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asp button to call java script function

I am a new developer of asp.net, now I have a problem on the issue of how to call java script function in asp.net. (I am lack of java-script)
I have a java-script code that will show the confirm modal popup like this
$('#modals-bootbox-confirm').click(function()
{
bootbox.confirm("Are you sure?", function(result)
{
$.gritter.add({
title: 'Callback!',
text: "BootBox Confirm Callback with result: " + result
});
});
});
I have known that this script binds to item with id "modals-bootbox-confirm" like
<input type="button" id="modals-bootbox-confirm" name="Hello"/>
but in asp the button will be initial with type = "submit" it cannot call this because after click the button it will postback all the time so how to use this script in asp.net
I have tried to change the id in the script to the asp's id but it does not work. How do I get the result from this modal control? Please help.
I know that asp has onClientClick but how to apply this script to it?

its easy man,
Just do this
<asp:Button Id="aa" runat="server" onClientClick="function1();"/>
//and it Javascript turn it into function:
<script>
function1()
{
bootbox.confirm("Are you sure?", function(result)
{
$.gritter.add({
title: 'Callback!',
text: "BootBox Confirm Callback with result: "+ result
});
});
}
</script>

This is how to use OnClientClick:
<asp:Button OnClientClick="doSomething()" runat="server" />
Source: http://www.w3schools.com/aspnet/prop_webcontrol_button_onclientclick.asp

Very Short and Simple:
<asp:Button ID="Button1" runat="server" OnClientClick='return confirm("Are You Sure?")' />

ASP textbox calls javascript function

I have a search textbox in asp. And I want it to send request to the server each time the text is changed there. I have a javascript function which sends request but it is not being called each time when I type something in the text box. How can I call javascript function from ASP textbox?
That is my textbox:
<asp:TextBox ID="search" name="Search" runat="server" onchange="javascript:text_changed();"></asp:TextBox>
That is my js function:
function text_changed() {
searchedword = document.getElementById("ContentPlaceHolder1_search").value;
SendRequest();
}

You should use onKeyPress event to call the function.
<asp:TextBox ID="search" name="Search" runat="server" onKeyPress="javascript:text_changed();"></asp:TextBox>

Shivam's answer is right. You can use KeyPress event to get users key strokes with that event.
But i want to inform you, you should not use ASP.NET control ids like that :
document.getElementById("ContentPlaceHolder1_search").value;
Because you'll get errors if you put your textbox somewhere else in html hierarchy, ASP.NET regenerates it's id.
Try that one, instead :
function text_changed(textObj) {
searchedword = textObj.value;
SendRequest();
}
<asp:TextBox ID="search" name="Search" runat="server"
onKeyPress="javascript:text_changed(this);"></asp:TextBox>

The functionality you asking can achieve by
Use onkeyup or onkeydown instead.
This will then run the function when you type or click on the textbox. You can also then detect the keycode of the event, and prevent the function if you dont want it to run for certain keys.
Use the below code
$("#search").keydown(function(){
text_changed();
});
$("#search").keyup(function(){
text_changed();
});
Demo Here

give it a try :)
$("#search").change(function(){
//your ajax codes
});

<script>
function multy(val)
{
alert(val.value+"--"+val.id);
}
</script>
<input id="txtdemo" type="text" onchange="multy(this);"></br>
<input id="txtdemo" type="text" onchange="multy(this);">
</input>
Thanks... :)

C# Function then Javascript Function on event (ASP.NET)

I'm having a difficult time getting around AutoPostBack with ASP.NET components, and was hoping someone can help. I've looked through multiple queries but nothing is really helping.
I have a 'Submit' button on my page that when clicked should do 2 things:
1. Run a server-side C# function that updates a bunch of <asp:Labels in a div tag.
2. Run a javascript animation that moves stuff around and makes the <div tag visible.
My functions work just fine by themselves, however my issue is with autopostback. If I use an <asp:Button the postback refreshes and the javascript animation is undone along with it. If I use an <input type="button" tag I am unable to run both the C# and Javascript functions. I've tried the following:
<input type="button" runat="server" onclick="c#function" onclientclick="javascriptFunction(); return false;"
** runat="server" seems to just enable postback on that button
<asp:Button
** C# function uses Page.ClientScript.RegisterStartupScript to invoke javascript function, but postback defeats the animation.
I'm hoping to keep the javascript animations as they make the interface very clean and intuitive, so any help in keeping it is greatly appreciated. Any suggestions?

