I try to select a certain DOM element with jQuery. The HTML content: I want to select Item #1. I used I got TypeError: $(…).children is not a function What’s wrong here? Answer You need to include jQuery in your page. Most browsers nowadays include a $() function in their console by default for ea…
Tag: javascript
Do I have to reference TypeScript definition in every file?
Is there a way to tell TypeScript to use a certain file (or set of files) as a definition for everything compiled? My only alternative currently is to add something like this in every single TypeScript file (which seems clunky): Answer When using TypeScript’s internal module system, you can avoid having…
getBoundingClientRect returning wrong results
I’m struggling a little trying to determine the current location and size of an element within the DOM. I’ve put together a fragment to illustrate a card based system down the right hand side of the screen. The behavior that I’m trying to build is that when you click on one of those cards, a…
Html5 video paused at specific time VideoFrame
For a project i need to pause a video at a very specific time. In order to be precise i watch the frame of the video using VideoFrame. demo here It’s works but i don’t understand why i need to click twice to relanch the video. Any ideas or others solutions ? Thanks Answer Push the video 1 frame af…
Am I using semicolons right in js?
I have been doing some basic js but I am not sure if I am using semicolons correctly. Here is my code: Please correct me in the comments if I am using them wrong. Thanks, Reece C. Answer Modify the following lines and it’d look good to me, semi-colonwise. The semi-colon is only required in JavaScript wh…
Finding the selected index by getElementById isn’t returning the right value
The selection of the “building” drop-down should equal zero. It is on the the first option. Function search() is executed when the button beside the drop-down is selected. For some reason the alert is returning “It didn’t work.” Here is the selection drop-down. And here is the bu…
What is the pattern used by Google Tag Manager in order to observe de `dataLayer` Array?
I observed the dataLayer array and I don’t see any changes to push. No custom methods at all, actually. How is GTM observing the changes to the array? As far as I know, changes to an Array don’t throw any events, do they? Edit: I did some more research and found Google’s library for interact…
Is there destructor in typeScript
Is there destructor in TypeScript? If not, how can I delete an object? I tried destructor() and ~ClassName() but it didn’t work. Answer JavaScript uses garbage collection to automatically delete objects when they are no longer referenced. There is no concept of destructors or finalizers. You can’t…
how to restrict special characters and ( /,*,+) only
We have one text Field.We know how to restrict special characters.But We need Allow alphabet and Numbers and hyphen(-) only.No need Sepcial characters but except (-) . Give me any idea. Mycode: If we tried this code it’s restrict spectal charecters but it’s allow -,/,+ Please guide me only allow n…
OnChange event using React JS for drop down
The onChange event does not work. Answer The change event is triggered on the <select> element, not the <option> element. However, that’s not the only problem. The way you defined the change function won’t cause a rerender of the component. It seems like you might not have fully graspe…