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Dynamical search-function to show/hide divs

this is my first post on StackOverflow. I hope it doesn't go horribly wrong.
<input type="Text" id="filterTextBox" placeholder="Filter by name"/>
<script type="text/javascript" src="/resources/events.js"></script>
<script>
$("#filterTextBox").on("keyup", function () {
var search = this.value;
$(".kurssikurssi").show().filter(function () {
return $(".course", this).text().indexOf(search) < 0;
}).hide();
});
</script>
I have a javascript snippet like this on my school project, which can be found here: http://www.cc.puv.fi/~e1301192/projekti/tulos.html
So the search bar at the bottom is supposed to filter divs and display only those, that contain certain keyword. (t.ex, if you type Digital Electronics, it will display only Divs that contain text "Digital Electronics II" and "Digital Electronics". Right now, if I type random gibberish, it hides everything like it's supposed to, but when I type in the beginning of a course name, it will not hide the courses that dont contain the certain text-string.
Here is an example that I used (which works fine): http://jsfiddle.net/Da4mX/
Hard to explain, but I hope you realize if you try the search-function on my page. Also, I'm pretty new to javascript, and I get the part where you set the searchbox's string as var search, the rest I'm not so sure about.
Please help me break down the script, and possibly point where I'm going wrong, and how to overcome the problem.

in your case I think you show and hide the parent of courses so you can try
$("#filterTextBox").on("keyup", function () {
var search = $(this).val().trim().toLowerCase();
$(".course").show().filter(function () {
return $(this).text().toLowerCase().indexOf(search) < 0;
}).hide();
});

Try this this is working now, paste this code in console and check, by searching.
$("#filterTextBox").on("keyup", function () {
var search = this.value; if( search == '') { return }
$( ".course" ).each(function() {
a = this; if (a.innerText.search(search) > 0 ) {this.hidden = false} else {this.hidden = true}
}); })
Check and the search is now working.

Your problem is there :
return $(".course", this)
From jquery doc: http://api.jquery.com/jQuery/#jQuery-selection
Internally, selector context is implemented with the .find() method,
so $( "span", this ) is equivalent to $( this ).find( "span" )
filter function already check each elements
then, when you try to put $(".course") in context, it will fetch all again...
Valid code :
$("#filterTextBox").on('keyup', function()
{
var search = $(this).val().toLowerCase();
$(".course").show().filter(function()
{
return $(this).text().toLowerCase().indexOf(search) < 0;
}).hide();
});
In fact, you can alternatively use :contains() CSS selector,
but, it is not optimized for a large list and not crossbrowser
http://caniuse.com/#search=contains

You were accessing the wrong elements. This should be working:
$(".kurssikurssi").find('.course').show().filter(function () {
var $this = $(this)
if($this.text().indexOf(search) < 0){
$this.hide()
}
})

How to get just one value from array in javascript

i'm learning javascript and i've tried something but i can't figure out how to make it work, here's my code so far:
HTML
<p>Busca tu auto:</p>
<input type="text" id="search"><span> </span><button>Submit</button>
<p class="hide h1" style="color:green">Your car is available.</p>
<p class="hide h2" style="color:red">Your car is not available.</p>
JS
$(document).ready(function(){
var cars = ['mercedes','nissan','ferrari','bmw','fiat','toyota','renault','peugeot','kia'];
$('.hide').hide();
$('button').click(function(){
if($('#search').val() == cars[x]){
$('.h1').show();
$('.h2').hide();
} else {
$('.h2').show();
$('.h1').hide();
};
});
});
What I want to do is that when you click the button check if the car is available (it's not real). For example, it you type "mazda" and click the button, h2 will show, but if you type "ferrari" and click the button, h1 will show.
I'm approaching to the solution with my code above or not?
NOTE: if you change the "x" in cars[x] for a number it works, but just with one car.

Array.prototype.indexOf
$(document).ready(function(){
var cars = ['mercedes','nissan','ferrari','bmw','fiat','toyota','renault','peugeot','kia'];
$('.hide').hide();
$('button').click(function(){
if(cars.indexOf($('#search').val()) !== -1){
$('.h1').show();
$('.h2').hide();
} else {
$('.h2').show();
$('.h1').hide();
};
});
});
http://jsfiddle.net/CWHDv/

You can search through arrays by using the Array.indexOf method:
if (cars.indexOf($('#search').val()) !== -1) {
//your code here
}
The Array.indexOf method will return -1 when no exact matches are found (this includes lowercase/uppercase differences), and otherwise it will return the index of the match in the array. That means that if the entered value is in your array, it will return something other than -1, so the if-statement will return true.
To make this case-insensitive, use the following:
if (cars.indexOf($('#search').val().toLowerCase()) !== -1) {
//available
} else {
//unavailable
}
that converts the input to lowercase first, and checks afterwards. For this to work, all values stored in the array would need to be in all lowercase letters too, like your example shows.

