Develop Reference

if statement inside jQuery selector

I'm getting those 2 vars from the DOM:
var get_category = $('#category').find('.current').attr('rel');
var get_subcategory = $('#subcategory').find('.current').attr('rel');
and I want here to find the classes in my DOM and show it
$('.filter-result').find('.'+get_category, '.'+get_subcategory ).show();
But I need to write it inside the .find() only if the variables are exist

I hope it answers your question:
var get_category = $('#category').find('.current').attr('rel');
var get_subcategory = $('#subcategory').find('.current').attr('rel');
var classes = [];
if (get_category) {
classes.push('.' + get_category);
}
if (get_subcategory) {
classes.push('.' + get_subcategory);
}
//if get_category or get_subcategory were found
if (classes.length) {
$('.filter-result').find(classes.join('')).show();
}

I do like Gabriels answer because it is very simple another option that works well and is extensible all you would have to do add another selector is add it to the selectors array. It is a little bit more advanced using javascripts filter and map array methods though.
var get_category = $('#category').find('.current').attr('rel');
var get_subcategory = $('#subcategory').find('.current').attr('rel');
var selectors = [get_category, get_subcategory];
var query = selectors.filter(function(elem) {
if (elem) { return elem };
}).map(function(elem){
return '.' + elem;
}).join(', ')
$('.filter-result').find(query).show();

how to loop though div and get each value

I am trying to figure out how to get each value within my div. I am using
var cart = $('.basic-cart-cart-node-title.cell').text();
It is giving the results of OI-01OP-01OS-10-5SOR-04OR-05
I need to view them one by one: OI-01, OP-01, OS-10-5S, OR-04 OR-05.
So that I can match them against another field.
If you care to help me further, I have another div on the page:
var ParNum = $('.assess-title').text();
I would like to compare the values returned from the var cart and see if that value is in the ParNum. If it is there, I would like to apply a class.
Any help would be greatly appreciated.
Thanks!

You can store the values in an array using .map() method:
var values = $('.basic-cart-cart-node-title.cell').map(function() {
return $.trim( $(this).text() );
}).get();
For checking existence of the ParNum value in the array:
var does_exist = values.indexOf(ParNum) > -1;

Try this to iterate over elements:
var text = '';
$('.basic-cart-cart-node-title.cell').each(function (i, div) {
text += ' ' + $(div).text();
});
or this to get an array of matching div elements:
var divs = $('.basic-cart-cart-node-title.cell').toArray();
for (var i = 0; i < divs.length; i++) {
// $(div).text();
}
Reason for this is that $('.basic-cart-cart-node-title.cell') returns all div's at once, and you need to loop through the result. More specifically, $(selector) returns a so-called "wrapped set". It can be used to access each matching element (as I've shown above) or it can be used to apply any other jQuery function to the whole set at once. More info here.

var text = "";
$('.basic-cart-cart-node-title.cell').each(function(){
text += $(this).text() + ", ";
});
// remove the last ", " from string
text = text.substr(0, text.length -2);

var cart = [];
$('.basic-cart-cart-node-title.cell').each(function {
cart.push($(this).text());
}

This performs the matching and class adding you mentioned in the question.
var ParNum = $('.assess-title').text();
$('basic-cart-cart-node-title.cell').each(function () {
if ($(this).text() == ParNum) {
$(this).addClass("someclass");
}
}

You should try using
var cart ='';
$('.basic-cart-cart-node-title'.find('.cell').each(function()
{
cart = cart + $(this).val();
});
Hope it works for you.

var cart = $('.basic-cart-cart-node-title.cell').text().match(/.{5}/g);
This will give you an array with items 5 chars long. Regexes arent very fast, but a loop might be slower
Or easier to read, and in a string with commas:
var cart = $('.basic-cart-cart-node-title.cell').text(); // get text
cart = cart.match(/.{1,5}/g); // split into 5 char long pieces
cart = cart.join(",",); join on comma

How to make jQuery objects from an array?

anArray = ['thing1','thing2','thing3'];
$.each(anArray, function (i,el) {
var object = 'name.space.' + el;
var selector = 'node-' + el;
var object = $('#' + selector);//need object here to be interpreted as it's value
//as if: var name.space.thing1 = $('#' + selector);
});
such that these are usable jQuery objects:
console.log(name.space.thing1);
console.log(name.space.thing2);
console.log(name.space.thing3);
I feel like eval() is involved. I'm hydrating navigation selectors so as pages are added/removed, we just update the array. We could build the array from the nav nodes, but either way, we still need to be able to make these namespaced selectors...

You will have to use bracket notation:
var array = ['thing1', 'thing2'];
var object = {};
object.space = {};
$.each(array, function () {
object.space[this] = $('#node-' + this);
});
console.log(object.space.thing1); // [<div id="node-1">];

I am not sure what are you trying to accomplish, but
name.space[el] = $('#' + selector);
might work.
Object properties are always accessible with the bracket notation as well. This means that obj.xy is just the same as obj['xy'], but the latter is more flexible and can be used in situations like yours.

var anArray = ['thing1','thing2','thing3'];
var name = {space:new Array()};
$.each(anArray, function (i,el) {
var selector = 'node-' + el;
name.space[el] = $('#' + selector);
});

How to use contents of array as variables without using eval()?

