count(): Parameter must be an array or an object that implements Countable error in php
This is because you are counting on ‘NULL’, Try it like this:
html
Can I force a page break in HTML printing?
Add a CSS class called “pagebreak” (or “pb”), like so: Then add an empty DIV tag (or any block element that generates a box) where you want the page break. It won’t show up on the page, but will break up the page when printing. P.S. Perhaps this only applies when using -after (and also … Read more
jQuery document.createElement equivalent?
Here’s your example in the “one” line. Update: I thought I’d update this post since it still gets quite a bit of traffic. In the comments below there’s some discussion about $(“<div>”) vs $(“<div></div>”) vs $(document.createElement(‘div’)) as a way of creating new elements, and which is “best”. I put together a small benchmark, and here … Read more
count(): Parameter must be an array or an object that implements Countable error in php
This is because you are counting on ‘NULL’, Try it like this:
How do I check whether a checkbox is checked in jQuery?
This worked for me: Where isAgeSelected is the id of the control. Also, @karim79’s answer works fine. I am not sure what I missed at the time I tested it. Note, this is answer uses Microsoft Ajax, not jQuery
How to create an HTML button that acts like a link
HTML The plain HTML way is to put it in a <form> wherein you specify the desired target URL in the action attribute. If necessary, set CSS display: inline; on the form to keep it in the flow with the surrounding text. Instead of <input type=”submit”> in above example, you can also use <button type=”submit”>. … Read more
What’s the difference between HTML ‘hidden’ and ‘aria-hidden’ attributes?
ARIA (Accessible Rich Internet Applications) defines a way to make Web content and Web applications more accessible to people with disabilities. The hidden attribute is new in HTML5 and tells browsers not to display the element. The aria-hidden property tells screen-readers if they should ignore the element. Have a look at the w3 docs for … Read more
React.js: Set innerHTML vs dangerouslySetInnerHTML
Yes there is a difference! The immediate effect of using innerHTML versus dangerouslySetInnerHTML is identical — the DOM node will update with the injected HTML. However, behind the scenes when you use dangerouslySetInnerHTML it lets React know that the HTML inside of that component is not something it cares about. Because React uses a virtual … Read more
How to fix “Cannot read property ‘addEventListener’ of null” error [duplicate]
You are loading the Javascript file in the <head>, before the body of your HTML Is loaded. Therefore your line Has nothing to look up – your button with class guessSubmit doesn’t exist yet. And since guessSubmit is null, it does not contain any properties, hence the error. The easiest solution is to put your … Read more
ReferenceError: $ is not defined
Add jQuery library before your script which uses $ or jQuery so that $ can be identified in scripts.