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Summary of practical javascript technology (1) Blocking

Source: Internet
Author: User
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Summary of practical javascript technology (1) Blocking

1. Shield all keyboard keys
<Script language = "JavaScript">
<! --
Function document. onkeydown (){
Event. keycode = 0;
Event. returnvalue = false;
}
-->
</SCRIPT>

2. Right-click the screen

Add oncontextmenu = self. event. returnvalue = false or:
<Script language = "JavaScript">
<! --
Function document. oncontextmenu ()
{
Return false;
}
-->
</SCRIPT>
<Script language = JavaScript>
Function click (){
If (event. Button = 2 ){
Alert ('Sorry, this page cannot be copied! ')
}
}
Document. onmousedown = click
</SCRIPT>

Function nocontextmenu ()
{
If (document. All ){
Event. cancelbubble = true;
Event. returnvalue = false;
Return false;
}
}
Or:
<Body onmousedown = "rclick ()" oncontextmenu = "nocontextmenu ()">

<Script language = "JavaScript">
<! --
Function rclick ()
{
If (document. All ){
If (event. Button = 2 ){
Event. returnvalue = false;
}
}
}
-->
</SCRIPT>

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 Alt + direction keys pop up a warning box, press and hold the Alt key, and drop the warning box with the mouse, this blocking method will become invalid.
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>

4. shield the "minimize", "maximize", and "close" key in the upper right corner of the browser
<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.
<Script language = "JavaScript">
<! --
Window. Open (www.32pic.com, "32pic", "fullscreen = 3, Height = 100, width = 400,
Top = 0, Left = 0, toolbar = No, menubar = No, scrollbars = No, resizable = No, location = No,
Status = No ");
-->
</SCRIPT>

Note: add the following content to the Body Tag:
Onbeforeunload = "javascript: Return false" // disable the window

5. shield the F5 key
<Script language = "JavaScript">
<! --
Function document. onkeydown ()
{
If (event. keycode = 116)
{
Event. keycode = 0;
Event. cancelbubble = true;
Return false;
}
}
-->
</SCRIPT>

6. Block the IE backend button
Use
<A href = "javascript: location. Replace (URL)">

7. Shielding the scroll bar of the Main Window
Add
Style = "overflow-Y: hidden"

8. shield the clipboard and clear the clipboard constantly.
Add
Onload = "setinterval ('clipboarddata. setdata (/'text/',/') ', 100 )"

9. Shielding website Printing
<Style>
@ Media Print {
* {Display: None}
}
</Style>

10. Disable the Save icon automatically displayed on ie6.0 Images
Method 1:
<Meta HTTP-EQUIV = "imagetoolbar" content = "no">

Method 2:

11. Shield all scripts on the page
<Noscrrept> </NoScript>

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