如何使用javascript检查keypress事件上的文本框上的复选框 [英] how to check the checkbox on textbox on keypress event using javascript

问题描述

在我的网页表单中有一个复选框和一个文本框



这是我的代码

in my web form one checkbox and one textbox

this is my code

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

它正在工作但是

i想要显示结果，就像我输入密码时一样，它会被更改





但它正在工作

当我离开texbox时它会检查



你可以告诉我



thankxxx

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

推荐答案

如果你想在用户输入时这样做，你就不能用C＃来做 - 正如MSDN所说：

当文本框的内容在发布到服务器的帖子之间发生变化时，会引发TextChanged事件。 https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.textchanged（v = VS .110）.aspx [ ^ ]



这并不意味着它会在用户每次按下字符时发生！

如果你想让它作为用户类型，您需要在JavaScript中执行： http://www.w3schools.com/jsref/event_onchange.asp [ ^ ]

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[^]

您将需要一种方法来检查密码的有效性。

例如在下面的代码中，IsValidPasxword（）将检查密码是否有效。

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.

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
}

您想要检测用户输入的每个击键，更好地使用只能在浏览器上进行的JavaScript功能，而无需前往服务器。看看这个： http://www.w3schools.com/jsref/event_onkeyup.asp [ ^ ]

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[^]

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