JavaScript get element by name
The reason you’re seeing that error is because document.getElementsByName returns a NodeList of elements. And a NodeList of elements does not have a .value property. Use this instead:
javascript
Merge/flatten an array of arrays
You can use concat to merge arrays: Run code snippetExpand snippet Using the apply method of concat will just take the second parameter as an array, so the last line is identical to this: There is also the Array.prototype.flat() method (introduced in ES2019) which you could use to flatten the arrays, although it is only available in Node.js starting with version 11, and not … Read more
What’s the difference between console.dir and console.log?
In Firefox, these function behave quite differently: log only prints out a toString representation, whereas dir prints out a navigable tree. In Chrome, log already prints out a tree — most of the time. However, Chrome’s log still stringifies certain classes of objects, even if they have properties. Perhaps the clearest example of a difference is a regular expression: You can also see a clear difference … Read more
How can I upload files asynchronously with jQuery?
I would like to upload a file asynchronously with jQuery. Run code snippetExpand snippet Instead of the file being uploaded, I am only getting the filename. What can I do to fix this problem?
What is the difference between call and apply?
The difference is that apply lets you invoke the function with arguments as an array; call requires the parameters be listed explicitly. A useful mnemonic is “A for array and C for comma.” See MDN’s documentation on apply and call. Pseudo syntax: theFunction.apply(valueForThis, arrayOfArgs) theFunction.call(valueForThis, arg1, arg2, …) There is also, as of ES6, the possibility to spread the array for use with the call function, you can see the compatibilities here. Sample code:
How to create a dialog with “yes” and “no” options
You’re probably looking for confirm(), which displays a prompt and returns true or false based on what the user decided:
jQuery animate backgroundColor
The color plugin is only 4kb so much cheaper than the UI library. Of course you’ll want to use a decent version of the plugin and not some buggy old thing which doesn’t handle Safari and crashes when the transitions are too fast. Since a minified version isn’t supplied you might like test various compressors and make your own min version. … Read more
AngularJS : Factory and Service?
Service vs Factory The difference between factory and service is just like the difference between a function and an object Factory Provider Gives us the function’s return value ie. You just create an object, add properties to it, then return that same object.When you pass this service into your controller, those properties on the object will now … Read more
How to use php code in javascript
What you can do is pass the variable from outside that .js file, like this: and then reference that variable the same as if you defined it within that .js file (mind the potential scope issue).
Make javascript alert Yes/No Instead of Ok/Cancel
You can use jQuery UI Dialog. These libraries create HTML elements that look and behave like a dialog box, allowing you to put anything you want (including form elements or video) in the dialog.