You may use ajax. You can pass values to the server page thru ajax and let the server page handles (insert a record in table / send an email to someone / whatever....) it for you and return a result to you. Till you get your result. you can show a "Processing..." Message to the user.
Here is a plugin to have the block effect.
http://jquery.malsup.com/block/
The below is a small example of how to do it in ajax (with jquery)
HTML
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<head>
<body>
<input type="button" id="btnGetProd" value="Get Products" />
<div id="divProducts"></div>
<script type="text/javascript">
$("#btnGetProd").click(function(){
$("#divProducts").html("Processing your request....</div>").fadeIn(100, function ()
{
$.ajax({
url: "myajaxserverpage.aspx?mode=getprodcusts&category=3",
success: function (data) {
$("#divProducts").html(data).fadeIn(100);
},
error: function (req, textStatus, error) {
alert("Some error occured");
}
})
});
});
</script>
</body>
</html>
and you should have a page called myajaxserverpage.aspx which returns the content (ex: A list of products) for the div called "divProducts"
What the above code does is , When the user click on the button, it shows the text "Processing your request..." in the div and then make an ajax call to the aspx page.Once it receives the response, it put that to the div and then do a fadeIn effect.

what you are experiencing is expected. the browser will execute the javascript and then send a request to the server. the server processes the request and send a response. the client will then render the response. At this point any UI changes you made are discarded because a new request was received.
To get around this you will need to incorporate ajax into your page.

alternative way to reach your needs
1.let button do only javascript function
2.let javascript function do the postback after u finish your animation
ajax is not requirement

c# how to enable button ontextchange without posting back

so i have a lightbox in which pops up an aspx page with textboxes and two buttons (submit - disabled and cancel - enabled). I wanted to enable my submit button ontextchange. it works fine when opened separately (not as a lightbox) but when i let it run normally with the lightbox function everytime ontextchange gets triggered the whole page refreshes disabling the lightbox.
<asp:TextBox ID="textBox1" runat="server" OnTextChanged="OnTextChanged_AttributesEdited" autopostback="true">
protected void OnTextChanged_AttributesEdited(object sender, EventArgs e)
{
btnSubmit.Enabled = true;
}
now if i take out the "autopostback=true" it then will not trigger the the ontextchanged. was wondering if is it better if javascript will be the way to go for enabling the button or is there a way where i can prevent the postback when ontextchanged is triggered?
thanks a lot!

I think this would be a prime use for some jQuery in your application. Without posting back to the server for enabling / disabling a button, this would look a lot smoother, load faster and keep your current page state intact. An example might be as follows:
<script type="text/javascript">
$(document).ready(function() {
$("#textBox1").change(function() {
$("#btnSubmit").removeAttr("disabled");
});
});
</script>
Just put the above script tag in your HTML, just before closing the body tag.
An even better solution, however, would be to assign a specific CSS class to all the textboxes that should inherit that behaviour. Assuming that you assign a CSS class called "someCssClass" to all those textboxes, your script would then look something like this:
<script type="text/javascript">
$(document).ready(function() {
$("input.someCssClass").change(function() {
$("#btnSubmit").removeAttr("disabled");
});
});
</script>

I'd use jQuery as mentioned by #FarligOpptrenden, but if you don't have it and just want plain javascript, this should work.
Input within your lightbox:
<input type="text" id="textbox" onKeyUp="enableSubmitButton()" />
<input type="button" id="submitButton" value="Submit" />
<input type="button" id="cancelButton" value="Cancel" />
Javascript:
<script type="text/javascript">
function enableSubmitButton()
{
document.getElementById('submitButton').disabled = false;
document.getElementById('cancelButton').disabled = true;
}
</script>
You could also do your enabling/disabling buttons on load in javascript:
<script type="text/javascript">
window.onload = function () {
document.getElementById('submitButton').disabled = true;
document.getElementById('cancelButton').disabled = false;
}
</script>

Click ASP.NET button from jQuery dialog button event

I have the following ASP.NET markup:
<div id="myForm" title="My Form" style="display: none">
<span>You can see me!</span>
<div style="display: none">
<asp:Button ID="btnSave" runat="server" Text="Button"
OnClick="btnSave_Click" />
</div>
</div>
<!-- called by an element click event elsewhere -->
<script type="text/javascript" language="javascript">
$("#myForm").dialog({
modal: true,
width: 500,
height: 200,
resizable: false,
buttons: {
"Cancel": function () {
$(this).dialog("close");
},
"Save": function () {
$(this).dialog("close");
// I want to call btnSave_Click (by DOM-clicking the button?)
}
}
});
$("#myForm").parent().appendTo("form:first");
</script>
I'm trying to get the jQuery.dialog generated buttons to perform the postback in place of the ASP.NET button. What should I do to make the button do a submit and call the btnSave_Click method?
EDIT
"Save": function () {
$(this).dialog("close");
document.getElementById("<%=btnSave.ClientID %>").click();
}
... works but is this the best solution?

$("#<%=btnSave.ClientID %>").click();

You can use the btnSave.ClientId property to emit to the javascript the ID of the control you are looking for, then you can do something like this. This is if you want the btnSave control to register as a postback control, triggering the "Click" event in the code behind.
var myControl = document.getElementById('theclientidgoeshere')
myControl.click();
That will do it!
If you want to do a simple postback you can do
this.document.form.submit();
but that will NOT register any events for the button.
Is This Best?
For .NET 3.5 and earlier it is the only "truly" safe ways to get the client ID. With jQuery you could do a partial id match on _btnSave, but I find that that is too risky for future modifications.
.NET 4.0 does introduce an option that might help.
.NET 4.0 ClientIDMode Property
In .NET 4.0 you have an optional ClientIDMode Property that will allow you to choose how the client id is created. You can use Predictable or Static options to allow you to hard-code the id of the button into your JavaScript.