Javascript Articles - Page 442 of 534

To disable zooming capabilities in responsive design, you need to create a META viewport tag.With that, set the user-scalable property to 'no' like −user-scalable=noAdd the following in your HTML code to disable zooming capabilities in responsive design −

To display HTML5 client-side validation error bubbles, use the required attribute.You do not need to have JavaScript for client side validations like empty text box would never be submitted because HTML5 introduced a new attribute called required which would be used as follows and would insist to have a value:                    Enter email :          Try to submit using Submit button                    

The Local Storage is designed for storage that spans multiple windows and lasts beyond the current session. In particular, Web applications may wish to store megabytes of user data, such as entire user-authored documents or a user's mailbox, on the client side for performance reasons.For storing credentials in local storage, on successful login, generate a completely random string unrelated to user credentials. You need to store this in the database. Do not forget to add an expiry date. Pass that string to the JavaScript to be stored in local storage.As long as the local storage credential matches the database and ... Read More

Web Workers allow for long-running scripts that are not interrupted by scripts that respond to clicks or other user interactions and allows long tasks to be executed without yielding to keep the page responsive.Web Workers are background scripts and they are relatively heavyweight and are not intended to be used in large numbers. For example, it would be inappropriate to launch one worker for each pixel of a four-megapixel image.Web Workers initialized with the URL of a JavaScript file, which contains the code the worker will execute. This code sets event listeners and communicates with the script that spawned it ... Read More

Use preload = ”auto” to avoid repeat reloading of HTML video on the same page −                                        Your browser does not support the video tag.          

IE9 does not support File APIIF10 started supported File APIAn example of that would be drag and drop. Now HTML 5 came up with a Drag and Drop (DnD) API that brings native DnD support to the browser making it much easier to code up.                    #boxA, #boxB { float:left;padding:10px;margin:10px; -moz-user-select:none; }          #boxA { background-color: #6633FF; width:75px; height:75px; }          #boxB { background-color: #FF6699; width:150px; height:150px; }                      function dragStart(ev) {   ... Read More

To make canvas fill the whole page, you need to be 100% in width and height of the page.* {    margin: 0;    padding: 0; } body, html {    height:100%; } #canvas {    position:absolute;    height:100%; width:100%; }

Use the autocomplete attribute for autocomplete text input. The autocomplete attribute is used with a form elements to set the autocomplete feature on or off. If the autocomplete feature is on, the browser will automatically show values, based on what users entered before in the field.If the autocomplete feature is off, the browser won’t automatically show values, based on what users entered before in the field.The following are the attribute values −S. NoAttribute ValueDescription1onThis is the default value. The browser automatically complete values based on what users entered before.2offThe browser won’t complete values based on what users entered before. Users have to ... Read More

To embed a PDF file in an HTML5 page, use the element.           HTML iframe Tag               HTML5 Tutorial          

Yes, follow this approach −Move to the HTML5 doctype − Use or even the new elements like Or the newer HTML5 tags or , you can still use the outdated tag.The controls have backward compatibility too. The works the same as in browsers that do not support it.However, if you are working t for legacy Internet Explorer, then use html5shiv. It enables the use of HTML5 sectioning elements in legacy Internet Explorer.