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Linking button to jQuery through service

I have a small problem that should be very easy to overcome. For some reason I cant work this out. So the problem is I cannot get a button to link to some jquery. My set-up is as follows (showing the relevant code):
Default.aspx
jQuery:
function getContent() {
var data = {
numberID: 1
};
$.jsonAspNet("ContentService.asmx", "GetContent", data,
function (result) {
$('#content').html(result);
});
}
jQuery(document).ready(function () {
getContent();
});
HTML:
<div id="content"></div>
ContentService.vb
<WebMethod()> _
Public Function GetContent(number As Integer) As String
Dim sb = New StringBuilder
sb.AppendLine("<table>")
sb.AppendLine("<tr>")
sb.AppendLine("<td class='ui-widget-header ui-corner-all'>Number</td>")
sb.AppendLine("</tr>")
sb.AppendLine("<tr>")
sb.AppendLine("<td>" & number & "</td>")
sb.AppendLine("<td><a href='#' id='test' class='fg-button ui-state-default ui-corner-all'><img src='" & Context.Request.ApplicationPath & "/images/spacer.gif' class='ui-icon ui-icon-pencil' /></a></td>")
sb.AppendLine("</tr>")
sb.AppendLine("</table>")
Return sb.ToString
End Function
So that's the basics of what I have everything works but I'm not sure how to get the a button (id='test') to get linked to some jQuery. I want it to be pressed and bring up a popup.
I have tried to put the jQuery on default.aspx but this doesn't seem to work unless the button is place in the HTML on that page.
$('#test').unbind('click').click(function () {
alert('Working');
});
I'm sure this is easy to do, but I have been trying for a while and cannot seem to get it to work.

Is the problem that you're trying to bind to the element that ISN'T in existance yet?
are you calling the $('#test').unbind('click').click(function () {
alert('Working');
}); BEFORE the service has returned?
$('#test').on('click', function () {
alert('Working');
});
This will bind the event to the '#test' element once it has been inserted in to the DOM.

As you load the content via ajax, you have to bind to $('#content'). Like this:
$(function () {
$('#content').on('click', '#test', function () {
e.preventDefault(); // if a default action is not needed needed
alert('Working');
});
});

I guess this is about not preventing the default behaviour of the A href tag. Now it will probably link to '#' instead of firing the onclick event.
$('#test').on('click', function (e) {
alert('Working');
e.preventDefault();
});
You could try to wrap this in a document ready, or eventually use the .on binder from jQuery, since it's dynamic content.

Solved
It was a very small thing that caused this. The code to fix this problem is as follows:
$('#test').unbind('click').click(test);
This needed to go inside the function with the json so:
function getContent() {
var data = {
numberID: 1
};
$.jsonAspNet("ContentService.asmx", "GetContent", data,
function (result) {
$('#content').html(result);
$('#test').unbind('click').click(test);
});
}
Thank you to everyone that has tried to help me.

Simple Javascript Calling function not working/don't know how to get it to work

I'm trying to call a function and not the alert and I thought it was as easy as just doing something like this: FunctionsName(); and delete the alert(''); but it's not working for me :(
Can someone please look at the code I have below and tell me what is wrong ?
Thank you so much!!
<script type="text/javascript">
var comper;
function checkComper() {
var onResponse = function(comperNow) {
if (comper === undefined) {
comper = comperNow;
return;
}
if (comper !== comperNow) {
// show a message to the visitor
alert("New Info Added"); // <--*** I WANT TO TAKE THIS OUT AND CALL $("#append").click(function(e)
comper = comperNow;
}
};
$.get('getlastupdate.php', onResponse);
}
var tid = setInterval(checkComper, 2000);
$(function() {
var $table = $("table.tablesorter");
$("#append").click(function(e) {
e.preventDefault();
$.get('updatetable.php', function(data)
{
$table
.find('tbody')
.html('')
.append(data);
$table.trigger("update", [true]);
});
});
/*........ and so on.... */
</script>

What about changin that :
alert("New Info Added");
to that :
$('#append').trigger('click');
It will simulate a click and trigger the function.

One thing important to distinguish:
alert("New Info Added") is a function. Actually, alert() is a function, being passed the parameter "New Info Added".
$('#append').click(function(e) { is not a function, at least, not in the same way. $('#append') is a jQuery selector function, which selects all elements with an id of "append". $('#append').click() is a function that sets a click event on all elements returned in the selector.
What the whole syntax of $('#append').click(function(e) { means is on its own a syntax error. What you're doing is telling the elements found in the selector what their click function should be. But the function(e) { says that it's the start of the code of the function. That line of code isn't complete until the ending }) - the } closing the function declaration and the ) closing the call to click.
So, you can't simply replace alert("New Info Added"), which is a complete function call, with $('#append').click(function(e) {, because it's a syntax error - you haven't completed the function(e) declaration, nor the click function call. You can trigger the click function, as Karl's answer told you. Or, you can use the shortcut:
$('#append').click()
Note that this is a full proper sentence, and can therefore replace the alert.

