jQuery :has selector filter trouble - javascript

I have some containers with ids="container1", "container2", "container3"...
They can have one of two types of tags inside: tables or canvas.
I want to hide one of them depending on the device orientation.
I have tried with this
$('[id^=container]:has(canvas)').hide();
or
$('[id^=container]:has(table)').hide();
but both hide all the containers, don't filtering their inside tags.

You can do
var x = $('[id^=container]').find("table").length;
// Will be 0 if no table inside it
if(x==0) { .. }
else { .. }

You can use classes on your containers instead of ids. Here's a JSFiddle demo.
For better performance in modern browsers, use $( "your-pure-css-selector" ).has( selector/DOMElement ) instead.
Source: https://api.jquery.com/has-selector/
Basically I made a 3 containers. One with a table, one with a canvas and one with nothing.
<div class="container green">
<table></table>
</div>
<div class="container blue">
<canvas></canvas>
</div>
<div class="container red"></div>
And a quick CSS to have the divs visible.
div.container{
display: inline-block;
height: 50px;
margin: 10px;
width: 50px;
}
div.green{
background-color: green;
}
div.blue{
background-color: blue;
}
div.red{
background-color: red;
}
And to complete it, a jQuery that executes when the document is ready.
$(document).ready(function(){
$('div.container').has('canvas').hide();
});

If you know the element by which you want to grab the container is not nested within additional tags, you can use the parentNode property of an HTML element to climb up the DOM tree and hide the parent.
document.querySelector("[id^=container] > table").parentNode.style.display= "none";
Example that demos the concept:
document.getElementById("input").addEventListener("change", function() {
document.getElementById("container1").style.display = "block";
document.getElementById("container2").style.display = "block";
document.querySelector("[id^=container] > " + this.value).parentNode.style.display = "none";
});
#container1 {
border: 1px solid red;
}
#container2 {
border: 1px solid blue;
}
<select id="input">
<options>
<option value="table">Hide the table</option>
<option value="canvas">Hide the canvas</option>
</options>
</select>
<div id="container1">Table
<table></table>
</div>
<div id="container2">Canvas
<canvas></canvas>
</div>

I didn't realized I had a global container with id= "container*".
What a silly mistake. Sorry for stealing your time, and thank you everyone!

Related

How to use each() with mouseenter, mouseover and data attributes right

I have a block which has some data attributes:
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
Now I want to use javascript for changing text color on mouseenter and mouseover using my data attributes.
So I have:
$(".my-div").each(function() {
$(this).mouseenter(function() {
$(this).css('color', this.dataset.hover);
});
$(this).mouseleave(function() {
$(this).css('color', this.dataset.color);
});
});
If I have one div, it's working fine, but if I have another divs with the same class, and I mouseenter and mouseover one div, another divs react too.
What should I do to make it working right, maybe add an index, I don't know.
Can you help me, please?
Thanks in advance. Sorry for my English.
P.S. Don't advise css, for this I must use javascript.
Your code should work by itself but you don't need to loop through each div to check if the mouse has entered or left each div element - it's extremely inefficient.
So remove:
$(".my-div").each(function() {});
Your new code should look like the following:
$(".my-div").mouseenter(function() {
$(this).css('color', this.dataset.hover);
});
$(".my-div").mouseleave(function() {
$(this).css('color', this.dataset.color);
});
.my-div {
position: relative;
display: inline-block;
width: 100px;
height: 100px;
color: #ff4b4b;
border: 1px solid #000000;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
Obviously the CSS isn't necessary but I have added it to prove that it works correctly.
Get the target element of the event passed into each handler using $(this):
$(".my-div").each(function() {
$(this).mouseenter(function(e) {
$(this).css('color', this.dataset.hover);
});
$(this).mouseleave(function(e) {
$(this).css('color', this.dataset.color);
});
});
.my-div{
font-size: 20px;
line-height: 25px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="my-div" data-color="black" data-hover="red">
Text 1
</div>
<div class="my-div" data-color="black" data-hover="green">
Text 2
</div>
<div class="my-div" data-color="black" data-hover="blue">
Text 3
</div>

