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Store a selector in a variable Javascript and then use a method on it

I have check some others post, and document myself but I dont know what is the problem here.
I have 2 image (would like to have like 20 at the end) where you can click on an icon and show and hide and image in the webpage. If you click on image A it should show image A, if you click on image B image A should hide and image B should be sown.
var firsttime = 1;
var $lastletter;
$(function() {
$('#A').click(function() {
if (firsttime = 0){
$lastletter.toggle();
$('#AL').toggle();
$lastletter = $( '#AL' );
}
else
{
firsttime = 0;
$('#AL').toggle();
$lastletter = $( '#AL' );
}
});
});
$(function() {
$('#B').click(function() {
if (firsttime = 0){
$lastletter.toggle();
$('#BL').toggle();
$lastletter = $( '#BL' );
}
else
{
firsttime = 0;
$('#BL').toggle();
$lastletter = $( '#BL' );
}
});
});
This is the solution im using:
$(function() {
$('.imgLetter').click(function() {
if (lastletter != this.id) {
$('#' + lastletter + 'L').toggle();
lastletter=this.id;
}
$('#' + this.id + 'L').toggle();
});
});

Assuming you're conventionally assigning the "last letter" by appending an "L" to the ID: this could get a lot simpler. Decorate all of your #<x> elements with a class name that makes it easy to select all of them at once. I'm going to choose "letter".
I don't think you even need to track the "first time". It sounds like you just want one element to toggle another. That would look like:
$(function() {
$('.letter').click(function() {
$('#' + this.id + 'L').toggle();
});
});

Repeatable block functionlaity

I am trying to develop functionality for repeatable blocks within my web form, the issue being the buttons do nothing when I click them I have tested them in the console and they do work, they just dont do anything and am unsure why, been working on this for 2 days and am at a standstill, anyone who can point me in the right direction would be much appreciated.
It should generate the fields contained within that field set and generate a identical empty field set, and not sure whats wrong with the plus or minus functions.
$('input, fieldset').each(function(){
if ($(this).attr('data-maxOccurs') != 1){
$(plusMinusButtons).insertAfter(this);
}
});
$('.glyphicon-plus-sign').hover(function(){
$(this).addClass('green');
},
function(){
$(this).removeClass('green');
}
);
$('.glyphicon-minus-sign').hover(function(){
$(this).addClass('red');
},
function(){
$(this).removeClass('red');
}
);
$('body').on("click", '.glyphicon-plus-sign', function (){
prevInput = $(this).prev('input');
count = $(prevInput).attr('data-count');
countIncremented = count++;
br = '<br/><br/>';
inputElement = '<input type="'+$(prevInput).attr("type")+'" name="'+$(prevInput).attr("name")+countIncremented+'" data-count="'+countIncremented+'"/>';
$(br + inputElement + plusMinusButtons).insertAfter('.'+$(prevInput).attr("name")+':last');
}
);
$('body').on("click", '.glyphicon-minus-sign', function (){
prevInput = $(this).prev('input');
$(this).remove(prevInput).remove(this);
}
);
$("button").click(function(){
console.log("here");
x=$('#form').serializeArray();
$.each(x, function(i, field){
console.log(field.name + ":" + field.value + " ");
});
});
});
And here is the JSfiddle: Fiddle

The code Used in order to duplicate the field set.
$('body').on("click ", '.glyphicon-plus-sign', function() {
console.log("here ");
prevInput = $(this);
count = $(prevInput).attr('data-count=')||0;
countIncremented = count++;
br = '<br/><br/>';
$($(this).parent()).clone().insertAfter($(this).parent());

