This question already has answers here:
Selecting second children of first div children in javascript [duplicate]
(6 answers)
Closed 8 years ago.
Which is better or what are the differences, when you want to select an nth child? Please note I do not want to use jQuery.
Well, you don't provide much information, but you've got two ways:
Let node be a DOM node:
node.childNodes[1]; //0 is the first child.
Another way...
node.querySelector(':nth-child(2)'); //in selectors, the first child has index 1.
Related
This question already has answers here:
How to get the difference between two arrays in JavaScript?
(84 answers)
Closed 1 year ago.
Trying to figure out the proper syntax on filtering elements out of one array if they belong in another but can't get it right. In the following example I'm trying to remove any elements in array1 that are in array2. Any ideas on how to make it work?
array1.filter( element => array2.includes( element ) );
array1.filter( element => !array2.includes( element ) );
This question already has answers here:
How can I change an element's class with JavaScript?
(33 answers)
Closed 2 years ago.
I dynamically created various images and other elements within various div elements and assigned a class to them, like:
divOM = document.getElementById('omain');
kd = document.createElement('img');
kd.src = 'pics/k0.jpg';
kd.class = 'mww';
divOM.appendChild(kd);
This works well – the debugger shows the desired result (# children with class ‘mww’). I have the (maybe naïve) hope that
wlist = document.getElementsByClassName('mww')
gives me all elements which have class=’mww’, but unfortunately it doesn’t. The debugger shows length:0 for wlist!?? Is it possible that document.getElementsByClassName doesn’t work for dynamically created elements?
Should be .className, not .class.
class is a reserved word in JavaScript.
Or use the Class List API:
kd.classList.add('mww');
This question already has answers here:
Javascript getElementById based on a partial string
(9 answers)
Closed 3 years ago.
I just want to know to how to use custom varible with javascript.suppose we have 5 id with name zawsz,baws2,tawsx,paws4,vawsa and we want to execute single DOM command to all these element whose id is define here.
document.getElementById("-aws-").onclick=function(){}
Here -aws- define all the id define above.(-) can be replace with any char/int value;
You could use the following code:
(The following code will select all elements of which the id includes aws.
I have tested this code and it works: https://jsfiddle.net/5042woqz/)
document.querySelectorAll('*[id*="aws"]').forEach(function(item) {
item.onclick=function() {
console.log('click!');
};
});
Items will now be an array containing all your aws- items.
If you have further questions, just let me know.
P.S.: You could achieve the same thing really easily with jquery.
You can use document.querySelectorAll for this:
document.querySelectorAll('[id^="aws"]')
That will select all elements where the id attribute starts with (^=) "aws".
This question already has answers here:
What do querySelectorAll and getElementsBy* methods return?
(12 answers)
Closed 5 years ago.
I have looked around and I haven't really been able to find anything that solves my problem. There is a post using buttons but I can't seem to modify it for my needs.
I am trying to use only one event listener for multiple selects. I'd like to return the id of the select, and the value selected but as far as I can figure I either need to use document.getElementById("ID").addEventListener('change',func(),true) for each id or document.getElementsByTagName('select').addEventListener('change', func(), true) and I get an error that says:
selection.addEventListener is not a function. (In 'selection.addEventListener('change', func(), true)', 'selection.addEventListener' is undefined)
I was hoping someone could take a moment and show me where I am going wrong or if I need to use a different method to accomplish my task.
thanks for the help
The method getElementsByTagName returns HTMLCollection of elements, and not a DOM Element, so you can't use addEventListener on that.
What you can do is go over all the elements in the HTMLCollection and add the event you want to them:
let selectElements = document.getElementsByTagName('select');
Array.prototype.forEach.call(selectElements, function(el) {
eladdEventListener('change', func(), true)
})
This question already has answers here:
How to add a class to a given element?
(28 answers)
Closed 7 years ago.
Is there a way to add a second class to an HTML tag using javascript? For example, say you had the element <p class="a"> and you wanted to add class="b". If you used document.getElementByClassName("a").class = "b" that would remove class "a". Is there a way to have both in the same element?
document.getElementsByClassName("a")[0].className += " b"
First of all, the method is named getElementsByClassName, plural. You need to refer to a specific element in the collection that it returns, via a zero-based index.
And you need the space before b here, so that you don’t end up with ab, but a b.
Try this one here:
document.getElementByClassName("a").className += " b"
Got it from here: How do I add a class to a given element?