Now the browser uses multiple windows. Sometimes we close the Page accidentally when writing an article. Next I will introduce you to a prompt when we close the unsaved page, if you click "OK", it will be closed.
Example 1
| The Code is as follows: |
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<! Doctype html public "-// W3C // dtd html 4.0 Transitional // EN">
<Html> <Title> New Document </title>
</Head>
<Script language = "javascript">
Function RunOnBeforeUnload () {window. onbeforeunload = function () {return 'will lose unsaved data! ';}}
</Script>
<Body onload = "RunOnBeforeUnload ()">
Refresh, close, back, F5 Test
</Body>
</Html> |
Although the onbeforeunload event has been eliminated by Web standards, only this event can achieve this effect currently. Fortunately, the browser can support it well.
Test results:
IE6.0, FireFox, and Chrome
The above is just a prompt to the user, which is totally forbidden below
| The Code is as follows: |
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<Script language = "javascript">
// Disable the F5 key
Function document. onkeydown ()
{
If (event. keyCode = 116)
{
Event. keyCode = 0;
Event. cancelBubble = true;
Return false;
}
}
// Disable context menu
Function document. oncontextmenu ()
{
Return false;
}
// The following Code enables full screen display
Function window. onload (){
Var Request = new Array (); // Save the Parameter
Var s = location. search. substring (1 );
If (s & s! = ""){
Var list = s. split ("&");
For (var I = 0; I <list. length; I ++ ){
Var pair = list [I]. split ("= ");
If (pair [0] & pair [0]! = ""){
Request [unescape (pair [0])] = unescape (pair [1]);
}
}
}
Var fullscreen = Request ["fullscreen"];
If (fullscreen! = "Yes "){
Var file = self. location;
Var a = window. open ("about: blank", "", "fullscreen = yes ")
Self. opener = null
Self. close ()
A. location = file + "? Fullscreen = yes ";
}
}
</Script>
<Script language = "Javascript"> <! --
// Shield right-click, Ctrl + N, Shift + F10, F11, F5 refresh, and return keys
// Author: meizz (plum blossom rain) 2002-6-18
Function document. oncontextmenu () {event. returnValue = false;} // right-click the screen
Function window. onhelp () {return false} // block F1 help
Function document. onkeydown ()
{
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) | // shield the unregeed 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. keyCode = 122) {event. keyCode = 0; event. returnValue = false;} // block F11
If (event. ctrlKey & event. keyCode = 78) event. returnValue = false; // block Ctrl + n
If (event. shiftKey & event. keyCode = 121) event. returnValue = false; // block shift + F10
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;
}
}
</Script> |