dynamically disabling/enabling a textbox

I'm having a problem trying to make this code work. The purpose is simply to enable a textbox when the option "Bus" is selected from a DropList.
At the moment I have a for loop running through and disabling all the necessary boxes (there are 15 identical rows). At the same time it is enabling a different function which is based on changing the selection in the same box, which works. Whereas the function in question doesn't work.
Here is the function:
$(function () {
for(var i=0;i<15;i++){ //loop through each of the rows
$("#Select" + i + "Box_C").change(callbackFactory(i)); //This is a working function
$("#Select" + i + "Box_C").change(toBus(i)); //This one isn't working
$("#Text" + i + "Box_Q1").prop('disabled', true); //this one is working
};
function busEnabler(num){
$("#Text" + num + "Box_Q1").prop('disabled', false);
};
function toBus(numm){
var jk = numm //Closures confuse me
if ($("#Select" + numm + "Box").val() === "Bus"){
$("#Text" + numm + "Box_Q1").prop('disabled', false);
console.log(jk);
busEnabler(jk);
}
else {
$("#Text" + numm + "Box_Q1").prop('disabled', true);
console.log($("#Select" + numm + "Box_C") + "=" + $("#Select" + numm + "Box_C").val());
}
};
});
The ID's are made up (the real ones are horribly named - not my choosing) so if there is a typo in the ID's it's irrelevant.
Also as a side note I can't seem to log anything to the console after the page has loaded (using FireBug).
callbackFactory:
function callbackFactory(i){
console.log('changing');
return function(){
transportChange($("#_Q0_Q"+ i +"_Q3_C").val(), i);
};

The problem is in the way you are attaching the onchange events.
The following statement (that you have used) does not attach any method.
$("#Select" + i + "Box_C").change(toBus(i));
So whenever the value of the select box changes, the 'toBus' method is never called.
I have created a Fiddle. Please refer that.
JSFiddle

Use the following code for your purpose and please show the function callbackFactory also, so that I can resolve your complete problem.
$(doucment).on('change', 'select[id^=Select]',function() {
$('input[id^=Text]').prop({disabled:true});
var id = $(this).attr('id');
var txtId = id.replace('Select','Text').replace('Box','Box_Q1');
if($(this).val() == 'Bus') {
$('#'+txtId).prop({disabled:false});
}
});

