how to check the checkbox on textbox on keypress event using javascript

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ASP.NET

checkbox

TextBoxBase

, +

in my web form one checkbox and one textbox

this is my code

C#

protected void txtpwd_TextChanged(object sender, EventArgs e)
       {
           if (txtpwd.Text == "123")
           {
               chckbox.Checked = true;
           }
           else
           {
               chckbox.Checked = false;
           }
       }

it's working but
i wanna show result like when ever i typing the password it will be changed

but it's working
when ever i leave the texbox it will checked

can u please tell me

thankxxx

Posted 2-Apr-15 0:54am

Parazival

Updated 2-Apr-15 1:18am

v3

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Parazival 2-Apr-15 7:27am

Please give me a correct solution

3 solutions

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OriginalGriff · Answer 1 · 2015-04-02T01:11:00

If you want to do that while the user is typing, you can't do it in C# - as MSDN says:
"The TextChanged event is raised when the content of the text box changes between posts to the server." https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.textchanged(v=vs.110).aspx[^]

That doesn't mean it happens on each character press by the user!
If you want this to work as the user types, you need to do it in JavaScript: http://www.w3schools.com/jsref/event_onchange.asp[^]

Abhinav S · Answer 2 · 2015-04-02T01:13:00

You will need a method that will check the validity of the password.
For e.g. in code below IsValidPasxword() will check if password is valid.

C#

protected void txtpwd_TextChanged(object sender, EventArgs e)
{
    if (txtpwd.Text == IsValidPasxword())
    {
        chckbox.Checked = true;
    }
    else
    {
        chckbox.Checked = false;
    }
}
private bool IsValidPasxword()
{
     //Check conditions for strong password
}

Peter Leow · Answer 3 · 2015-04-02T01:17:00

Solution 3

You want to detect every keystroke that a use enters, better use a JavaScript function which will only occur on the browser, without having to make a round trip to the server. Check this out: http://www.w3schools.com/jsref/event_onkeyup.asp[^]

Posted 2-Apr-15 1:17am

Peter Leow

how to check the checkbox on textbox on keypress event using javascript

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