React Uncaught Error: Target container is not a DOM element [duplicate]
The way you have it it runs before you even have DOM. You should include it in the bottom like so:
javascript
Most efficient way to convert an HTMLCollection to an Array
will have the same effect using “native” code. Edit Since this gets a lot of views, note (per @oriol’s comment) that the following more concise expression is effectively equivalent: But note per @JussiR’s comment, that unlike the “verbose” form, it does create an empty, unused, and indeed unusable array instance in the process. What compilers do about … Read more
Format JavaScript date as yyyy-mm-dd
You can do: Usage example: Output: Demo on JSFiddle: http://jsfiddle.net/abdulrauf6182012/2Frm3/
How to write an inline IF statement in JavaScript?
You don’t necessarily need jQuery. JavaScript alone will do this. The c variable will be minor if the value is true, and major if the value is false. This is known as a Conditional (ternary) Operator. https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/Conditional_Operator
How can I check for an empty/undefined/null string in JavaScript?
If you just want to check whether there’s a truthy value, you can do: If you need to check specifically for an empty string over null, I would think checking against “” is your best bet, using the === operator (so that you know that it is, in fact, a string you’re comparing against).
Mouseover & Mouseout w/ Javascript
When you call an inline event handler such as you do with onmouseover=”MouseOver(this);” you’re passing a reference to the element itself to your function, and in your function you’re taking that reference and assigning it to the variable elem. You would then normally use elem within your function like elem.style.color = “white”;, not with parenthesis, as you’re not running a function … Read more
Mouseover & Mouseout w/ Javascript
When you call an inline event handler such as you do with onmouseover=”MouseOver(this);” you’re passing a reference to the element itself to your function, and in your function you’re taking that reference and assigning it to the variable elem. You would then normally use elem within your function like elem.style.color = “white”;, not with parenthesis, as you’re not running a function … Read more
How can I guarantee that my enums definition doesn’t change in JavaScript?
Since 1.8.5 it’s possible to seal and freeze the object, so define the above as: or and voila! JS enums. However, this doesn’t prevent you from assigning an undesired value to a variable, which is often the main goal of enums: One way to ensure a stronger degree of type safety (with enums or otherwise) is … Read more
Short circuit Array.forEach like calling break
There’s no built-in ability to break in forEach. To interrupt execution you would have to throw an exception of some sort. eg. Run code snippetExpand snippet JavaScript exceptions aren’t terribly pretty. A traditional for loop might be more appropriate if you really need to break inside it. Use Array#some Instead, use Array#some: Run code snippetExpand snippet This works because some returns true as soon as any of the … Read more
Short circuit Array.forEach like calling break
There’s no built-in ability to break in forEach. To interrupt execution you would have to throw an exception of some sort. eg. Run code snippetExpand snippet JavaScript exceptions aren’t terribly pretty. A traditional for loop might be more appropriate if you really need to break inside it. Use Array#some Instead, use Array#some: Run code snippetExpand snippet This works because some returns true as soon as any of the … Read more