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adding two values and dispaly into 3rd textbox [Resolved]

Posted by Ankitsrist under JavaScript on 1/23/2013 | Points: 10 | Views : 39003 | Status : [Member] | Replies : 11
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hello,
i have little proble
it's about adding two values from 2 textboxes and displays its value in 3rd textbox without clicking on any button or postbacks
I mean that once the user entered two numbers in two different text boxes, the summation should be added in the third one
my code is as follows

<script language ="javascript" type ="text/javascript" >
function adding()
{
var _txt1=document.getElementById ('<%=TextBox1.ClientID%>');

var _txt2=document.getElementById ('<%=TextBox2.ClientID%>');

var _txt3=document.getElementById ('<%=TextBox3.ClientID%>');

var t1=0, t2=0;

if(_txt1.value!="")

t1=_txt1.value;

if(_txt1.value!="")

t2=_txt2.value;

_txt3.value=parseInt(tl)+parseInt(t2);
}
</script>
    enter first no. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
    &nbsp; &nbsp; &nbsp;&nbsp;
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
    <br />
    enter second no. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
    &nbsp; &nbsp;
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br />
    <br />
    result &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
    &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;
    <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;
</asp:Content>


i know javascript function is not getting call bt when i write onkeyup="adding();" it gives an error that onkeyup is not valid....
help me



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Posted by: Shubham on: 1/23/2013 [Member] Starter | Points: 50

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hello!!! kindly copy and paste this html code
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>


<script TYPE="text/javascript">
function modifyText3()
{
var a = document.getElementById("text1").value;
var b = document.getElementById("text2").value;

var c = parseInt(a)+ parseInt(b);
document.getElementById("text3").value = c;
//document.write("parseInt(a)+b = "+c);
}
</script>




</head>
<body>
<form id="form1" runat="server">
<div>
first number<input id="text1" onchange="modifyText3()" />
Second Number<input id="text2" onchange="modifyText3()" />
result<input id="text3" />

</div>
</form>
</body>
</html>



Thanks&Regards:-
Shubham Choudhary
Software Engineer
www.facebook.com/shubham.kunar

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Posted by: Shubham on: 1/23/2013 [Member] Starter | Points: 25

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Hi!!!Ankitsrist


Place an "onchange event" on both your text boxes like so

<input id="text1" onchange="modifyText3" />
<input id="text2" onchange="modifyText3" />
<input id="text3" />
Then your javascript would be

function modifyText3()
{
var val1 = document.getElementById("text1").value;
var val2 = document.getElementById("text2").value;
document.getElementById("text3").value = val1 + val2 + ;
}

Thanks&Regards:-
Shubham Choudhary
Software Engineer
www.facebook.com/shubham.kunar

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Posted by: Ankitsrist on: 1/23/2013 [Member] Starter | Points: 25

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sir it is again showing an error that onchange is not a valid attribute....wat is the problem with this it is not acceptng onkeypress, onkeyup and ur onchange....do i miss something

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Posted by: Ankitsrist on: 1/23/2013 [Member] Starter | Points: 25

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thanku sir finaly its done..

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Posted by: Ranjeet_8 on: 1/23/2013 [Member] [MVP] Gold | Points: 25

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Try this, 

    <script type="text/javascript" language="javascript">

        function Sum() {

            var value1 = document.getElementById('<%=TextBox1.ClientID%>').value;

            if (value1.length < 1)

                value1 = 0;

            var value2 = document.getElementById('<%=TextBox2.ClientID%>').value;

            if (value2.length < 1)

                value2 = 0;

            var value3 = parseInt(value1) + parseInt(value2);

            document.getElementById('<%=TextBox3.ClientID%>').value = value3;

            document.getElementById('<%=TextBox2.ClientID%>').focus();

            return false;

        }

    </script>

 

       <asp:TextBox ID="TextBox1" runat="server" MaxLength="10" onchange="return Sum();"

            Width="119px"></asp:TextBox>

        <asp:TextBox ID="TextBox2" runat="server" MaxLength="10" onchange="return Sum();"

            Width="119px"></asp:TextBox>

         <asp:TextBox ID="TextBox3" runat="server" MaxLength="10"

            Width="119px"></asp:TextBox>


Please Mark As Answer if this helps you

.

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Posted by: Ankitsrist on: 1/23/2013 [Member] Starter | Points: 25

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it was not working with when i have taken textbox id=textbox1............but when i took input id="text1" it work.....wat is the difference between this

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Posted by: Ankitsrist on: 1/23/2013 [Member] Starter | Points: 25

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hello Ranjeet_8 sir, i have tried but it is giving an error that "onchange" is not valid, but it is working with html "input" text control

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Posted by: Shubham on: 1/23/2013 [Member] Starter | Points: 25

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hi!!! Ankitsrist
i m not sure about this but it would be given error due to compatibility of browser and due to textbox runs on server
some time java script not compatible with server controls but some time not always.

Thanks&Regards:-
Shubham Choudhary
Software Engineer
www.facebook.com/shubham.kunar

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Posted by: Ankitsrist on: 1/23/2013 [Member] Starter | Points: 25

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ok sir thanks again

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Posted by: Ankitsrist on: 1/23/2013 [Member] Starter | Points: 25

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yeah may be textbox control not support onchange, onkeyup etc

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Posted by: Sgtammana on: 1/25/2013 [Member] Starter | Points: 25

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Hi,

Try the onblur instead of onchange. then it will work.


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