Resize textbox based on user input in ASP.net

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Hello guys,

I'm working on a project in which my textboxes will have to resize based on the user input, the width to be specific. I found this code but it's the height that resizes and i think that you have to make multiple functions for each textboxes since it uses document.getElementById. Is it possible to resize its width based on user input? Is there an alternative for this code to make it applicable to other textboxes? Thanks in advance.

1. Control declaration:

<asp:TextBox ID="txtMsg" runat="server"  TextMode="MultiLine" style="overflow:hidden" onkeyup="AutoExpand(this, event)" Rows="2" />

2. JavaScript function:

function AutoExpand(txtBox, event) 
{
    if (event.keyCode == "13" || event.keyCode == "8") 
{
        var therows = 0
        var thetext = document.getElementById(txtBox.id).value;
        var newtext = thetext.split("\n");
        therows += newtext.length

        document.getElementById(txtBox.id).rows = therows;
        return false;
    }
}

Posted 3-May-12 8:56am

Michael Sernal

Updated 3-May-12 9:26am

Not Active

v2

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[no name] 3-May-12 15:26pm

Format code snippets when posting

3 solutions

Solution 1

The rows property of course changes the height of the element. If you want to change the width then use this http://api.jquery.com/width/[^] or this http://api.jquery.com/css/[^]

You should learn to use JQuery.

Posted 3-May-12 9:30am

Not Active

Updated 3-May-12 9:31am

v2

Solution 2

Rows used to increase height of TextBox.

Could you use please try with 'Cols' atttribute/ property

Posted 3-May-12 10:31am

Member 8291736

Comments

Michael Sernal 4-May-12 9:51am

hi,
i tried to change the below code:
var newtext = thetext.split("\n");
document.getElementById(txtBox.id).rows = therows;

to this:
var newtext = thetext.split(" ");
and this:
document.getElementById(txtBox.id).columns = therows;

but nothing happens to the width or column when i press enter, and also i would like to change the event to spacebar but couldn't the keycode for spacebar, any ideas? thanks.

Michael Sernal 4-May-12 9:58am

got the keycode for spacebar 32, but couldn't find a way to make it work, would you mind showing me in code? thanks.

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Michael Sernal · Accepted Answer · 2012-05-04T11:37:00

hi guys,

I was able to solve the problem with a help of a friend. Here it goes.

XML

1. Control declaration:

<asp:TextBox ID="txtMsg" runat="server"  TextMode="MultiLine" style="overflow:hidden" onkeyup="AutoExpand(this)" Rows="2" />