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Making part of an Id name into a variable

I have a bunch of divs with matching ids (#idA_1 and #idB_1, #idA_2 and #idB_2, etc). In jquery I wanted to assign click functions, so that when I click an #idA it will show and hide an #idB.
Basically I want to make this:
$(".idA_x").click(function(){
$("idB_x").toggleClass("hide")
});
X would be a variable to make #idA and #idB match. I could write each individually, but that would take too much code, is there a way to make the number in the id into a variable?

Sure, you can do:
var num = 13;
addButtonListener(num);
function addButtonListener(num){
$("#idA_"+num).click(function(){
$("#idB_"+num).toggleClass("hide")
});
}

Try JQuery solution :
var x = 1;
$(".idA_" + x ).click(function(){
$(".idB_" + x ).toggleClass("hide")
});
Hope this helps.

There are many ways to achieve that, but what you probably want is to create a shared CSS class, e.g. .ids, and bind the event listener to that one:
$('.ids').click(function () {
//...
});
Then you can handle your logic in a cleaner way within the function body.

In order to make it dynamic, and not have to repeat the code for each one of your numbers, I suggest doing as follows:
First, add a class to all the div's you want to be clickable .clickable, and then use the id of the clicked event, replacing A with B in order to select the element you what to toggle the class:
$(".clickable").click(function(){
var id = $(this).attr('id');
$("#" + id.replace('A', 'B')).toggleClass("hide");
});
Or, you can also select all divs and use the contains wildcard:
$("div[id*='idA_']").click(function(){
var id = $(this).attr('id');
$("#" + id.replace('A', 'B')).toggleClass("hide");
});
This solution won't have the need to add a class to all clickable divs.

You can use attribute selector begins with to target the id's you want that have corresponding elements.
https://api.jquery.com/attribute-starts-with-selector/
Then get the value after the understore using split on the id and applying Array.pop() to remove the 1st part of the array.
http://jsfiddle.net/up9h0903/
$("[id^='idA_']").click(function () {
var num = this.id.split("_").pop();
$("#idB_" + num).toggleClass("hide")
});
Using regex would be your other option to strip the number from the id.
http://jsfiddle.net/up9h0903/1/
$("[id^='idA_']").click(function () {
var num = this.id.match(/\d+/g);
$("#idB_" + num).toggleClass("hide")
});

Jquery: Replace a part of each attribute [duplicate]

Do someone know what is the best way to replace some string inside a onclick attribute ?
I need to get the current value and replace some text inside parameters.
Exemple, I have this link:
My link
And I want this:
My link
In other words, I want something like this:
$('a').attr('onclick', $(this).attr('onclick').replace('1', '2'));
And I know I can do this, but I need something dynamic retreiving the values of current element:
$("a").attr('onClick', "myfunction('parameter2a','parameter2b')");
Finally it working when I made a simple demo: http://jsfiddle.net/GkWhh/4/
Thank you for your solutions !

$('a[onclick]').attr('onclick', function(i, v){
return v.replace(/1/g, '2');
});
http://jsfiddle.net/cj9j7/
If you need something more dynamic do not use onclick attributes, changing onclick attributes is hackish, you can use click method instead.
var param = 1;
$('a').click(function(){
// ...
if ('wildguess') {
param = 1;
} else {
param++;
}
})

sounds like a really bad idea but anyway - you can access the string value of the onlick attribute using something like that:
$('a').each(function() { this.attributes.onclick.nodeValue = this.attributes.onclick.nodeValue.replace('1', '2'); })

You can do this: http://jsfiddle.net/SJP7k/
var atr = $('a').attr('onclick');
var str = atr.split('1');
var natr = str.join('2');
$('a').attr('onclick',natr);

Get DIV ID where Class is selected?

I currently have the following:
$(window).load(function(){
$(".boxdiv").click(function () {
$(this).toggleClass("selected");
});
});
Which perfectly does the first part of what I need. I have a fair amount of div's with the class "boxdiv" and they each have a unique ID that will identify it. What I need to happen is to have some kind of button that when pressed sends all of these div ID's with the class selected, to the next page.
Anyone got any idea of how I can do this?