I have a list of variables or variable names stored in an array. I want to use them in a loop, but I don't want to have to use eval(). How do I do this? If I store the values in an array with quotes, I have to use eval() on the right side of any equation to render the value. If I store just the variable name, I thought I'd be storing the actual variable, but it's not working right.
$(data.xml).find('Question').each(function(){
var answer_1 = $(this).find("Answers_1").text();
var answer_2 = $(this).find("Answers_2").text();
var answer_3 = $(this).find("Answers_3").text();
var answer_4 = $(this).find("Answers_4").text();
var theID = $(this).find("ID").text();
var theBody = $(this).find("Body").text();
var answerArray = new Array();
answerArray = [answer_1,answer_2,answer_3,answer_4,theID,theBody]
for(x=0;x<=5;x++) {
testme = answerArray[x];
alert("looking for = " + answerArray[x] + ", which is " + testme)
}
});

You can put the values themselves in an array:
var answers = [
$(this).find("Answers_1").text(),
$(this).find("Answers_2").text(),
$(this).find("Answers_3").text(),
$(this).find("Answers_4").text()
];
for(x=0;x<=5;x++) {
alert("looking for = " + x + ", which is " + answers[x])
}
EDIT: Or even
var answers = $(this)
.find("Answers_1, Answers_2, Answers_3, Answers_4")
.map(function() { return $(this).text(); })
.get();
If your answers share a common class, you can change the selector to $(this).find('.AnswerClass').
If you need variable names, you can use an associate array:
var thing = {
a: "Hello",
b: "World"
};
var name = 'a';
alert(thing[name]);

This would make it easier to get the array populated.
var answers = new Array();
$("Answers_1, Answers_2, Answers_3, Answers_4", this).text(function(index, currentText) {
answers[index] = currentText;
});

As others have mentioned, if you can put the variables in an array or an object, you will be able to access them more cleanly.
You can, however, access the variables through the window object:
var one = 1;
var two = 2;
var three = 3;
var varName = "one";
alert(window[varName]); // -> equivalent to: alert(one);
Of course, you can assign the varName variable any way like, including while looping through an array.

Jquery: Matching indexes of two arrays, string and object to replace text in object?

I have two arrays, one is full of strings, the other is an array of objects. The indexes on each correspond, and I want to replace the text of each of the objects in my object array with the corresponding text in my string array.
For example, I have an array like this:
var textarr = ["value1", "value2", "value3"]
and a Jquery object array that contains a bunch of span elements:
var spans = $("span.myClass");
var spanarr = $.makeArray(spans);
I'm trying to use $.each() to iterate over each of the spans and use the corresponding index of my text array to assign a text value to the current span.
I've tried a couple different ways, and nothing seems to work. I'm missing some logic here, but why wouldn't this work?:
i = 0;
jQuery.each(spanarr, function() {
$(this).text(textarr[i]);
i++;
});
EDIT:
I think maybe the rest of my function might be causing this not to work. Here's the entire script:
$("span input:radio").click(function() {
if (($(this).is(":checked")) == true) {
var parent = $(this).parent();
var aunts = parent.parent().children();
var parentIndex = aunts.index(parent);
var indexToNthChild = parentIndex + 1;
var otherSpans = $(".DropDownMenu span:nth-child(" + indexToNthChild + ")");
var position = parent.position();
var topValue = position.top;
var smallPrice = otherSpans.children("span.dropDownPrice");
var pricearr = jQuery.makeArray(smallPrice);
var textarr = [];
jQuery.each(pricearr, function() {
textarr[i] = $(this).text();
});
alert(textarr); // Returns all the text values expected in array
var changers = $(".bigPriceChanger");
var changerarr = $.makeArray(changers);
$(".DropDownMenu").css({ "top": "-" + topValue + "px" });
$(".DropDownMenu span").css("background-image", "none");
parent.css({ "background": "#f3f1e7 url(assets/images/branding/DropDownArrow.gif) no-repeat right" });
otherSpans.css({ "background": "#f3f1e7 url(assets/images/branding/DropDownArrow.gif) no-repeat right" });
alert(changearr); // Returns all span objects in array
i = 0;
jQuery.each(changearr, function() {
$(this).text(textarr[i]);
i++;
});
}
});

Try
$("span.myClass").each(function (i) {
$(this).text(textarr[i]);
});

I think you don't need the call to makeArray. Just write:
i = 0;
jQuery.each($("span.myClass"), function() {
$(this).text(textarr[i++]);
});

I hate to end the question with a 'it was all a dream afterall' copout, but it turns out my browser was funked.
I've since checked my script (and the million variations of it that everyone suggested) in IE8 and someone else's firefox, and low and behold, it works.

You might want to try something like this:
var spans = $("span.myClass");
for(i=0;i<spans.length;i++){
spans[i].innerHTML = textarr[i];
}
You can think of a jQuery object like an extended version of an array. You can use length and [i] in reference to the number of DOM elements selected and the DOM element at a certain index respectively.

Your code is fine, although the makeArray call is redundant
There must be an error somewhere else,
here is your code running fine in firefox
http://jsbin.com/oxiwu
to edit go to http://jsbin.com/oxiwu/edit

I think your code is not working because the variable i was defined outside its scope.
Probably there is a better solution, but you could try the following:
function createF() {
var i = 0;
function f() {
$(this).text(textarr[i]);
i++;
}
return f;
}
f = createF();
jQuery.each(spanarr, f);

What's the reason for calling $.makeArray? You can iterate through your spans like this...
$("span.myClass").each(function(i) {
alert(textarr[i]);
$(this).text(textarr[i]);
});