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Changing the color of a textbox text when we write a new one

I have this input text in my application
<asp:TextBox ID="note" runat="server" Text='<%#Eval("Note")%>' />
The default Foreground-color is Black .I'd like to change this property when i write in textbox, the letters will be in another color like Red.
So :
What is the easiest way to do this?
Did a property in the <asp:TextBox /> which can do this exists?

Easiest way to do this is with CSS. Add following class:
#note:focus {
color: red
}
When the textbox receives focus and ready to accept text - the color will be turned to red.
As an alternative, if for some reason you need to do this inline - you can, but this time with JavaScript. Modify your textbox like this:
<asp:TextBox ID="note" runat="server" Text='<%#Eval("Note")%>' onfocus="this.style.color='red'" onblur="this.style.color='black'" />
This will achieve the same results as above.
Demo: http://jsfiddle.net/S48tb/

runat="server" breaks my jQuery - datapicker

The runat="server" is breaking my jquery. I have two input, but for testing purpose added runat="server" in only one of those. Actually , I need to add on both.
Below you can find JS script to trigger the datetimepicker:
note: dateTo has runat="server" set and tried to change the way JS trying to get its ID, but still not working.
<script>
$(function(){
$("#dateFrom").datetimepicker();
$("#<%=dateTo%>").datetimepicker();
});
</script>
Here you can find the HTML input using runat="server" or not into asp.net code.
<tr>
<td>
<input type="text" id="dateFrom" name="dateFrom" value="" class="dateFrom" />
</td>
<td >
<input type="text" id="dateTo" name="dateTo" runat="server" value="" class="dateTo" />
</td>
</tr>
Does anybody has any idea,hint.....?
thank you

Use ClientID to get the generated Id of a server side control:
$("#<%=dateTo.ClientID%>").datetimepicker();
ASP.NET will generate a specific id attribute that is different from the id attribute of the server side control, so you need to use the generated value in order to access it from jQuery.

Since you're supplying class names, I suggest simply using those.
$(function(){
$(".dateTo, .dateFrom").datetimepicker();
});
Alternatively, you could give any "date" field on your form a class of "date" and use that:
$(function(){
$(".date").datetimepicker();
});
This is a common pattern for client-side validation, and also allows you to provide context clues through styling with CSS.

If you're using .NET 4 you can set the ClientIDMode attribute to Static. This will prevent the framework from changing the element's ID:
<input type="text" id="dateTo" name="dateTo" runat="server"
ClientIDMode="Static" class="dateTo" value="" />

ASP.NET will treat the inputs as server-side controls when runat=server is added, and this will result in transformed identifiers of those inputs so that they start with a container prefix (something like ctl00_), hence 'breaking' your jQuery selectors.
If you're using .NET 4 then you can disable these transformations by altering the ClientIDMode. Otherwise you will need to include the prefix in your selectors, or refactor your selectors to be independent of ID and somewhat distinct for selection by other means.

Use this to get correct client id for server controls
$('[id$=dateTo]').datetimepicker();

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")

Set the Value of a Hidden field using JQuery

I want to set the value of a hidden field, using JQuery.
Hidden Field:
<input id="chag_sort" type="hidden" name="chag_sort">
My JQuery:
$("#input[name=chag_sort]").val(sort2);
What am I doing wrong? I should also mention in console that sort2 does in fact have a value: DESC.

The selector should not be #input. That means a field with id="input" which is not your case. You want:
$('#chag_sort').val(sort2);
Or if your hidden input didn't have an unique id but only a name="chag_sort":
$('input[name="chag_sort"]').val(sort2);

Drop the hash - that's for identifying the id attribute.

If you have a hidden field like this
<asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("VertragNr") %>'/>
Now you can use your value like this
$(this).parent().find('input[type=hidden]').val()

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