Since this question is also tagged jQuery:
From the jQuery docs:
jQuery.inArray( value, array [, fromIndex ] )
Which would be:
$.inArray(('#search').val(), cars) !== -1
This also has the advantage of working in IE8 and below, something that Array.prototype.indexOf does not.

How to select textarea and check if it is readonly?

I am struggling with jQuery. I want to write a script which checks if the text area sharing the same parent (list item) with the button is read-only when that button is clicked. Here is the HTML:
...
<li>
<h1>Title</h1>
<button type="button" onclick="javascript:confirmDelete();">Delete</button>
<button type="button" onclick="javascript:toggle();">Toggle</button>
<textarea class="readOnly" readonly="true">Some text</textarea>
</li>
...
And the script:
<script language="JavaScript">
<!--
...
function toggle()
{
var textArea = $(this).parent("li").children("textarea");
var isReadOnly = textArea.attr("readonly");
if (isReadOnly == "true") {
alert('It\'s read-only.');
} else {
alert('It\'s not read-only.');
}
}
//-->
</script>
It appears that I cannot get passed the var textArea = ...
Update 1:
OK, I broke apart the selection in order to help myself analyze the problem:
...
var btn = $(this);
console.log(btn); //returns value, but not sure what exactly
var li = btn.parent();
console.log(li); //returns value, but not sure what exactly
var textArea = li.children('textarea');
console.log(textArea.prop('tagName')); //returns unidentified
So, there's the error. I can't seem to understand what is actually wrong, as I cannot really learn much if all the output I get from the debug is an object (and I don't even know what it represents; is it an element, or array ...) or unidentified. jQuery is not exactly intuitive.

The property is case sensitive. Try instead
var isReadOnly = textArea.attr("readOnly");

if it is the only you likely need:
...find("textarea")[0];
not
...children("textarea");
or simply $(this).siblings("textarea")[0];
OR select directly
var mylist = $(this).siblings("textarea.readOnly");
if (mylist.length > 0)//true if it is

There are some errors in here.
Firs of all, turns out that when the attribute "readonly" is active, it doesn't have a "true" value, but a "readonly" value.
On the other hand, if you invoque a function by onclick (and I'm not 100% sure), you cannot use $(this). I'd recommend you to do (after giving some ID to the trigger button, or anything to identify it):
$(function() {
$("button#my-button").bind("click", function() {
if ($(this).siblings("textarea").attr("readonly") == "readonly") {
alert("It's readonly");
} else {
alert ("It's not");
}
});
});

How can I show/hide divs dynamically (on KeyUp, iTunes style) using Javascript/jQuery and a text or search field with case insensitive

I set out on a journey to create an iTunes-like search using Javascript. I learned about jQuery, and with some help from people on StackOverflow, I was successful.
I've come back here to share with you a very simple way to create a dynamic hide/show list based on the user input.
Let's search!
The entirety of the tutorial code can be found here.
And a JSFiddle for it is here!

So good to see Nick was successful on this experiment. good job on learning how to do it :)
Just in case you haven't encountered this jquery plugin, you might want to take a look at it too it's called Quick search.
https://github.com/riklomas/quicksearch
And I've used it on numerous pages and it works like a charm. example:
http://fedmich.com/works/types-of-project.htm