Map the ID's in an array, and use $.param to create a querystring
$('button').on('click', function() {
var id_arr = $.map($(".selected"), function(el) {return el.id;});
window.location.href = '/next_page?' + $.param({ids : id_arr});
});
EDIT:
$('button').on('click', function() {
var id_arr = $.map($(".selected"), function(el) {return el.id;}),
qs = encodeURIComponent(id_arr.join(','));
window.location.href = '/next_page?ids=' + qs;
});

Perhaps this is what you're looking for:
$(".button").click(function(){
var id_arr = [];
$(".boxdiv").each(function(){ // Loop through each element with that class
id_arr.push($(this).attr('id'));
}); // Loop through each element with that class
});
window.location = 'next.html/ID=' + id_arr.join(',');
The ID's should be stored in id_arr

You can loop over each div that has the class selected. You can then use attr() to access the ID names.
Javascript
var ids = [];
$.each($(".selected"), function() {
ids.push($(this).attr('id'));
});
ids = ids.join(',');
HTML
<div id="boxA"></div>
<div id="boxB" class="selected"></div>
<div id="boxC" class="selected"></div>
<div id="boxD"></div>
This should return ["boxB", "boxC"]
See: http://jsfiddle.net/B4V28/1/

All of the answers submitted are in fact correct - but I think the real issue is your expectation of what jQuery is doing for you.
jQuery will gather all of the ID's in any manner, but you will need to have a way to collect them on the next page and actually do something with them. This will all need to happen server side.
Most likely, the ideal method, based on your comment of "potentially there could be many" you would want to do a mapping (see other answers), and pass the json object to your server, where it can pass it to the next page.
With the same code -
$('button').on('click', function() {
var id_arr = $.map($(".selected"), function(el) {return el.id;}),
qs = encodeURIComponent(id_arr.join(','));
alert('/next_page?ids=' + qs);
});
Here is a fiddle for you - http://jsfiddle.net/kellyjandrews/4dYfh/

How to change text inside span with jQuery, leaving other span contained nodes intact?

I have the following HTML snippet:
<span class="target">Change me <a class="changeme" href="#">now</a></span>
I'd like to change the text node (i.e. "Change me ") inside the span from jQuery, while leaving the nested <a> tag with all attributes etc. intact. My initial huch was to use .text(...) on the span node, but as it turns out this will replace the whole inner part with the passed textual content.
I solved this with first cloning the <a> tag, then setting the new text content of <span> (which will remove the original <a> tag), and finally appending the cloned <a> tag to my <span>. This works, but feels such an overkill for a simple task like this. Btw. I can't guarantee that there will be an initial text node inside the span - it might be empty, just like:
<span class="target"><a class="changeme" href="#">now</a></span>
I did a jsfiddle too. So, what would be the neat way to do this?

Try something like:
$('a.changeme').on('click', function() {
$(this).closest('.target').contents().not(this).eq(0).replaceWith('Do it again ');
});
demo: http://jsfiddle.net/eEMGz/
ref: http://api.jquery.com/contents/
Update:
I guess I read your question wrong, and you're trying to replace the text if it's already there and inject it otherwise. For this, try:
$('a.changeme').on('click', function() {
var
$tmp = $(this).closest('.target').contents().not(this).eq(0),
dia = document.createTextNode('Do it again ');
$tmp.length > 0 ? $tmp.replaceWith(dia) : $(dia).insertBefore(this);
});
​Demo: http://jsfiddle.net/eEMGz/3/

You can use .contents():
//set the new text to replace the old text
var newText = 'New Text';
//bind `click` event handler to the `.changeme` elements
$('.changeme').on('click', function () {
//iterate over the nodes in this `<span>` element
$.each($(this).parent().contents(), function () {
//if the type of this node is undefined then it's a text node and we want to replace it
if (typeof this.tagName == 'undefined') {
//to replace the node we can use `.replaceWith()`
$(this).replaceWith(newText);
}
});
});​
Here is a demo: http://jsfiddle.net/jasper/PURHA/1/
Some docs for ya:
.contents(): http://api.jquery.com/contents
.replaceWith(): http://api.jquery.com/replacewith
typeof: https://developer.mozilla.org/en/JavaScript/Reference/Operators/typeof
Update
var newText = 'New Text';
$('a').on('click', function () {
$.each($(this).parent().contents(), function () {
if (typeof this.tagName == 'undefined') {
//instead of replacing this node with the replacement string, just replace it with a blank string
$(this).replaceWith('');
}
});
//then add the replacement string to the `<span>` element regardless of it's initial state
$(this).parent().prepend(newText);
});​
Demo: http://jsfiddle.net/jasper/PURHA/2/

