Maybe I'm not using 'this' right.
HTML:
<div style="margin: 4px; padding: 10px; border: solid 1px;" onmouseover="darken(this);">
JavaScript:
function darken(elt) {
"use strict";
document.getElementById(elt.id).style.backgroundColor = "#e8e8e8";
}
?
If you have a reference to the element, there's no need to lookup its ID then query the document for the element matching that ID. (There is no ID assigned to that element by the way).
this is a reference to the element. You could simply use it as:
function darken(elt) {
elt.style.backgroundColor = '#e8e8e8';
}
jsFiddle Demo
The first issue is that there is no id on that element so you cannot use document.getElementById to find it.
An advantage that you can use is that you already passed the element with this:
function darken(elt) {
"use strict";
elt.style.backgroundColor = "#e8e8e8";
}
You havn't provided any Id to your div element
<div id="myDiv" style="margin: 4px; padding: 10px; border: solid 1px;" onmouseover="darken(this);">
JS Fiddle Demo
Related
I am trying to get the last child of a <div> but I am failing. Here is the code that I use for it but it always returns undefined.
$('#output:last-child').attr('class');
What is wrong? How can I fix it?
This is supposed to be the last element:
<div class='hisout ${hisclass}'><p class="he">` + message + '</p></div>
Use the child combinator selector:
$('#output > :last-child').attr('class');
Edit: Added example
#output > :last-child {
height: 20px;
width: 20px;
background: red;
border: 1px solid green;
}
<div id="output">
<div>....</div>
<div>....</div>
<div>....</div>
</div>
Your selector is retrieving the #output element that is the last child of its parent.
From the description it sounds like you want to find the last child within #output, as such you need to separate the selectors:
$('#output div:last-child').attr('class');
You can try with the children() and last() functions:
$('#output').children().last().attr('class')
To specifically filter a type of child, you can specify the type in the children() call:
...children('div')...
Using a selector may be faster, though.
I simply try to change the value of the href
$("div").click(function() {
$("a#link1").attr("href").val("www.bing.de");
});
div {
border: 1px solid black;
cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a id="link1" href="www.google.de">LINK</a>
<div>Click here</div>
But this throws the error Uncaught TypeError: $(...).attr(...).val is not a function and I don't know why? As far as I know val IS a function.
Try this.
You can't change an attribute with val() method. val() is use only for input value.
You can use attr("aatribute_name",value); or prop("attribute_name","value");
$("div").click(function() {
$("a#link1").attr("href","www.bing.de");
});
div {
border: 1px solid black;
cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a id="link1" href="www.google.de">LINK</a>
<div>Click here</div>
You can use attr or prop
$("a#link1").prop("href","www.bing.de")
It is the attribute value that you want to change not val. val is basically use to get the value and some time set the value, but not the attribute.
Try the following snippet.
Problem is here: $("a#link1").attr("href").val("www.bing.de");
$("div").click(function(){
$("a#link1").attr("href","www.bing.de");
});
div {
border: 1px solid black;
cursor:pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a id="link1" href="www.google.de">LINK</a>
<div>Click here</div>
Javascript implementation using setAttribute() :
document.querySelector("a#link1").setAttribute("href", "www.bing.de");
//or
document.querySelector("a#link1").href = "www.bing.de";
Hope this helps.
Assign with href is also working
$("div").click(function() {
$("a#link1")[0].href = "www.bing.de";
});
.val() is used for inputs, selects and textareas. It should be called like this:
$("div").click(function() {
$("a#link1").attr('href','www.bing.de');
});
Why it was not working because you were trying assign value to anchor tag. val() doesn't assigns value to anchor tag. For that you have to use method as below.
Not this :-
$("div").click(function() {
$("a#link1").attr("href").val("www.bing.de");
});
This one -
$("div").click(function() {
$("a#link1").attr("href","www.bing.de");
});
Fiddle here: http://jsfiddle.net/yv1vLhd9/
For whatever reasons, suppose I want to replace three dom elements with three others using JQuery, but I want to transfer one or more data attributes from the first elements onto their corresponding replacements.
Given the following HTML:
<div class='original' data-custom="dog"></div>
<div class='original' data-custom="cat"></div>
<div class='original' data-custom="sheep"></div>
And the following CSS:
div {
width: 100px;
height: 100px;
}
div:before {
content: attr(data-custom);
}
.original {
border: blue solid 1px;
}
.new {
border: pink solid 1px;
}
How can I make sure there is a new element with each of the custom data attributes?
