In C/S and B/S, how does one verify the value entered by the user on the keyboard?

 

In C/S

In the WinForm program, if you want to allow a text box to only enter numbers or letters, you can only enter the following methods ('\ B means: Delete the key ungemb '):

 

Only letters can be entered

Private void textBox2_KeyPress (object sender, KeyPressEventArgs e)

{

// Whether to process the event. If it is true, the event will be processed; otherwise, the event will not be processed.

E. Handled = true;

If (e. keyChar> = 'A' | e. keyChar> = 'A') & (e. keyChar <= 'Z' | e. keyChar <= 'Z') | e. keyChar = '\ B ')

{

E. Handled = false;

}

}

Only numbers can be entered

Private void textBox1_KeyPress (object sender, KeyPressEventArgs e)

{

E. Handled = true;

If (e. KeyChar> = '0' & e. KeyChar <= '9' | e. KeyChar = '\ B ')

{

E. Handled = false;

}

 

}

 

 

Method for rewriting in WINFORM: ProcessCmdKey can obtain keyboard keys

Protected override bool ProcessCmdKey (ref Message msg, Keys keyData)

{

Const int WM_KEYDOWN = 0X100;

Const int WM_SYSKEYDOWN = 0X104;

String strInfo = string. Empty;

 

If (msg. Msg = WM_KEYDOWN) | (msg. Msg = WM_SYSKEYDOWN ))

{

Switch (keyData)

{

Case Keys. Down:

StrInfo = "down ";

Break;

Case Keys. Up:

StrInfo = "up ";

Break;

Case Keys. Left:

StrInfo = "Left ";

Break;

Case Keys. Right:

StrInfo = "right ";

Break;

}

}

Return base. ProcessCmdKey (ref msg, keyData );

}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In B/S

In. aspx, you can only enter numbers as follows:

1. Verify using the JS method

2. Use Keyboard Events (also JS)

<Input onkeypress = "if (event. keyCode> = 48 & event. keyCode <= 57) {event. returnValue = true;} else {event. returnValue = false;} "/>

 

 

In. aspx, you can only enter letters as follows:

1. Verify using the JS method

2. Use Keyboard Events (uppercase letters: 65-90, lowercase letters: 97-122)

<Input onkeypress = "if (event. keyCode> = 65 & event. keyCode <= 90) | (event. keyCode> = 97 & event. keyCode <= 122) {event. returnValue = true;} else {event. keyCode = false;} "/>

 

 

Input Method of the shielded text box: style = "ime-mode: disabled"

 

 

How to remove the dotted line on the button when the button is pressed: hidefocus = "false"

 

 

From happy pig's column