Jquery adding forms, works on JSFiddle but in production does not

Hi guys this might be a really stupid error but im using jquery to add a formset to a page it also does other things such as updating the number of forms but that does not seem to be a issue.
http://jsfiddle.net/b5Y8f/
$(document).ready(function () {
function updateElementIndex(el, prefix, ndx) {
var id_regex = new RegExp('(' + prefix + '_set-\\d+-)');
var replacement = prefix + '_set-' + ndx + '-';
if ($(el).attr("for")) $(el).attr("for", $(el).attr("for").replace(id_regex, replacement));
if (el.id) el.id = el.id.replace(id_regex, replacement);
if (el.name) el.name = el.name.replace(id_regex, replacement);
}
function changeDeleteForms(el, prefix, formid) {
var idstring = 'id_' + prefix + '_set-' + formid + '-DELETE';
//$('<input>').attr({type: 'hidden', id: 'id_' + idstring, name: idstring}).appendTo('.command-delete');
$('#' + idstring).prop('checked', true);
}
function deleteForm(btn, prefix) {
var formCount = parseInt($('#id_' + prefix + '_set-TOTAL_FORMS').val());
if (formCount > 1) {
// Delete the item/form
$(btn).parents('.command').hide();
$(btn).parents('.command').attr('class', 'command-delete');
var dc = $(".command-delete");
$(dc).children().children().children().each(function () {
var formid = this.id.match(/\d+/g);
changeDeleteForms(this, prefix, formid);
//$(this).val("");
});
var forms = $('.command'); // Get all the forms
var formsdelete = $('.command-delete'); // Get all the forms
var fl = parseInt(forms.length);
var fdl = parseInt(formsdelete.length);
var finalcount = fl + fdl
// Update the total number of forms (1 less than before)
//$('#id_' + prefix + '_set-TOTAL_FORMS').val(forms.length);
var i = 0;
} // End if
else {
alert("Please enter atleast 1 command for this item.");
}
return false;
}
function addForm(btn, prefix) {
var formCount = parseInt($('#id_' + prefix + '_set-TOTAL_FORMS').val());
var maxCount = parseInt($('#id_' + prefix + '_set-MAX_NUM_FORMS').val());
var forms = parseInt($('.command-delete').length); // Get all the forms
var newcount = formCount + forms;
// You can only submit a maximum of 10 todo items
if (newcount < maxCount) {
// Clone a form (without event handlers) from the first form
var row = $(".command:first").clone(false).get(0);
// Insert it after the last form
$(row).removeAttr('id').hide().insertAfter(".command:last").slideDown(300);
// Remove the bits we don't want in the new row/form
// e.g. error messages
$(".errorlist", row).remove();
$(row).children().removeClass("error");
// Relabel or rename all the relevant bits
$(row).children().children().children().children().each(function () {
updateElementIndex(this, prefix, newcount);
$(this).val("");
});
// Add an event handler for the delete item/form link
$(row).find(".delete").click(function () {
return deleteForm(this, prefix);
});
// Update the total form count
$("#id_" + prefix + "_set-TOTAL_FORMS").val(newcount + 1);
} // End if
else {
alert("Sorry, you can only enter a maximum of 1000 items.");
}
return false;
}
// Register the click event handlers
$("#add").click(function () {
return addForm(this, "itemcommands");
});
$(".delete").click(function () {
return deleteForm(this, "itemcommands");
});
$('.command input:checkbox').hide();
});
If you go to the link above you can see the code works perfectly fine it update the form count and add the new form with the new number in the id and everything however in production when you click the add command button for the first 3 times it does not show however the code has been enter into the page and the form is technically there but not shown.
on the fourth time you press the button it works and the row has been added after the last ('.command') in the element.
What could be causing it to work on JSFiddle but not on production?
-------------------UPDATE--------------------------
It seems if i remove the overflow hidden from the 3 that dont show when you press the button the first 3 times it will show them in the correct place.
Why would overflow no be removed from the first 3 form rows but the rest after fine?
----------------------UPDATE--------------------------
Think i have found the issue and its nothing to do with the JQUERY at all it seems to be bootstraps responsive layout hiding the forms i think if i add them specifically to their own rows i can fix this.
Thanks for the help though guys.

I don't see a src="*jQuery source*" in your file. Since JSFiddle already adds the source to the file, you may have forgotten to put it in.

jQuery slideToggle & cookie

I have a page which is dynamically generated and uses slideToggle to open and close the hierarchical divs etc no problem. The only problem is, everytime I postback I have to generate the divs again and they lose their opened/closed state. They are always generated with the same unique ids.
I would like to use the cookie plugin to remember the states when I call my sltoggle function and then when the page reloads expand all the same divs. Heres what i've got so far...
$(document).ready(function ()
{
$(".toggle-hide").hide();
//something in here about opening the divs in the cookie
});
function sltoggle(eID)
{
$("div[id$='" + eID + "']").slideToggle(600);
//I think the below code is okay - I copied it from a working example ^^
var divState = ($("div[id$='" + eID + "']").css('display') == 'block') ? 1 : 0;
$.cookie("divState", state)
}

Comment explanations inline.
function slToggle(eID) {
var $div = $("div[id$='" + eDI + "']");
//Get value of cookie or empty string
//Cookie is list of eIDs that should be visible
var cooks = $.cookie("divState") || '';
//Determine whether eID is already in the cookie
var isin = $.inArray(eID, cooks.split(','));
//TODO verify that .is("visible") check works during
//toggle animation. Otherwise, this code goes in the
//toggle animation callback function
if ($div.slideToggle(600).is(":visible")) {
//Div is visible, but not in cookie
if (!isin) {
$.cookie("divState", cooks + (cooks ? ',' : '') + eID);
}
}
else if (isin) {
//Div not visible, but in cookie
$.cookie("divState", cooks.replace(/(^|,)eID(,|$)/, ''));
}
}