For example:
$(document).ready( function(){
var $originalEl = $('.original')
var originalData = $originalEl.data('custom')
var replacement = '<div class="new" data-custom="' + originalData + '"></div>'
$originalEl.after(replacement).hide()
});
But this creates three new data-custom="dog" attributes.
You must use $.each for the element.
Starting after you declare $originalEl
$originalEl.each(function(){
// code here
})
Here is your code updated http://jsfiddle.net/yv1vLhd9/4/
http://jsfiddle.net/VixedS/wz95hh3r/1/
$(document).ready(function(){
$('.original').each(function(){
$(this).hide().clone().attr('class','new').show().appendTo('body');
})
});
jQuery provides a host of DOM manipulation methods that will help you achieve the desired input. As noted by some of the other answers, you'll need to traverse over the set of matched elements using $.each. In addition, rather than creating new elements from strings, you can use the .clone() method to:
clone the existing element
modify your new element
insert it after the original element
traverse to the original element
and finally hide the original element.
$(function () {
$('.original').each(function (idx, elem) {
$(elem)
.clone()
.removeClass('original')
.addClass('new')
.insertAfter($(elem))
.prev()
.hide();
});
});
div {
width: 100px;
height: 100px;
}
div:before {
content: attr(data-custom);
}
.original {
border: blue solid 1px;
}
.new {
border: pink solid 1px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class='original' data-custom="dog"></div>
<div class='original' data-custom="cat"></div>
<div class='original' data-custom="sheep"></div>
API Method References:
jQuery.each()
.clone()
.removeClass()
.addClass()
.insertAfter()
.prev()
.hide()
I am trying to use JavaScript to change the background color of an element after being selected, and also to make sure that only one element at a time has the particular background color. Once the user selects on a different element I would like the previous element that was selected to be replaced by a different background color. Currently I am only able to toggle individual elements by selecting on EACH element. I need to be able to select on an element and apply the new background color, then have JavaScript change the background color of the previously active element to a different color (one less click).
What I am trying to do is very similar to modern navbars or list items where only one element at a time is “active” and has a background color that is different than the other elements in the same div, row, etc.
Notes about my work I am utilizing bootstrap and have no desire to use jQuery for this particular project.
CSS:
<!DOCTYPE html>
<html lang="en">
<head>
<style>
h4 {
border: 1px solid black;
border-radius: 8px;
padding: 10px 2px 10px 2px;
margin: 20px 20px 0px 20px;
background-color: #F0F0F0;
border-color: #F8F8F8;
color: #505050;
cursor: pointer;
}
.active {
background-color: #99E6FF;
}
</style>
</head>
</html>
HTML:
<div id="pTwoRowOne">
<div class="row">
<div class="col-md-4 row row-centered">
<h4 id="techBio" class="test">Biology</h4>
</div>
<div class="col-md-4 row row-centered">
<h4 id="techCart" class="test">Cartography</h4>
</div>
<div class="col-md-4 row row-centered">
<h4 id="techChem" class="test">Chemistry</h4>
</div>
</div>
</div>
JavaScript:
document.getElementById("techBio").onclick=function() {
document.getElementById("techBio").classList.toggle('active');
}
document.getElementById("techCart").onclick=function() {
document.getElementById("techCart").classList.toggle('active');
}
document.getElementById("techChem").onclick=function() {
document.getElementById("techChem").classList.toggle('active');
}
An example can be seen here: http://jsbin.com/fugogarove/1/edit?html,css,js,output
If clarification is needed let me know.
Yup, pretty straightforward.
Assumptions
You're not trying to support IE8, since you're using classList
You're okay with housing your elements as variables as opposed to repeatedly querying the DOM.
Example
JSBin
Code
I rewrote your JavaScript to make it a little bit cleaner and to DRY it up a bit:
var techs = [].slice.call(document.querySelectorAll('#pTwoRowOne h4'));
function set_active(event) {
techs.forEach(function(tech){
if (event.target == tech) { return; }
tech.classList.remove('active');
});
event.target.classList.toggle('active');
}
techs.forEach(function(item) {
item.addEventListener('click', set_active);
});
Some explanation
[].slice.call(document.querySelectorAll('#pTwoRowOne h4')); – We're using this to change the output from a NodeList to an Array. This allows us to use forEach later. querySelectorAll returns a NodeList that contains all elements matching the CSS selector. You can probably replace that with a better CSS selector depending on your environment.
addEventListener is a much nicer way than the iterative add via onclick += to bind an event listener. It's also the recommended way (as far as I know) in ECMA5 and later.
