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Using a variable inside a input check in JS

The input named alternativa-*** will have the *** changed in the PHP that comes before. I'm not using a form on PHP only a onClick statement calling the respondeQuestao function. But this code seems to not work. Someone have any suggestion.
$(document).ready(function() {
function respondeQuestao(qid,resposta) {
var alternativa = document.getElementsByName('input[name = "aternativa-"' + qid ']:checked').value;
document.getElementById("demo").innerHTML = 5 + 6;
if(alternativa==resposta) {
$("#botao-questao"+qid).hide();
};
if(alternativa!=resposta) {
};
};
})

Defining a function within the jQuery Ready statement limits the accessibility - define it outside of the jQuery Ready statement but call it when you need it.
function respondeQuestao(qid, resposta) {
var alternativa = $("INPUT[name^='alternativa-']:checked").val();
$("#demo").html(5+6);
if (alternativa == resposta) {
$("#botao-questro" + qid).hide()
} else {
//
}
}
Call the function inside jQuery:
$(function() {
respondeQuestao("id", 11);
});
I hope this helps.

Javascript - On('Click') - Error - Calling On Page Load

<script>
function playController(dataObj){
alert(dataObj);
}
function playHandlers(){
var dataObj = "stef";
$('.audiocontrol').on('click', playController(dataObj));
}
$(document).ready(playHandlers);
</script>
This bit of code is firing off on page load whether I click the object or not. Why?

What you want is:
function playController(dataObj){
alert(dataObj);
}
function playHandlers(){
var dataObj = "stef";
$('.audiocontrol').on('click', function() { playController(dataObj); } );
}
$(document).ready(playHandlers);
The way your code was written, it was calling playController when you were registering it in the .on call.
jsfiddle

You're invoking the function therefore passing the result of playController. You can do something like this.
function playHandlers(){
var dataObj = "stef";
$('.audiocontrol').on('click', function() {
playController(dataObj);
});
}

This will work:
(demo here)
function playController(dataObj) {
alert(dataObj);
}
function playHandlers() {
var dataObj = "stef";
$('.audiocontrol').on('click', function () {
playController(dataObj)
});
}
$(document).ready(playHandlers);
This will load your code when the page loaded and call the function playHandlers(). You were calling it directly because you forgot to add function(){} in the on/click call.

Calling Javascript Functions by name

If I have an element on the page like this ...
<span data-function="DoSomething">Click</span>
... and i put this in my page header ...
$(document).ready(function()
{
$('[data-function]').each(function()
{
var fName = $(this).attr('data-function');
$(this).click(fName);
});
});
... what goes in place of the comment produce the desired effect of executing the function called "DoSomething".
Note:
I no the code above wont work, my question is how to make this work (translate 'DoSomething' in to DoSomething();)
Any ideas guys?

The functions should be available. Try putting them in an Object, like this:
$(document).ready(function()
{
var fns = {
DoSomething: function() {/* ... */},
DoAnotherthing: function() {/* ... */}
};
$('[data-function]').each(function()
{
var fName = $(this).attr('data-function');
$(this).click(fns[fName]);
});
});
Here's a jsfiddle, demonstrating a way to keep everything local to one namespace and assigning handlers based on the data attribute of elements.

Try calling function with window object -
$(document).ready(function() {
$('[data-function]').each(function() {
var fName = $(this).attr('data-function');
if (typeof (window[fName]) === "function") {
$(this).click(window[fName]);
}
});
}

You can use something like
$(this).click(window[fName]);
Where window would be replaced by the appropriate expression if the function DoSomething is not defined in the global scope.

Maybe a little bit clean way:
http://jsfiddle.net/whsPG/
var myfuncs = {
alert : function() {
alert("An Alert");
},
changeName: function(obj) {
$(obj).text('Other Text');
}
};
$('[data-function]').on('click', function()
{
value = $(this).data('function');
if (myfuncs.hasOwnProperty(value)) {
myfuncs[value](this);
}
});
​

