Properties of Textbox

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Hi Geeks,

Just a small doubt in textbox properties in asp.net

I just 4 textbox

a=4(Textbox)
b=2(Textbox)
c=2(Textbox)
d=4(Textbox) .... Just as an example..

I multiply b & c and put the result on d. When d(Textbox) has some value in textbox, I should check whether a and d are equal, if not will throw an error.

Can be done this in OnLoad function of a textbox ??

Posted 3-Jun-14 20:32pm

Sriram Ramachandran

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Bh@gyesh 4-Jun-14 2:42am

Why you need to calculate onLoad function. You can use textchange event of textboxes.

Sriram Ramachandran 4-Jun-14 2:49am

I doesn't know which property to use? Using OnTextChange, Only after typing the method gets invoked.

2 solutions

Solution 1

There is no OnLoad function for TextBox.
You can do like this
1) multiply B and C Textbox as

C#

TxtBox_D.Text =   Convert.ToInt32(TxtBox_B.Text) * Convert.ToInt32(TxtBox_C.Text) ;

and check the values as

C#

if( TxtBox_A.Text != TxtBox_D.Text )
{
throw new Exception("not matching"); 
}

Posted 3-Jun-14 20:46pm

Karthik_Mahalingam

Comments

Sriram Ramachandran 4-Jun-14 2:54am

as soon as the TextBox_D got value in its textbox, I need to throw a message. So I need to write only on TextBox_D method. Which method would be apt one?

Karthik_Mahalingam 4-Jun-14 3:00am

you need to perform the action in client side ( javascript) or server side ( asp, c#) ??

Sriram Ramachandran 4-Jun-14 3:08am

Yeah atlast, I am trying that...

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DamithSL · Accepted Answer · 2014-06-03T20:58:00

you can validate in client side using javascript or jQuery

HTML

<input type="text" id="a" value="0" />
<input type="text" id="b" value="0"/>
<input type="text" id="c"  önkeyup="calc()" value="0"/>
<input type="text" id="d" value="0"/>

JavaScript

function calc() {
    document.getElementById('d').value = parseInt(document.getElementById('c').value) * parseInt(document.getElementById('b').value);
    if (document.getElementById('a').value == document.getElementById('d').value) {
        alert("matching values");
    }
}

Demo[^]

if you need to do it with asp:TextBox

ASP.NET

<asp:TextBox ID="a" runat="server"  ClientIDMode="Static"></asp:TextBox> <asp:TextBox ID="b" runat="server"  ClientIDMode="Static"></asp:TextBox> 
<asp:TextBox ID="c" runat="server" onchange="javascript:calc();" ClientIDMode="Static">/asp:TextBox>
<asp:TextBox ID="d" runat="server"  ClientIDMode="Static"></asp:TextBox>