By setting the element queries as variables, you'll be able to keep the reference in memory instead of polling the DOM every time to alter elements. That'll make your JavaScript marginally faster, and it's again just a nicer, cleaner version of the code which it produces.
updates
I reworked the JS to make more sense.
Assuming you only ever have one active element, you can find it using document.querySelector() - if you can have multiples you can use document.querySelectorAll() and iterate through them.
Simple case:
function activate(event) {
var active=document.querySelector('.active');
// activate the clicked element (even if it was already active)
event.target.classList.add('active');
// deactivate the previously-active element (even if it was the clicked one => toggle)
if (active) active.classList.remove('active');
}
document.getElementById("techBio").addEventListener("click",activate);
document.getElementById("techCart").addEventListener("click",activate);
document.getElementById("techChem").addEventListener("click",activate);
h4 {
border: 1px solid black;
border-radius: 8px;
padding: 10px 2px 10px 2px;
margin: 20px 20px 0px 20px;
background-color: #F0F0F0;
border-color: #F8F8F8;
color: #505050;
cursor: pointer;
}
.active {
background-color: #99E6FF;
}
<div id="pTwoRowOne">
<div class="row">
<div class="col-md-4 row row-centered">
<h4 id="techBio" class="test">Biology</h4>
</div>
<div class="col-md-4 row row-centered">
<h4 id="techCart" class="test">Cartography</h4>
</div>
<div class="col-md-4 row row-centered">
<h4 id="techChem" class="test">Chemistry</h4>
</div>
</div>
</div>
Another similar yet simpler way to do it: jsBin ;)
var H4 = document.getElementsByClassName("test"), act;
[].forEach.call(H4, function(el){
el.addEventListener("click", function(){
if(act) act.classList.remove("active");
return (this.classList.toggle("active"), act=this);
});
});
You can do something like this:
[].slice.call(document.querySelectorAll(".test")).forEach(function(element) {
element.addEventListener('click', function(event) {
if (activeElement = document.querySelector(".test.active")) {
activeElement.classList.remove("active");
};
event.target.classList.add('active');
});
});
Basically, first we remove the active class from the active element, then we add it to the target.
JSBin
I would like to move one DIV element inside another. For example, I want to move this (including all children):
<div id="source">
...
</div>
into this:
<div id="destination">
...
</div>
so that I have this:
<div id="destination">
<div id="source">
...
</div>
</div>
You may want to use the appendTo function (which adds to the end of the element):
$("#source").appendTo("#destination");
Alternatively you could use the prependTo function (which adds to the beginning of the element):
$("#source").prependTo("#destination");
Example:
$("#appendTo").click(function() {
$("#moveMeIntoMain").appendTo($("#main"));
});
$("#prependTo").click(function() {
$("#moveMeIntoMain").prependTo($("#main"));
});
#main {
border: 2px solid blue;
min-height: 100px;
}
.moveMeIntoMain {
border: 1px solid red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="main">main</div>
<div id="moveMeIntoMain" class="moveMeIntoMain">move me to main</div>
<button id="appendTo">appendTo main</button>
<button id="prependTo">prependTo main</button>
My solution:
Move:
jQuery("#NodesToMove").detach().appendTo('#DestinationContainerNode')
copy:
jQuery("#NodesToMove").appendTo('#DestinationContainerNode')
Note the usage of .detach(). When copying, be careful that you are not duplicating IDs.
Use a vanilla JavaScript solution:
// Declare a fragment:
var fragment = document.createDocumentFragment();
// Append desired element to the fragment:
fragment.appendChild(document.getElementById('source'));
// Append fragment to desired element:
document.getElementById('destination').appendChild(fragment);
Check it out.
Try plain JavaScript: destination.appendChild(source);.
onclick = function(){ destination.appendChild(source) };
div {
margin: .1em;
}
#destination {
border: solid 1px red;
}
#source {
border: solid 1px gray;
}
<div id=destination>
###
</div>
<div id=source>
***
</div>
I just used:
$('#source').prependTo('#destination');
Which I grabbed from here.
