Javascript Runtime error: $ is undefined
$ is defined by jQuery, which you probably haven’t referenced. A simple way to get it is to add one of the CDN urls to your template HTML:
javascript
jquery SlideToggle effect in upward direction?
I need to make a jquery slidetoggle effect in upward direction., now the slide toggle is working only in downward direction. When i used slide up method i couldn’t use same button to slide up and slide down the div. Here is my code: } I am a beginner in jquery., please help me š
How to Create simple drag and Drop in angularjs
I want to know how to do drag and drop by using AngularJs. This is what I have so far: http://plnkr.co/edit/llTH9nRic3O2S7XMIi6y?p=preview..
Get the values from the “GET” parameters (JavaScript)
JavaScript itself has nothing built in for handling query string parameters. Code running in a (modern) browser you can use the URL object (which is part of the APIs provided by browsers to JS): Run code snippetExpand snippet For older browsers (including Internet Explorer), you can use this polyfill or the code from the original version of this answer that predates URL: You … Read more
What’s the source of Error: getaddrinfo EAI_AGAIN?
My server threw this today, which is a Node.js error I’ve never seen before: I’m wondering if this is related to the DynDns DDOS attack which affected Shopify and many other services today. Here’s an article about that. My main question is what does dns.js do? What part of node is it a part of? How can I … Read more
Pure JavaScript: a function like jQuery’s isNumeric()
There’s no isNumeric() type of function, but you could add your own: NOTE: Since parseInt() is not a proper way to check for numeric it should NOT be used.
React with ES7: Uncaught TypeError: Cannot read property ‘state’ of undefined
Make sure you’re calling super() as the first thing in your constructor. You should set this for setAuthorState method Another alternative based on arrow function:
What is prevState in ReactJS? [duplicate]
prevState is a name that you have given to the argument passed to setState callback function. What it holds is the value of state before the setState was triggered by React; Since setState does batching, its sometimes important to know what the previous state was when you want to update the new state based on the previous state value. So … Read more
How do you round to 1 decimal place in Javascript?
Math.round(num * 10) / 10 works, here is an example… if you want it to have one decimal place, even when that would be a 0, then add… EDIT: Add round with precision function… Using this principle, for reference, here is a handy little round function that takes precision… … usage … … defaults to round … Read more
Getting “TypeError: failed to fetch” when the request hasn’t actually failed
The issue could be with the response you are receiving from back-end. If it was working fine on the server then the problem could be with the response headers. Check theĀ Access-Control-Allow-OriginĀ (ACAO) in the response headers. Usually react’s fetch API will throw fail to fetch even after receiving response when the response headers’ ACAO and the … Read more