Find Data in jquery - javascript

I'm currently working on my Stretchbox Plugin and trying to optimize and shorten the code.
I've used the jquery data method to attach data to certain divs.
For instance:
$('#thumbs div:last-child').data('active', true)
which sets a certain div to the active state.
If i know want to find this div, i have to check each .thumb class
in order to find it:
$('.thumb').each(function() {
if($(this).data('active')){
//Do Stuff
}
}
This works fine, but I'm quite sure there should be a much easier way, since checking up every single .thumb div(out of 10-30) will take some performance too.

$(".thumb[data-active='true']");

As far as I know there is no other way to do it. You could, however, create a new jQuery selector. I was going to give it a shot, but it looks like someone has already thought of it (scroll down to "Querying element data").
It will allow you to do things like this:
$(':data(active)'); //Selects all elements with "active" data
It probably won't be faster, but it might make your code neater!

Am I missing something? Just save it in a variable:
jQuery(function($){
var activeDiv = [];
$('#selector').click(function(){
activeDiv = $('#thumbs div:last-child')
...
});
$('#executor').click(function() {
activeDiv.each(function() {
...
});
}
});

Related

Jquery script not working to alter CSS on change

I've added some custom elements to be included with my WooCommerce account page to be seen with the order history. Unfortunately the page is setup with tabs to only display the information pertaining to the active tab.
I'm not very familiar with jquery, but I thought it would be simple enough to use Jquery to hide the divs I added when the order history has a display of none.
I added the following script to my theme's main.js file:
$(document).ready(function(){
var display = $('.my_account_orders');
if(display.css("display") == "none") {
$('.paging-nav').css("display","none");
}
});
When the class .my_account_orders has a display of none it should change the div I added (.paging-nav) to have a display of none. But it just doesn't work.
Is there something wrong with this script or do I need to do something special to initiate it? Since it's in my theme's main.js file and I used $(document).ready(function() I figured it would just load with the page.
Any help with this would be greatly appreciated.
Instead of using:
var display = $('.my_account_orders');
Implement it into the if statement like this:
if($('.my_account_orders').css("display") == "none") {
Because originally it is trying to find a variable called $display, so it would return a syntax error of undefined.
You've got an errant $ in your if statement. This should work instead:
$(document).ready(function(){
var display = $('.my_account_orders');
if(display.css("display") == "none") {
$('.paging-nav').css("display","none");
}
});
Also keep in mind that your var display is only going to match the first element that has a class of my_account_orders, so if there are multiple elements with that class, and they don't all have the same display, you could get unexpected results.
Try this:
$(document).ready(function(){
var display = $('.my_account_orders');
if(display.css("display") == "none") {
$('.paging-nav').css("display","none");
}
});
I believe it's a very lame way to check for a css property such as display to determine if an element is hidden or not. With jquery, you can make use of :hidden selector which determines whether an element is hidden and return a bool value.
$(document).ready(function(){
if($('.my_account_orders').eq(0).is(":hidden")) // eq(0) is optional - it basically targets the 1st occurring element with class 'my_account_orders'
{
$('.paging-nav').css("display","none");
}
});
Example : https://jsfiddle.net/DinoMyte/sgcrupm8/2/

Change multiple div contents on another div mouse hover without css/with an xml source file

I'm working on this site, and I need to change the contents of image_preview, title_preview, description_preview, link_preview according to what I'm hovering over (ex: mouse hover "button_a" = image1.png, iliketitle, ulikedesc, welikelink).
I've tried using css solutions like this and this, but I wasn't able to make them work like I needed.
Since the page will have many button_#'s (50-100 buttons), I think css isn't a proper choice.
So what I'm looking for is a way to do this without css, better if with an xml source file, so it'd be easier to manage the content to display for each button. I only found this talking about the xml I'd need, but I'm not sure that's exactly what I need.
Your buttons have a class (e.g. .btn) and the associated data to each button is store somewhere, let's say each button has a data-* attribute which points to the right data.
$('.btn').hover(function() {
var data = $(this).data('something');
if(data == "b1") {
//assign the values related to b1
}
else if(data == "b2") {
//assign the values related to b2
}
//and so on
}
If you have a lot of buttons like that, then the data can be a reference to an array containing the proper info.
Here's a jsfiddle DEMO.
And here's updated DEMO.
EDIT:
.hover() can take two handler which the second will handle when mouse is out of the element.
yourElement.hover(
function() {
//mouse is on the element, do stuff
},
function() {
//mouse is out, do other stuff
}
);
You can have a function to set the default values and call that in hover's second function.
jsfiddle DEMO

