How to update 2 textboxes with javascript?

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Friends,

How can I update a multiple textboxes value with javascript, when user change the value of textboxes,
and I have a value already on those textboxes ?

JavaScript

<input type="text" id="amount_textbox"  önChange="UpdateValue()" value="100">
    <input type="text" id="amount_textbox"  önChange="UpdateValue()" value="200">
    
      function UpdateValue()
      {
   	//alert ("you have changed the textbox...");
        var x = document.getElementById('amount_textbox').value;
        document.getElementById("amount_textbox").setAttribute("value", x);
        document.getElementById('amount_textbox').value = x;		
      }

That function is working only for the first textbox,the second one can not update,how can I make other textbox worked ?

Thanks

Posted 3-Jan-12 17:25pm

rider_1

Updated 8-Jan-12 20:13pm

Mehdi Gholam

v2

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3 solutions

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anushripatil · Answer 1 · 2012-01-03T17:32:00

Solution 1

You can try this,
Both the ids are same ,

HTML

<input type="text" id="amount_textbox"  önChange="UpdateValue()" value="100">
<input type="text" id="amount_textbox"  önChange="UpdateValue()" value="200">

so change the id as 'amount_textbox1'
and then also, onChange =UpdateValue(this) in both code

JavaScript

function UpdateValue(t)
{
//alert ("you have changed the textbox...");
        							var x = document.getElementById(t).value;
document.getElementById(t).setAttribute("value", x);
document.getElementById(t).value = x;
}
}

Posted 3-Jan-12 17:32pm

anushripatil

Updated 3-Jan-12 17:35pm

v2

Comments

rider_1 4-Jan-12 0:04am

Like this :
<input type="text" id="amount_textbox_0" önChange="UpdateValue(this)" value="100">
<input type="text" id="amount_textbox_1" önChange="UpdateValue1(this)" value="200">

function UpdateValue(t)

{
alert ("you have changed the textbox...");
var x = document.getElementById(t).value;
document.getElementById(t).setAttribute("value", x);
document.getElementById(t).value = x;

}

I tried at http://jsfiddle.net/N5RWn/1/

rider_1 4-Jan-12 0:06am

it's not working ??

rider_1 4-Jan-12 0:23am

error :
document.getElementById(t) is null

anushripatil 4-Jan-12 0:39am

check with t.id or you can use
document.getelementbyid("amount_textbox_0")....&
document.getelementbyid("amount_textbox_1")...

*Karthik Harve* · Answer 2 · 2012-01-03T17:34:00

Solution 2

try by changing the id of second textbox and pass one indicator to function.

HTML

<input type="text" id="amount_textbox1" önchange="UpdateValue(1)" value="100">
<input type="text" id="amount_textbox2" önchange="UpdateValue(2)" value="200"></input></input>

JavaScript

function UpdateValue(Ind)
{
        if (Ind==1)
{							
var x = document.getElementById('amount_textbox1').value;
document.getElementById("amount_textbox1").setAttribute("value", x);
document.getElementById('amount_textbox1').value = x;
}
else
{
var x = document.getElementById('amount_textbox2').value;
document.getElementById("amount_textbox2").setAttribute("value", x);
document.getElementById('amount_textbox2').value = x;

}
}

hope it works..

Posted 3-Jan-12 17:34pm

Karthik Harve

Updated 3-Jan-12 18:10pm

v2

Comments

rider_1 4-Jan-12 0:08am

it doesn't work...

Karthik Harve 4-Jan-12 0:10am

what is the problem or error..??

rider_1 4-Jan-12 0:24am

If I have multiple ( dynamic ) textbox ? do you have ideas ?

rider_1 4-Jan-12 0:16am

for( $i = 0; $i < count( $_POST['pay'] ); $i++)
{
echo '<input type="text" class="amount_text_change" id="amount_textbox" önChange="UpdateValue()" value="'.$amount_due.'">';
}

How can I do that ? so many ifs ??

rider_1 4-Jan-12 0:34am

is it possible to do it in a loop ?

Abhinav S 10-Jan-12 22:53pm

Good try. 5.

Vasim889 · Answer 3 · 2012-01-08T22:09:00

Solution 3

JavaScript

function get()
{
var text1=document .getElementById ("textbox1").value;
var text2=document .getElementById ("textbox2").value;
if(text1!="")

{
text2==text1;
return true
}
return false
}

Posted 8-Jan-12 22:09pm

Vasim889