Summary of some restrictions on text boxes ~~

1. Chinese characters cannot be entered in the restricted text box:
In the past, we often used judgment to write data, for example:
Copy codeThe Code is as follows:
Function nocn (obj)
{
For (I = 0; I <document. getElementsByName ("Text1") [0]. value. length; I ++)
{
Var c = document. getElementsByName ("Text1") [0]. value. substr (I, 1 );
Var ts = escape (c );
If (ts. substring (0, 2) = "% u ")
{
Document. getElementsByName ("Text1") [0]. value = "";
Alert ("Chinese/fullwidth characters cannot be entered here ");
}
}
}


But few people use ime-mode: disabled (use css to disable text box input methods)
Ime-mode
Syntax:
Ime-mode: auto | active | inactive | disabled
Valid value:
Auto: default value. The IME status is not affected. Same as when the ime-mode attribute is not specified
Active: Specify all characters entered using IME. Activate the local language input method. You can still cancel IME activation.
Inactive: specifies all characters that do not use IME. Activate a non-local language. You can still cancel IME activation.
Disabled: Completely disable IME. For controls with focus (such as input boxes), you cannot activate IME.

So:
<Input onpaste = "return false;" type = "text" name = "textfield" style = "ime-mode: disabled" value = "">
Ime-mode: disabled indicates the disabled input method.
Extension:
Copy codeThe Code is as follows:
<Script language = "JavaScript">
<! --
Function change (oButton)
{
Var obj = document.all.txt;
If (obj. style. imeMode = "disabled ")
{
Obj. style. imeMode = "active ";
Obj. value = "";
OButton. value = "blocking Chinese Input Methods ";
}
Else
{
Obj. style. imeMode = "disabled ";
Obj. value = "";
OButton. value = "Activate Chinese Input Method ";
}
}
// -->
</SCRIPT>
<Input type = "text" NAME = "txt" style = "ime-mode: disabled" style = "ime-mode: disabled">
<Input type = "button" value = "Activate Chinese INPUT Method" onclick = "change (this)">

I think about it myself ~
2. The Restricted text box cannot be pasted:
We usually see this idea: Disable the Ctrl key and C key, and then disable the right-click function to disable the paste function perfectly.
So you need to write the JS file (this JS file has relevant content in this blog)
In fact, onpaste = "return false;" can be used perfectly to disable pasting. Note that the pasting function is disabled, so this attribute is used, even if you can't help but use the right-click function, you cannot paste the content.

So:
Copy codeThe Code is as follows:
<Input onpaste = "return false;" type = "text" name = "textfield" style = "ime-mode: disabled" value = "">

In onpaste, paste is disabled.