Using jquery to see if selector pulled any divs, find a div thats specific to example page

I'm pretty new to jquery, this is what i need help with: Using jquery to see if a selector pulled any divs, find a div thats specific to example page. See if first condition is false and if so redirect to example page. Thanks for any help!
Jquery partial code: "
$('.assessment-start').click(function () {
$('#startAssessmentDialog').empty();
//block
$('#startAssessmentDialog').block(_blockUISettings);
//block
var link = $('#startAssessmentDialog').attr('link');
AjaxUtil.Services.PageProxy.SendData(link, GLOBAL._HTTPVerbs.GET, {},
function (data) {
var $data = $(data);
$('#startAssessmentDialog').html($data.find('#surveyContainer'));
$('div[name*="*"]').val('*');</script>
// hide the unmapped capability areas
$("#unmappedCapabilityAreas").hide();
// unblocking
$('#startAssessmentDialog').unblock();
// unblocking
},
function (exception) {
AjaxUtil.DefaultExceptionHandler(exception);
$('#startAssessmentDialog').unblock();
}
);
"
Html code:
<div link="/Survey/details/#Global.CGSs[Model.CGSVersionID.Value].SelfAssessmentSurveyResourceID/#Model.ResourceID" id="startAssessmentDialog" class="noDisplay">
</div>

Seeing if selector got any divs:
var selector_pulled_divs=($(selector).filter("div").length!=0)
We'd need some code to work with to help you further.

You can check with nodeName property:
if ($(".selector").get(0).nodeName == 'div') { \\do stuff }

I think you're trying to do something:
if( $('#selector').length ) {
// do something if selector pulled a div
} else {
// do something if selector not pulled a div
// for page redirect write following line
window.location = 'YOUR_URL';
}
$('#selector').length will check the exists of div with id=selector.

jQuery: Call a function twice

I'm trying to run a function twice. Once when the page loads, and then again on click. Not sure what I'm doing wrong. Here is my code:
$('div').each(function truncate() {
$(this).addClass('closed').children().slice(0,2).show().find('.truncate').show();
});
$('.truncate').click(function() {
if ($(this).parent().hasClass('closed')) {
$(this).parent().removeClass('closed').addClass('open').children().show();
}
else if ($(this).parent().hasClass('open')) {
$(this).parent().removeClass('open').addClass('closed');
$('div').truncate();
$(this).show();
}
});
The problem is on line 13 where I call the truncate(); function a second time. Any idea why it's not working?
Edit jsFiddle here: http://jsfiddle.net/g6PLu/

That's a named function literal.
The name is only visible within the scope of the function.
Therefore, truncate doesn't exist outside of the handler.
Instead, create a normal function and pass it to each():
function truncate() { ...}
$('div').each(truncate);

What's the error message do you get?
You should create function and then call it as per requirement
Define the function
function truncate(){
$('div').each(function(){
});
}
Then call the function
truncate();

Another approach is to establish, then trigger, a custom event :
$('div').on('truncate', function() {
$(this).......;
}).trigger('truncate');
Then, wherever else you need the same action, trigger the event again.
To truncate all divs :
$('div').trigger('truncate');
Similarly you can truncate just one particular div :
$('div#myDiv').trigger('truncate');
The only prerequisite is that the custom event handler has been attached, so ...
$('p').trigger('truncate');
would do nothing because a truncate handler has not been established for p elements.

I know there's already an accepted answer, but I think the best solution would be a plugin http://jsfiddle.net/g6PLu/13/ It seems to be in the spirit of what the OP wants (to be able to call $('div').truncate). And makes for much cleaner code
(function($) {
$.fn.truncate = function() {
this.addClass('closed').children(":not('.truncate')").hide().slice(0,2).show();
};
$.fn.untruncate = function() {
this.removeClass('closed').children().show();
};
})(jQuery);
$('div').truncate();
$('.truncate').click(function() {
var $parent = $(this).parent();
if ($parent.hasClass('closed')) {
$parent.untruncate();
} else {
$parent.truncate();
}
});

Javascript: addClassName if input is checked and removeClassName if it was un-checked

I'm trying to select all the li tags of the document and check if it hasClassName('yes') so if it has, it will remove it. But I'm having a TypeError: Object [object HTMLLIElement], has no method 'hasClassName' error.
This is the DOM method:
document.observe("dom:loaded", function() {
$(document.body).select('input').each(function(element) {
element.observe('click', function() {
init();
});
init();
});
});
The previous code will take the init function and check the if there are checked inputs and add them the 'yes' class name, but if I un-check those inputs, the class remains.
This is the function that I'm trying to do dynamic (add and remove class 'yes');
function init() {
$(document.body).select('input').each(function(element) {
if (element.checked) {
element.up('li').addClassName('yes');
}
if ($(document.body).select('li').hasClassName('yes')) {
element.removeClassName('yes');
}
})
}
Can you help me solving the last part of this function, so the removeclassname method will work? Thank you.

$(document.body).select('li') returns a collection, not an element, right? I would assume you want:
if (element.hasClassName('yes')) {
element.removeClassName('yes');
}
However, it seems that your logic is flawed -- you are first adding the class if the input is checked, then you are immediately removing it. Are you missing an else? Maybe something more like:
function init() {
$(document.body).select('input').each(function(element) {
if (element.checked) {
element.up('li').addClassName('yes');
}
else {
element.up('li').removeClassName('yes');
}
})
}

Wait a sec - that "select" is going to return an array of elements. The "hasClassName" function is a function on Element directly, not on Array or Enumerable. You're missing an "each()" layer.
$$('li').each(function(li) {
if (li.hasClassName('yes')) li.removeClassName('yes');
});