JS shield function class (Shield F5, backspace key, Space key ......)

Last Update:2018-12-07 Source: Internet

Author: User

Tags domain name registration to domain

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1. shielding function

1.1 shield all keyboard keys
<Script language = "javascript">
<! --
Function document. onkeydown (){
Event. keyCode = 0;
Event. returnvalue = false;
}
-->
</Script>

1.2 Right-click the screen

Add oncontextmenu = self. event. returnvalue = false to the body tag.

Function nocontextmenu ()
{
If (document. all ){
Event. cancelBubble = true;
Event. returnvalue = false;
Return false;
}
}

1.3 Block Ctrl + N, Shift + F10, F5 refresh, and return keys

<Script language = "javascript">
<! --
// Shield right-click, Ctrl + N, Shift + F10, F5 refresh, and backspace key
Function window. onhelp () {return false} // block F1 help
Function KeyDown (){
If (window. event. altKey )&&
(Window. event. keyCode = 37) | // mask Alt + direction key seek
(Window. event. keyCode = 39) {// mask Alt + direction key →
Alert ("You are not allowed to use ALT + arrow keys to move forward or backward the webpage! ");
Event. returnvalue = false;
}

/* Note: this does not really block Alt + direction keys,
Because when the Alt + direction key pop-up warning box is displayed, press and hold the Alt key,
With the mouse clicked off the warning box, this blocking method will become invalid. If
Which of the following methods does the master really block the Alt key. */

If (event. keyCode = 8 )&&
(Event. srcElement. type! = "Text "&&
Event. srcElement. type! = "Textarea "&&
Event. srcElement. type! = "Password") | // block the backspace deletion key
(Event. keyCode = 116) | // block the F5 refresh key
(Event. ctrlKey & event. keyCode = 82) {// Ctrl + R
Event. keyCode = 0;
Event. returnvalue = false;
}
If (event. ctrlKey) & (event. keyCode = 78) // block Ctrl + n
Event. returnvalue = false;
If (event. shiftKey) & (event. keyCode = 121) // block shift + F10
Event. returnvalue = false;
If (window. event. srcElement. tagName = "A" & window. event. shiftKey)
Window. event. returnvalue = false; // block shift with the left mouse button to open a new page
If (window. event. altKey) & (window. event. keyCode = 115) {// block Alt + F4
Window. showModelessDialog ("about: blank", "", "dialogWidth: 1px; dialogheight: 1px ");
Return false ;}
}
/* In addition, you can use window. open to shield all IE menus.
Method 1:
Window. open ("Your .htm", "", "toolbar = no, location = no, directories = no, menubar = no, scrollbars = no, resizable = yes, status = no, top = 0, left = 0 ")
The second method is to open a full screen page:
Window. open ("Your. asp", "", "fullscreen = yes ")
*/
// -->
</Script>

1.4 shield the browser from the "minimize" "maximize" "Close" key in the upper right corner

<Script language = javascript>
Function window. onbeforeunload ()
{
If (event. clientX> document. body. clientWidth & event. clientY <0 | event. altKey)
{
Window. event. returnvalue = "";
}
}
</Script>

Or open the page in full screen mode.

Note: Add onbeforeunload = "javascript: return false" to the body tag to disable the window)

1.5 shield the F5 key

1.6 block IE back button

Use <a href = "javascript: location. replace (url)">

1.7 shield the scroll bar of the Main Window

Add style = "overflow-y: hidden" to the body tag"

1.8 shield the clipboard screen and clear the clipboard continuously

Add onload = "setInterval ('clipboarddata. setData (\ 'text \ ', \') ', 100)" to the body tag )"

1.9 shielding website Printing

Software Development Network www.mscto.com

<Style>
@ Media print {
* {Display: none}
}
</Style>

1.10 shield the Save icon automatically displayed on IE6.0 Images

Method 1:
<META HTTP-EQUIV = "imagetoolbar" CONTENT = "no">
Method 2:

1.11 shield all scripts on the page

Software Development Network www.mscto.com

<Noscrrept> </noscript> www.mscto.com

2. Form submission verification class

2.1 Form items cannot be blank

2.2 compare whether the values of the two form items are the same

2.3 form items can only be numbers and "_", used for phone/Bank Account Verification, and can be extended to domain name registration.

2.4 form entry input value/length limit

<Script language = "javascript">
<! --
Function CheckForm ()
{
If (document. form. count. value> 100 | document. form. count. value <1)
{
Alert ("the input value cannot be less than zero or greater than 100! ");
Document. form. count. focus ();
Return false;
}
If (document. form. MESSAGE. value. length <10)
{
Alert ("the input text is less than 10! ");
Document. form. MESSAGE. focus ();
Return false;
}
Return true;
}
// -->
</Script>

2.5 Chinese/English/numbers/email address legality judgment Software Development Network www.mscto.com

<Script language = "javascript">
<! --

Function isEnglish (name) // english value detection
{
If (name. length = 0)
Return false;
For (I = 0; I <name. length; I ++ ){
If (name. charCodeAt (I)> 128)
Return false;
}
Return true;
}

Software Development Network www.mscto.com

Function isChinese (name) // Chinese value detection
{
If (name. length = 0)
Return false;
For (I = 0; I <name. length; I ++ ){
If (name. charCodeAt (I)> 128)
Return true;
}
Return false;
}

Function isMail (name) // E-mail value detection
{
If (! IsEnglish (name ))
Return false;
I = name. indexOf ("@");
J = name. lastIndexOf ("@");
If (I =-1)
Return false;
If (I! = J)
Return false;
If (I = name. length)
Return false;
Return true;
}

Function isNumber (name) // value detection
{
If (name. length = 0)
Return false;
For (I = 0; I <name. length; I ++ ){
If (name. charAt (I) <"0" | name. charAt (I)> "9 ")
Return false;
}
Return true;
}

Function CheckForm ()
{
If (! IsMail (form. Email. value )){
Alert ("your email is invalid! ");
Form. Email. focus ();
Return false;
}
If (! IsEnglish (form. name. value )){
Alert ("the English name is invalid! ");
Form. name. focus ();
Return false;
}
If (! IsChinese (form. cnname. value )){
Alert ("invalid Chinese name! ");
Form. cnname. focus ();
Return false;
}
If (! IsNumber (form. PublicZipCode. value )){
Alert ("the zip code is invalid! ");
Form. PublicZipCode. focus ();
Return false;
}
Return true;
}
// -->
</SCRIPT>

2.6 restrict characters that cannot be entered for Form Items

Software Development Network www.mscto.com

<Script language = "javascript">
<! --

Function contain (str, charset) // string contains the test function
{
Var I;
For (I = 0; I <charset. length; I ++)
If (str. indexOf (charset. charAt (I)> = 0)
Return true;
Return false;
}

Function CheckForm ()
{
If (contain (document. form. NAME. value, "% \ (\)> <") | (contain (document. form. MESSAGE. value, "% \ (\)> <")))
{
Alert ("illegal characters entered ");
Document. form. NAME. focus ();
Return false;
}
Return true;
}
// -->
</Script>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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