First, create a simple Div Layout with some text in the divs and search bar above it.
<div class="search_bar">
<form><!--The Field from which to gather data-->
<input id="searchfield" type="text" onclick="value=''" value="Case Sensitive Search">
</form>
</div>
<!--Containers With Text-->
<div class="container">
<div class="container_of_hc">
<div class="horizontal_containers">Cat</div>
<div class="color">Black</div>
<div class="color">White</div>
<div class="color">Orange</div>
</div>
<div class="horizontal_containers">Dog</div>
<div class="horizontal_containers">Rat</div>
<div class="horizontal_containers">Zebra</div>
<div class="horizontal_containers">Wolf</div>
</div>
CSS:
.container {
width: 100%;
}
.horizontal_containers {
height:10%;
border: solid 3px #B30015;
font-size: 45px;
text-align: center;
}
Second, you will make a script utilizing jQuery. Remember the title says this is a Dynamic Search, meaning (for us) we want to update the search with each key typed:
$("#searchfield").keyup(function() {
Note: Need a selector refresher?
Then we will set a variable to the value in #searchfield:
var str = $("#searchfield").val(); //get current value of id=searchfield
To ensure we show all the divs in our list when there is nothing in the searchfield we create an if statement based on the length of our new variable (str):
if (str.length == 0) {
//if searchfield is empty, show all
$(".horizontal_containers").show();
}
Last, we do the actual hiding of the divs if the length of str is not 0:
else {
//if input contains matching string, show div
//if input does not contain matching string, hide div
$("div:contains('" + str + "').horizontal_containers").show();
$("div:not(:contains('" + str + "')).horizontal_containers").hide();
}
});
The div:contains() and div:not(:contains()) statements are what set the conditions. It's essentially an if statement. They search the text contained within the div, not the div attributes. If you want to search a deeper div structure you can use more than one selector in the script's jQuery statements like so:
if (str.length == 0) {
//if searchfield is empty, show all
$(".container .color").show();
} else {
//if input contains matching string, show div
//if input does not contain matching string, hide div
$(".container div:contains('" + str + "').color").show();
$(".container div:not(:contains('" + str + "')).color").hide();
}
Replace the script statement you already have to give it a try.
Note: The nesting structure of your divs must match that in your selector.
And that's essentially it. If you have tips to improve this, know how to change it to a case insensitive search, or anything else you can think of, please let me know!
Thanks to MrXenoType I have learned case insensitivity for the :contains function.
To create a case insensitive search for this project simply add:
$.expr[":"].contains = $.expr.createPseudo(function(arg) {
return function( elem ) {
return $(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
};
});
This creates a pseudo for the contains function. Place this code above your other script (within the same script) to make true for only this script.

Try:
$.expr[":"].contains_nocase = $.expr.createPseudo(function(arg) {
return function( elem ) {
return $(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
};
});
for adding a :contains_nocase() selector with jQuery 1.8

Show field if true, hide field if false?

Want to have a notification box displayed if amount in fieldA is higher than amount in fieldB.
Currently have some code working but the notification box toggles on and off not depending on the actual amount.
What am I missing?
jquery:
$(document).ready(function() {
$('#fieldA').change(function(){
if($(this).val()>$('#fieldb').val()){
//display it on the form
$('.labelNotification').toggle();
$('.labelNotification').append('Not recommended to have FieldA figure higher than FieldB.');
}
})
});
HTML:
< p style="display: none;" class="error labelNotification">

This is tailor-made for the toggle(boolean) method. Also, you have to be careful about appending to the notification label ... what if the user changes his answer twice? It's better to have multiple notification objects, each of which can contain stuff for a single type of notification.
$(function() {
$('#fieldA').change(function() {
var isLarger = +$(this).val() > +$('#fieldB').val(); // Note: convert to number with '+'
var $labelNotification = $('.labelNotification');
$labelNotification.toggle(isLarger);
if (isLarger) {
//display it on the form
$labelNotification.html('Not recommended to have FieldA figure higher than FieldB.');
}
})
});

If you're comparing numerical values (which it seems like you are), you should use parseInt or parseFloat to convert the (string) value returned by val() to an integer. According to the documentation for val, the function always returns a string value.

I found the problem ,
First thing is you need to have semicolon properly as below
$('#fieldA').change(function () {
if ($(this).val() > $('#fieldB').val()) {
alert("its greater");
//display it on the form
$('.labelNotification').append('Not recommended to have FieldA figure higher than FieldB.');
$('.labelNotification').show();
}
else {$('.labelNotification').hide();
$('.labelNotification').html('');}
});
Second thing , when you toggle it it won't show for the second time
if 40 > 30
and again if you entery 50 and 50 > 30 it won't show
this is second problem
final problem is empty the label all the time
$('.labelNotification').html('')'

Toggle is not the best approach for your situation.
You want to compare and then decide.
Since you are looking at numbers I would strongly suggest using a number type to do the comparison, either using parseInt() or parseFloat().
The text in the notification label only needs to be set once, since you don't have any comment for it showing something when B > A. I would suggest setting this in your HTML.
<span class="labelNotification" style="display:none">Your Warning Text</span>
<!-- if your CSS class has `display:none` remove the style attribute -->
as for the jQuery.
$(function() {
$("#fieldA").change(function() {
var a = parseInt($(this).val());
var b = parseInt($("#fieldb").val());
// handle if a or b is not a number --> isNaN(a) || isNaN(b)
if( a > b ) {
$('.labelNotification').show()
} else {
$('.labelNotification').hide()
}
});
});