Calling a javascript function with a parameter in a "ascx" control

Posted on 2007-11-26
Last Modified: 2012-08-14

I am writing a 'ASCX' control that contains a text input and 2 images.
I am successfully calling javascript functions from the images, with the textbox's clientID
(onclick="javascript:increment('<%= txtUpDown.ClientID %>')")

But I do not know how to call a javascript function from the input, with the input's id.
I tried: onclick="javascript:clearText('<%= txtUpDown.ClientID %>')

But it doesn't work.

How can I do that?

ascx code
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="updown.ascx.cs" Inherits="updown" %>
<table cellpadding="0" cellspacing="0" border="0" style="position:relative;top:11px;">
            <input type="text" id="txtUpDown" runat="server" onclick="javascript:clearText('<%= txtUpDown.ClientID %>')" size="1" maxlength="2" />
            <table border="0" cellpadding="0" cellspacing="2" style="position:relative;left:24px;top:-26px;">
                <tr height="3px">
                        <img src="../images/arrUp.gif" onclick="javascript:increment('<%= txtUpDown.ClientID %>', <%=MaxVal%>)"/>
                <tr height="3px">
                        <img src="../images/arrDown.gif" onclick="javascript:decrement('<%= txtUpDown.ClientID %>', <%=MinVal%>)"/>

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Question by:Relegence
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LVL 17

Expert Comment

ID: 20349524
remove "javascript:"
LVL 17

Expert Comment

ID: 20349533
but are you doing some event on the textbox. Or when do you want to call this function?
LVL 17

Expert Comment

ID: 20349543
and what is clearText doing?
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LVL 17

Accepted Solution

gops1 earned 400 total points
ID: 20349549
you can pass the id by any of the mouse or keboard event:

<input onclick="clearText(">

but instead you can pass the object itself by just saying "this"
<input onclick="clearText(this)">

Not sure what you want to do.

Author Closing Comment

ID: 31410964
I used <input onclick="clearText(">

Author Comment

ID: 20349601
Thank you very much.
What I was trying to do was clearing the text in the textbox. Since there are some textboxes, used with some ascx controls, I didn't know how to refer to the textbox I need.

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