Limit selectable divs in a parent div

I'd like to create a product feature selection page where the user needs to select 3 features out of 6. Now, I got to a point where I can limit the number of selectable elements so if 3 elements are selected, the user wont be able to select a 4th one.
I need to modify this so when the user is attempting to select the 4th element, the 1st element they selected becomes unselected and the 4th element becomes selected. I hope it makes sense.
$('div').click(function(e) {
var $et = $(e.target);
if ($et.hasClass('fill')) {
$et.removeClass('fill');
} else {
if ($('.fill').length < 2) {
$et.addClass('fill');
}
}
});
div {
border: 1px solid blue;
height: 25px;
margin-bottom: 5px;
}
.fill {
background-color: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<div id="1">one</div>
<div id="2">two</div>
<div id="3">three</div>
<div id="4">four</div>
This fiddle shows where I'm at with my code: http://jsfiddle.net/MarKP/32/
This fiddle is not mine, but this is exactly what I have right now in my project.
I'm trying to get this done using jQuery or plain JavaScript.
Thank you in advance!
To achieve this you can maintain an array which holds the order in which the elements were clicked. Then, when the limit is hit, you can remove the class from the element which was selected first. Try this:
var selections = [];
var $div = $('div').click(function(e) {
selections.push(this.id);
if (selections.length > 3)
selections.shift(); // remove first item
setState();
});
function setState() {
$div.removeClass('fill');
$div.filter(`#${selections.join(',#')}`).addClass('fill');
}
div {
border: 1px solid blue;
height: 25px;
margin-bottom: 5px;
}
.fill {
background-color: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="1">one</div>
<div id="2">two</div>
<div id="3">three</div>
<div id="4">four</div>
<div id="5">five</div>
<div id="6">six</div>
Finally, note that jQuery 1.4.4 is massively outdated; nearly 10 years in fact. You need to update it.

CSS nth-child doesn't work on dynamically hidden element [AngularJS]

I'm trying to implement CSS nth-child on every number of elements. If a certain number is reached I want to hide the first element and make it reappear if the number reduces again.
The problem is that somehow the nth-child still counts the hidden element and thus wrongly implements the styling. Is this a bug or am I doing it wrong?
NOTE: The same thing also happens if I use jQuery
http://jsfiddle.net/bedex78/uZ5wn/23/
The View:
<div ng-app>
<div ng-controller="TheCtrl">
<p>Amount to add: <input type="text" ng-model="amount" ng-init="amount=1"></p>
<div class='holder'>
<div ng-class='elements.length < 6 ? "inside" : ""'
ng-hide="elements.length >= 6">
<button class='button' ng-click="add(amount)">Add more</button>
</div>
<div class='inside' ng-repeat="(k,v) in elements">
{{ $index }} Remove
</div>
</div>
</div>
</div>
The JS (AngularJS):
function TheCtrl($scope) {
$scope.elements = [{id:1},{id:2}]
$scope.add = function(amount) {
for (i=0; i < amount; i++){
$scope.elements.push({id:$scope.elements.length+1});
}
};
$scope.remove = function(index) {
$scope.elements.splice(index, 1);
};
}
The CSS:
.holder {
width: 300px;
height: 400px;
border: 1px solid black;
}
.inside {
height: 30px;
border: 1px solid black;
}
.inside:nth-child(3n+1) {
background-color: yellow;
}
.inside a {
float: right;
}
It happens because hidden element is still in DOM. So it is count as a child and styles applied accordingly.
You can try to use ng-if instead of ng-hide. It will make div disappear from DOM and styles will work fine.
Example

How do I tell CSS to recalculate :first-of-type after DOM dynamically changes?

