Set CSS property in JavaScript?
Use element.style:
javascript
socket.io – ReferenceError: io is not defined
I found the answer for anyone who gets immensely confused by the horrible lack of documentation of socket.io. You cannot source /socket-lib/socket.io.js, you must source http://yourwebsite.com:12345/socket.io/socket.io.js. The server automatically does the rest for you.
What do these three dots in React do?
That’s property spread notation. It was added in ES2018 (spread for arrays/iterables was earlier, ES2015), but it’s been supported in React projects for a long time via transpilation (as “JSX spread attributes” even though you could do it elsewhere, too, not just attributes). {…this.props} spreads out the “own” enumerable properties in props as discrete properties … Read more
How to check ‘undefined’ value in jQuery
JQuery library was developed specifically to simplify and to unify certain JavaScript functionality. However if you need to check a variable against undefined value, there is no need to invent any special method, since JavaScript has a typeof operator, which is simple, fast and cross-platform: It returns a string indicating the type of the variable … Read more
How to change the text of a label?
ASP.Net automatically generates unique client IDs for server-side controls. Change it to In ASP.Net 4.0, you could also set the ClientIDMode property to Static instead.
Insert a string at a specific index
You could prototype your own splice() into String. Polyfill Example Expand snippet EDIT: Modified it to ensure that rem is an absolute value. You could prototype your own splice() into String. Polyfill Example Expand snippet EDIT: Modified it to ensure that rem is an absolute value.
Getting HTML form values
HTML: JS:
JavaScript code to stop form submission
You can use the return value of the function to prevent the form submission and function like In case of Chrome 27.0.1453.116 m if above code does not work, please set the event handler’s parameter’s returnValue field to false to get it to work. Thanks Sam for sharing information. EDIT : Thanks to Vikram for … Read more
How to fire an event on class change using jQuery?
There is no event raised when a class changes. The alternative is to manually raise an event when you programatically change the class: UPDATE This question seems to be gathering some visitors, so here is an update with an approach which can be used without having to modify existing code using the new MutationObserver: Expand … Read more
jQuery – Increase the value of a counter when a button is clicked
You cannot use ++ on something which is not a variable, this would be the closest you can get: jQuery’s html() method can get and set the HTML value of an element. If passed a function it can update the HTML based upon the existing value. So in the context of your code: DEMO: http://jsfiddle.net/marcuswhybrow/zRX2D/2/ … Read more