Converting javascript functions to jQuery

I have some javascript which I want to convert to jQuery...
I thought it would be easy, but it would appear I was wrong!
The code should resize a textarea depending on the amount of text entered into it.
Here's my code:
function haut() {
if ($(this).scrollTop() > 0) aug();
}
function aug() {
var h = parseInt($(this).height());
$(this).height(h + 10);
haut();
}
function top() {
$(this).scrollTop(100000);
haut();
}
$(document).ready( function() {
$("#txt_test").keyup(function() {
haut();
});
$("#txt_test").focus(function() {
top();
});
});
And here's the original code:
function haut(idt) {
if (document.getElementById(idt).scrollTop > 0) aug(idt);
}
function aug(idt) {
var h = parseInt(document.getElementById(idt).style.height);
document.getElementById(idt).style.height = h + 10 +"px";
haut(idt);
}
function top(idt) {
document.getElementById(idt).scrollTop = 100000;
haut(idt);
}
$(document).ready( function() {
$("#txt_test").keyup(function() {
haut(this.id);
});
$("#txt_test").focus(function() {
top(this.id);
});
});
Here's a jsfiddle if it helps... http://jsfiddle.net/HhRUH/

Please describe your problems specifically when you're asking a question.
So far I see you have the wrong code for binding handlers. It should be:
$(document).ready( function() {
$("#txt_test").keyup(haut);
$("#txt_test").focus(top);
});

The reason you can use $(this) in keyup(function() { ... }); is because of how it was called by the jQuery implementation. See javascript's .call and .apply for more information about setting context (this) manually.
In your code, you're not using haut.call(), but haut(), which will not set the this context. Therefore this means something different in haut when it's invoked like $('*').keyup(haut) than when it is invoked like $('*').keyup(function() { haut(); });. The same goes for your calling aug() from haut.

just send parameter to aug
function haut(idt) {
if ($(this).scrollTop() > 0) aug(idt);
}
http://jsfiddle.net/HhRUH/1/

You're using this wrong. Pass the element instead:
function haut(element) {
if (element.scrollTop() > 0) aug(element);
}
function aug(element) {
var h = parseInt(element.height());
element.height(h + 10);
haut(element);
}
function top(element) {
element.scrollTop(100000);
haut(element);
}
$(document).ready(function() {
$("#txt_test").keyup(function() {
haut($(this));
});
$("#txt_test").focus(function() {
top($(this));
});
});

You are losing scope. You can use:
1) dmitry's answer(and I think the best one)
$("#txt_test").keyup(haut);
$("#txt_test").focus(top);
2) or if you want to do some more things in the callback, you can do it
with using call():
$("#txt_test").keyup(function()
{
haut.call(this);
alert('...');
});
$("#txt_test").focus(function()
{
top.call(this);
});

Is it possible to bind to the Click event and not use an anonymous function -- I just want to call a named function

I have the following code. The first attempt at binding to click event does not work. The second way does. The first shows the alert "CheckBox1" during Page_Load. The second one shows the alert "CheckBox4" during the proper time -- during clicks.
$(document).ready(function () {
$(document.getElementById(checkBox1ID)).click( SetCheckBox1State(this.checked) );
$(document.getElementById(checkBox4ID)).click(function () { SetCheckBox4State(this.checked) });
});
function SetCheckBox1State(checked) {
alert("CheckBox2");
var radNumericTextBox1 = $find(radNumericTextBox1ID);
var wrapperElement = $get(radNumericTextBox1._wrapperElementID);
var label = $(wrapperElemenet.getElementsByTagName("label")[0]);
if (checked) {
radNumericTextBox1.enable();
label.addClass("LabelEnabled");
label.removeClass("LabelDisabled");
}
else {
radNumericTextBox1.disable();
label.addClass("LabelDisabled");
label.removeClass("LabelEnabled");
}
}
function SetCheckBox4State(checked) {
alert("CheckBox4");
var radNumericTextBox2 = $find(radNumericTextBox2ID);
var wrapperElement = $get(radNumericTextBox2._wrapperElementID);
var label = $(wrapperElemenet.getElementsByTagName("label")[0]);
if (checked) {
radNumericTextBox2.enable();
label.addClass("LabelEnabled");
label.removeClass("LabelDisabled");
}
else {
radNumericTextBox2.disable();
label.addClass("LabelDisabled");
label.removeClass("LabelEnabled");
}
}
Am I doing something improper? I'd rather not use an anonymous function...but maybe this just how things work?

This code:
.click( SetCheckBox1State(this.checked) );
Assigns the .click() function to be the output of this function: SetCheckBox1State(this.checked).
You will have to get rid of the argument (make it internal) and just pass the function name:
.click( SetCheckBox1State );