I have the following CSS rules:
.block:first-of-type{
border-top: 1px solid black;
}
.block:last-of-type{
border-bottom: 1px solid black;
}
This .block div is generated via AJAX and can be added multiple times to the page. The problem is that every time I add one of them, all divs are read as both first and last of the document. I assume it is because the CSS doesn't recognize the changes that happen in the DOM. How do I fix this?
all divs are read as both first and last of the document
You misunderstand what :first-of-type and :last-of-type mean.
See the spec
Same as :nth-of-type(1). The :first-of-type pseudo-class represents an element that is the first sibling of its type in the list of children of its parent element.
The important bit is children of its parent element not document.
You can see it does that quite correctly here:
function middle() {
var d = document.createElement("div");
d.appendChild(document.createTextNode("inserted in middle"));
var p = document.querySelector("div + div + div");
p.parentNode.insertBefore(d, p);
}
function first() {
var d = document.createElement("div");
d.appendChild(document.createTextNode("inserted at top"));
var p = document.querySelector("div");
p.parentNode.insertBefore(d, p);
}
setTimeout(middle, 2000);
setTimeout(first, 4000);
div:first-of-type {
border-top: 1px solid black;
}
div:last-of-type {
border-bottom: 1px solid black;
}
<div>Original First</div>
<div>Original Second</div>
<div>Original Third</div>
<div>Original Fourth</div>
<div>Original Fifth</div>
You are, presumably creating a structure such as:
<div>
<div class="block"></div>
</div>
<div>
<div class="block"></div>
</div>
<div>
<div class="block"></div>
</div>
… in which every div of that class is the first div in its parent element.
Given that layout then you would need something more akin to :first-of-type > .block as your selector.
The precise nature of the selector you need would depend on the DOM you are creating, but you haven't shared that with us.

document.getElementById returns null for my drop-down select menu

I am trying to create a drop-down select menu with custom css (similar to the drop-down selection of language at http://translate.google.com/#).
I have current html code:
<ul id="Select">
<li>
<select id="myId"
onmouseover="mopen('options')"
onmouseout="mclosetime()">
<div id="options"
onmouseover="mcancelclosetime()"
onmouseout="mclosetime()">
<option value="1" selected="selected">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</div>
</select>
</li>
</ul>
and the Javascript:
function mopen(id)
{
// cancel close timer
mcancelclosetime();
// close old layer
if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
// get new layer and show it
ddmenuitem = document.getElementById(id);
ddmenuitem.style.visibility = 'visible';
}
But document.getElementById returns null.
Though if I use the code with a div element that does not contain a select list the document.getElementById(id) returns proper div value.
How do I fix this? or is there a better way to create drop-down select menu like http://translate.google.com ?
You've got your div placed inside of the select tag. I'm not sure this is valid, try moving the div outside of the select tag. As far as a better way, the dropdown at the link you've provided isn't using a select tag at all. It is simply styled to look like a dropdown menu, and is using a hidden div with all of the links inside of it. I hope this helps! --> here's some free code to get you started. The CSS triangle trick comes at no extra charge ;)
<div id='fakeDropdown'>
<div class='triangle'> </div>
<div id='menu'>
<a href='#'> link </a>
<a href='#'> link </a>
<a href='#'> link </a>
<a href='#'> link </a>
</div>
</div>
CSS
#fakeDropdown{
background-color: #888;
height: 30px;
width: 150px;
cursor: pointer;
}
#menu{
display: none;
background-color: #888;
height: 200px;
width: 800px;
position: relative;
top: 30px;
}
.triangle{
font-size: 0px; line-height: 0%; width: 0px;
border-top: 20px solid #000;
border-left: 10px solid #888;
border-right: 10px solid #888;
float: right;
margin-top: 5px;
}
JAVASCRIPT(assuming you're using jQuery)
$(document).ready(function(){
$('#fakeDropdown').hover(function(){
$(this).find('#menu').show('fast');
});
$('#fakeDropdown').mouseleave(function(){
$(this).find('#menu').hide('fast');
});
});
JSfiddle example
If you want a dropdown like Google Translate's, just look through the source code! There is no <select> element. It's almost entirely CSS.
http://jsfiddle.net/mattball/BA4v3/1/
That's because you can't nest a div tag within a select tag.
Google's fancy drop down is not a select tag at all, it's a set of div elements with the appropriate Javascript to accomplish something similar to a classic select element.
You'll need to change up your markup a bit for this to work out.
Here's a bunch of links to jQuery plugins/tutorials for creating custom drop-down menus.
http://vandelaydesign.com/blog/web-development/jquery-drop-down-menus/
http://www.hv-designs.co.uk/tutorials/sliding_menu/sliding_menu.html
http://www.filamentgroup.com/lab/jquery_ipod_style_and_flyout_menus/
check the value of alert(id):
alert(id);
ddmenuitem = document.getElementById(id);

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