You can try this.
var $textNode, $parent;
$('.changeme').on('click', function(){
$parent = $(this).parent();
$textNode= $parent.contents().filter(function() {
return this.nodeType == 3;
});
if($textNode.length){
$textNode.replaceWith('Content changed')
}
else{
$parent.prepend('New content');
}
});
Working demo - http://jsfiddle.net/ShankarSangoli/yx5Ju/8/

You step out of jQuery because it doesn't help you to deal with text nodes. The following will remove the first child of every <span> element with class "target" if and only if it exists and is a text node.
Demo: http://jsfiddle.net/yx5Ju/11/
Code:
$('span.target').each(function() {
var firstChild = this.firstChild;
if (firstChild && firstChild.nodeType == 3) {
firstChild.data = "Do it again";
}
});

This is not a perfect example I guess, but you could use contents function.
console.log($("span.target").contents()[0].data);

You could wrap the text into a span ... but ...
try this.
http://jsfiddle.net/Y8tMk/
$(function(){
var txt = '';
$('.target').contents().each(function(){
if(this.nodeType==3){
this.textContent = 'done ';
}
});
});

You can change the native (non-jquery) data property of the object. Updated jsfiddle here: http://jsfiddle.net/elgreg/yx5Ju/2/
Something like:
$('a.changeme3').click(function(){
$('span.target3').contents().get(0).data = 'Do it again';
});
The contents() gets the innards and the get(0) gets us back to the original element and the .data is now a reference to the native js textnode. (I haven't tested this cross browser.)
This jsfiddle and answer are really just an expanded explanation of the answer to this question:
Change text-nodes text

$('a.changeme').click(function() {
var firstNode= $(this).parent().contents()[0];
if( firstNode.nodeType==3){
firstNode.nodeValue='New text';
}
})
EDIT: not sure what layout rules you need, update to test only first node, otherwise adapt as needed

How to get the id of an element on a button click in mootools(1.1)

I have a bunch of links with non-pre-determined id's like so:
Remove 123
Remove 234
Remove 567
Remove 890
I have an event handler like so:
$$('.remove_pid').addEvents({
'click': removePid
});
which calls this function
function removePid(event)
{
alert('yo what is my element id???');
}
So the question is how do i get the element id in the function removePid()?
UPDATE:
#Aishwar, event.target.id seems to work in the following case, but not specifically in my case
<img src="/123.jpg" id="pid_123">
UPDATE 2:
I thought it was inconsequential, but instead of the text "Remove 123" I actually have an image like so:
<img src="/123.jpg">
So, thanks for #Dimitra for pointing it out. I was surprised with the de-vote but am happy to say i probably deserve it.

I do not have experience working with mootools. But I would guess you can just do something along these lines, in removePid:
var element = event.srcElement || event.target
element.id // is the element's id, element is the DOM element itself

as per the markup posted in the FINAL update:
http://www.jsfiddle.net/dimitar/Sr8LC/
$$('.remove_pid').addEvents({
'click': function(e) {
new Event(e).stop();
var id = this.getProperty("id");
alert(id);
alert(id.replace("pid_", ""));
}
});
to use a named function and keep the event:
var removeProduct = function(e) {
new Event(e).stop();
var id = this.getProperty("id");
alert(id);
alert(id.replace("pid_", ""));
};
$$('a.remove_pid').each(function(el) {
el.addEvents({
'click': removeProduct.bind(el)
});
});
within both functions, this will refer to the trigger element (the anchor), so you can read it's property, etc. this.getFirst() will reference the image (if you want it).

Think I found it:
function removePid(event)
{
//alert('yo what is my element id???');
$(event.target).getParent('a').getProperty('id');
}
This works in FF 3.6