If the div where you want to put your element has content inside, and you want the element to show after the main content:
$("#destination").append($("#source"));
If the div where you want to put your element has content inside, and you want to show the element before the main content:
$("#destination").prepend($("#source"));
If the div where you want to put your element is empty, or you want to replace it entirely:
$("#element").html('<div id="source">...</div>');
If you want to duplicate an element before any of the above:
$("#destination").append($("#source").clone());
// etc.
You can use:
To insert after,
jQuery("#source").insertAfter("#destination");
To insert inside another element,
jQuery("#source").appendTo("#destination");
You can use the following code to move the source to the destination:
jQuery("#source")
.detach()
.appendTo('#destination');
Try the working CodePen.
function move() {
jQuery("#source")
.detach()
.appendTo('#destination');
}
#source{
background-color: red;
color: #ffffff;
display: inline-block;
padding: 35px;
}
#destination{
background-color:blue;
color: #ffffff;
display: inline-block;
padding: 50px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="source">
I am source
</div>
<div id="destination">
I am destination
</div>
<button onclick="move();">Move</button>
If you want a quick demo and more details about how you move elements, try this link:
http://html-tuts.com/move-div-in-another-div-with-jquery
Here is a short example:
To move ABOVE an element:
$('.whatToMove').insertBefore('.whereToMove');
To move AFTER an element:
$('.whatToMove').insertAfter('.whereToMove');
To move inside an element, ABOVE ALL elements inside that container:
$('.whatToMove').prependTo('.whereToMove');
To move inside an element, AFTER ALL elements inside that container:
$('.whatToMove').appendTo('.whereToMove');
I need to move content from one container to another including all the event listeners. jQuery doesn't have a way to do it, but the standard DOM function appendChild does.
// Assuming only one .source and one .target
$('.source').on('click',function(){console.log('I am clicked');});
$('.target')[0].appendChild($('.source')[0]);
Using appendChild removes the .source* and places it into target including its event listeners: Node.appendChild() (MDN)
You may also try:
$("#destination").html($("#source"))
But this will completely overwrite anything you have in #destination.
You can use pure JavaScript, using appendChild() method...
The appendChild() method appends a node as the last child of a node.
Tip: If you want to create a new paragraph, with text, remember to
create the text as a Text node which you append to the paragraph, then
append the paragraph to the document.
You can also use this method to move an element from one element to
another.
Tip: Use the insertBefore() method to insert a new child node before a
specified, existing, child node.
So you can do that to do the job, this is what I created for you, using appendChild(), run and see how it works for your case:
function appendIt() {
var source = document.getElementById("source");
document.getElementById("destination").appendChild(source);
}
#source {
color: white;
background: green;
padding: 4px 8px;
}
#destination {
color: white;
background: red;
padding: 4px 8px;
}
button {
margin-top: 20px;
}
<div id="source">
<p>Source</p>
</div>
<div id="destination">
<p>Destination</p>
</div>
<button onclick="appendIt()">Move Element</button>
I noticed huge memory leak & performance difference between insertAfter & after or insertBefore & before .. If you have tons of DOM elements, or you need to use after() or before() inside a MouseMove event, the browser memory will probably increase and next operations will run really slow.
The solution I've just experienced is to use inserBefore instead before() and insertAfter instead after().
Dirty size improvement of Bekim Bacaj's answer:
div { border: 1px solid ; margin: 5px }
<div id="source" onclick="destination.appendChild(this)">click me</div>
<div id="destination" >...</div>
For the sake of completeness, there is another approach wrap() or wrapAll() mentioned in this article. So the OP's question could possibly be solved by this (that is, assuming the <div id="destination" /> does not yet exist, the following approach will create such a wrapper from scratch - the OP was not clear about whether the wrapper already exists or not):
$("#source").wrap('<div id="destination" />')
// or
$(".source").wrapAll('<div id="destination" />')
It sounds promising. However, when I was trying to do $("[id^=row]").wrapAll("<fieldset></fieldset>") on multiple nested structure like this:
<div id="row1">
<label>Name</label>
<input ...>
</div>
It correctly wraps those <div>...</div> and <input>...</input> BUT SOMEHOW LEAVES OUT the <label>...</label>. So I ended up use the explicit $("row1").append("#a_predefined_fieldset") instead. So, YMMV.
The .appendChild does precisely that - basically a cut& paste.
It moves the selected element and all of its child nodes.