Finding $(this) after a function

So here's my problem: I'm using a function and I need the function to be specific to each tr with the class "middleone". It's supposed to change the insides of a div inside of the the tr with the class "middleone". But it's not working!
I know the recursive portion of it is working, and the "navigation" should be spot on, because even when i'm using just $(this) it doesn't do anything. When using document.getElementById it works fine but of course that only targets the first div and the full version of the code has to "Go here, pull from here, put it here, go to the next area, pull from here.. etc" Here's the testing code.
$('.middleone').each(function() {
var tripleeagain = $(this).find('div')
tripleeagain.innerHTML = "$";
});
Thanks for any help
tripleeagain is a jquery object collection upon which you should use html() instead of innerHTML
Basically you could just write:
$('.middleone').find('div').html("$");
If you are doing specific stuff inside the loop then:
$('.middleone').each(function() {
//Some specific logic
var tripleeagain = $(this).find('div').html("$");
});
The problem is you are trying to access native API from a jQuery object.
var tripleeagain = $(this).find('div');// this will return a jQuery object
So you should use the jQuery API for setting the html contents
tripleeagain.html("$");
jQuery html API documentaion

jQuery .html() | Will it include inline style?

Say I have something like this setup.
<div id="error">
<p style="color:green">Success.</p>
<p style="color:red">Failure.</p>
<p style="color:green">Success.</p>
</div>
and in my javascript I run something like this.
var response = $('#error').html();
if (response.indexOf('red') === -1) {
/*do stuff if #error has no style tags that have the color:red*/
}
Will that work or do I need to go about doing this a different way? I'd like some insight, thanks.
So how should I go about this if thats not the best way?
The best way (or a better way) would be to give a failure class to p elements rather than trying to check against styles. But if you have no choice...
DEMO
There are various ways, the first one is closer to your initial line of thoughts:
if ($('#error > p[style*="color:red"]').length) {
console.log('red');
}
A different approach which is slightly better in my opinion:
var redPs = $('#error > p').filter(function () {
return this.style.color === 'red';
});
if (redPs.length) console.log('red again');
Yes it will take inline CSS. If you have tried opening up a console, you have known that.
However seeing your need. I recommend using Jquery data attribute. Passing jQuery data attribute you can find whether the message is an error or success.

Add multiple elements to a single var and detect if any of those are clicked?

I have a page that can have one of three possible elements. I would like to assign whatever element exists to a var and then check if the var is clicked.
I tried using the add(), but it has confused me:
var testingVar = $('#element-one').find('.object').add('#element-two').find('.object').add('#element-three').find('.object');
$(testingVar ).click(function() {
alert('works');
});
It seems to me that the add() overwrites the previous add()? if I am on a page that has #element-three, it works, if on a page with element-one or element-two, it doesn't. If I change the var to
var testingVar = $('#element-one').find('.object');
Then a page with element-one works.
Can someone help me understand how to use the add() properly in this case?
Thanks
I think what you're looking for is this:
$('#element-one .object').add('#element-two .object').add('#element-three .object');
.find() returns a new jquery object.
However, I think this would be easier in this case:
$('#element-one .object, #element-two .object, #element-three .object');
Or even easier, if you can change markup, is to give each element you're currently selecting by id a common class, and do this:
$('.common-class .object')

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