different tags. We use the video tag for showing a video, and for audio, we use the audio tag. These two tags are quite similar, and many attributes are the same in both tags. The "src" attribute defines the path ... Read More

To list down all the plug-on installed in the web browser, use the JavaScript navigator object. The JavaScript navigator object includes a child object called plugins. This object is an array, with one entry for each plug-in installed on the browser.ExampleYou can try to run the following code to list down all the plug-in installed in your browser −           List of Plug-Ins                                       Plug-in Name             Filename             Description                                 for (i = 0;  i < navigator.plugins.length;  i++)             {                document.write("");                document.write(navigator.plugins[i].name);                                document.write("");                document.write(navigator.plugins[i].filename);                                document.write("");                document.write(navigator.plugins[i].description);                document.write("");             }                    

Generally, animation in JavaScript is done to get different effects and make the object move around the page. You can move and animate any type of HTML element using manual or automated animations in JavaScript. In this tutorial, we will learn how to differentiate between manual and automated animation in JavaScript. Manual Animation Before explaining the difference between the two common types of animation used in JavaScript, we must learn the process of animating objects manually. Under Manual Animation, the animation process is not automated. The following is the implementation of a simple animation using DOM object properties and ... Read More

If you have set a time using setTimeout() function, then you can clear it using the JavaScript clearTimeout() function.ExampleYou can try to run the following code learn how to implement clearTimeout() function in JavaScript −           JavaScript Animation                                                        Click the buttons below to handle animation                              

You can use several Navigator related properties in your web page. The following are the properties −Sr.NoProperties & Description1javaEnabled()This method determines if JavaScript is enabled in the client. If JavaScript is enabled, this method returns true; otherwise, it returns false.2plugings.refreshThis method makes newly installed plug-ins available and populates the plugins array with all new plug-in names. Netscape only.3preference(name, value)This method allows a signed script to get and set some Netscape preferences. If the second parameter is omitted, this method will return the value of the specified preference; otherwise, it sets the value. Netscape only.4taintEnabled()This method returns true if data tainting ... Read More

The code while using anonymous functions is more readable when handlers are to be defined inside the calling code. Anonymous functions are declared inline. Normally, inline functions are better since they can access variables in the parent scopes.It allows for creating a function without any names identifier. It can be used as an argument to other functions. You can call them using a variable name.This is how JavaScript anonymous functions can be used −var func = function() {    alert(‘This is anonymous'); } func();Here’s an example −//anonymous function var a = function() {    return 5; }

To debug JavaScript on the iPad, you need to open the Safari browser.Now enable Web Inspector in iOS. In the Settings app, select Safari. Tap the Advanced option and start Web Inspector −Now select Web Inspector −Use a USB cable to connect the iPad to Mac. Safari opens and your iPad now visible in the DEVELOP Menu. After selecting, start debugging JavaScript.

To debug CSS/JavaSript hover issues, you need to follow the below-given steps, Press F12 to open Inspect Element, in Firefox. In the DOM view right-click the element, and Select :hover, :active or :focus at the bottom of the context menuThe following screenshot shows how to debug hover issues −

To debug obfuscated JavaScript code, you need to use a JavaScript formatter or beautifier. Go to the following link to beautify JavaScript, In the left section, add your obfuscated JavaScript code and click Beautify as shown below, On clicking, you can see Beautified JavaScript code in the right section.