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Pass asp.net controls as params to javascript function

I am trying to get a javascript function to work properly with my asp.net controls. I have two radio buttons and three textboxes.
When the first radio button is clicked I would like to disable the third textbox and when the second radio button is clicked I would like to disable the third text box. See the attachment for a screenshot.
I have tested that the function works by adding "OnClick" to the first radio button and setting AN ALERT WHICH IS WORKING.
However, I am not sure how to pass the controls in to the function to have access to them. Anyone know how to do this?
Screenshot
ASP.NET
<asp:RadioButton ID="RadioButton1" runat="server" Checked="True" GroupName="DateTimeQuery" OnClick="TimeRangeClickEvent()"/>
<asp:TextBox ID="startdatetext" Enabled="true" runat="server" MaxLength="10"></asp:TextBox>
<asp:TextBox ID="enddatetext" Enabled="true" runat="server" MaxLength="10"></asp:TextBox>
<asp:RadioButton ID="RadioButton2" runat="server" GroupName="DateTimeQuery" OnClick="TimeRangeClickEvent() />
<asp:TextBox ID="withinthepast" Enabled="true" runat="server" Text="1"></asp:TextBox>
Javascript
<script>
function TimeRangeClickEvent(How do I pass asp.net controls here)
{
alert('Working');
}
</script>

You should use ClientID control properties to get IDs of HTML elements and then work with them from Javascript. More info.
In Javascript:
var radio1 = document.getElementById('<%=RadioButton1.ClientID%>');
When you have all your HTML elements you just need to handle necessary change/clicked/selected events in javascript to make it work.

How to prevent PostBack without using JavaScript?

I have an asp button in default.aspx:
<asp:Button ID="Button1" runat="server" Text="Button" />
And there is a procedure in default.aspx.vb:
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Panel1.Controls.Add(New LiteralControl(Date.Now))
End Sub
And teacher asked me, how to make exactly same operation (when click on button, shows up a date) but without postback and without javascript code. I could make a java code there and use OnClientClick="return false" but it seems not right

Refer The Client Side of ASP.Net Pages
You can't do. The default behaviour of Button(input type=submit) is to submit/post the form to the url specified in the form's action attribute.
If you want to prevent default behaviour you need to write a javascript return false
<asp:Button ID="btn" OnClientClick="return false" runat="server" Text="Button" />
By Default asp.net post the form to the same page itself. We say this as PostBack. See the form tags action value from rendered html in browser , it will be the same page name
<input type =submit name ="btn" id="btn"
onclick="javascript:__doPostBack('btn','')"value ="Button">
The following built in javascript code does this
<script>
function __doPostBack(eventTarget, eventArgument) {
document.Form1.__EVENTTARGET.value = eventTarget;
document.Form1.__EVENTARGUMENT.value = eventArgument;
document.Form1.submit();
}
</script>
Your page will have the below fields added automatically, inorder to detect which event needs to be fired in server side. you can access simply in a request parameters like Request.Params["__EVENTTARGET"]
<input type =hidden name ="__EVENTTARGET" value ="">
<input type =hidden name ="__EVENTARGUMENT" value ="">

getting control ID inside repeater by Jquery

I have Entries I want to comment on them . So I created a Repeater with a TextBox and a
Button inside it . How can I get the id of the button and textbox for specific row by
Jquery ?
<ASP:REPEATER runat="server">
<ItemTemplate>
...
// Entries: bind data from DB
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" />
</ItemTemplate>
</ASP:REPEATER>
Thanks .

Your big problem is that your asp repeater control is going to generate ids like this ct100_repeater_txt1 which isn't going to help you get that comment associated with its corresponding db row
The common way I have found to accomplish this (which is a pretty standard way I believe) is to assign the elements id with the row id from the database, or if you have no control over the id, to create a custom attribute.
Pseudo code I have used looks something like this: (I'll try and make it language/platform agnostic so you can learn the concept, as opposed to only the language)
<repeater template>
<textbox id="txt1" dbid='<% eval database id>'/>
<button id="btn1" dbid='<% eval database id>'/>
</repeater template>
that should generate code that looks like:
<input type="textbox" value="" id="ct100_txt1" dbid="14" />
<input type="button value="submit" id="ct100_btn1" dbid="14" />
<input type="textbox" value="" id="ct100_txt2" dbid="12" />
<input type="button value="submit" id="ct100_btn2" dbid="12" />
<input type="textbox" value="" id="ct100_txt3" dbid="39" />
<input type="button value="submit" id="ct100_btn3" dbid="39" />
Then in whatever language you want you can read from that attribute:
Button.Click{
get attribute dbid of button clicked;
save text of textbox of same dbid to a database;
}
Many cheers! Hope that works for ya
EDIT
In response the the comment "where do id save the dbid?!" I'm assuming in a database :) How should you save it? There are lots of ways. Here's one you could try with jquery:
create a javascript function to save answers that takes a parameter. when you bind the dbid to the control, bind it into an onclick function and pass that id to the function. The function then gets the text where the dbid matches and saves the comment and id to a database.
<textbox dbid="14" />
<input onclick="doStuff(14)" />
<script>
function doStuff(var id){
var comment = $('textbox[dbid=id]').value();
ajax(your url and arguments);
};
</script>

Without more information this is the best I can offer you:
for html like this (which is how asp.net will render your button/textbox):
<div id="row1"><button type="button">Click Me!</button><input type="text" name="tb_info" /></div>
<div id="row2"><button type="button">Click Me again!</button><input type="text" name="tb_info" /></div>
You could select the button and textbox for specific row by using the following jQuery:
$("#row1 > button, #row1 > input")

How can i check a radio button by clicking on asp text field using javascript

Hi
While working on asp, i want if i click on my asp text field, a radio button should be checked, but i dont find any onClick event available for asp text field, and if i use onchange, it is from the server end, i want this situation without page refresh, just like we do in html fields using javascript, please help!!!

Try this one:
HTML:
<asp:TextBox ID="txtSelect" runat="server" Width="200px" Text="Click here"> </asp:TextBox>
<br />
<asp:RadioButton ID="radCheck" runat="server" />
JQUERY:
$("#txtSelect").click(function(){
$("#radCheck").attr("checked",true);
});

OnFocus is probably the event I would use.

You can use Ajax if you don't wanna refresh the page

Why does .NET render javascript for a button when there's a custom validator on the page?

I've got two questions - first of all, why does .net render a javascript onclick event for asp buttons when there's a custom validator on the same page, and secondly, how can I get rid of the javascript?
It works fine when javascript is turned off, so I don't know what the point of it is. Here's a mini example:
<form id="form1" runat="server">
<asp:Button ID="Button1" OnClick="Button1_Click" Text="test" runat="server" />
<asp:CustomValidator ID="CustomValidator1" runat="server"
OnServerValidate="Stuff_Validate" EnableClientScript="false">
</asp:CustomValidator>
</form>
This will generate the following html for the button:
<input type="submit" name="Button1" value="test" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("Button1", "", true, "", "", false, false))" id="Button1" />
Without the custom validator, it's:
<input type="submit" name="Button1" value="test" id="Button1" />
Any ideas?
Thanks,
Annelie

If you look at what System.Web.UI.WebControls.Button does you can see why:
In GetPostBackOptions(), if you have any validators on the page (in the current validation group), then it will generate a script for the postback.
Then in AddAttributesToRender(), if any scripts are present, they are rendered out in the onclick event.
If you need to get around this, then you are going to have to build a custom Button

The javascript is added because the custom validation is done via javascript. It is meant to be there. How do you think the validation is done? If you got rid of the javascript the validation would not work.