Here’s a quick way to disable selection on browsers using Javascript. Helpful if you don’t want somebody to select a bunch of text and copy and paste.

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window.onload = function() {
disableSelection(document.body)
}
 
function disableSelection(target){
if (typeof target.onselectstart!="undefined") //IE
target.onselectstart=function(){return false}
else if (typeof target.style.MozUserSelect!="undefined") //Firefox
target.style.MozUserSelect="none"
else //All other ie: Opera
target.onmousedown=function(){return false}
target.style.cursor = "default"
}

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Here’s a really quick way to add a button into an existing page and then have the button call a function that is within greasemonkey script.

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window.addEventListener("load", function(e) {
addButton();
}, false);
 
function addButton(){
var buttonElems = document.getElementsByTagName(’buttonElementName’);
buttonElems[0].innerHTML = buttonElems[0].innerHTML + ‘<input id="greasemonkeyButton" type="button" value="Call Greasemonkey Function" />’
addButtonListener();
}
 
function addButtonListener(){
var button = document.getElementById("greasemonkeyButton");
button.addEventListener(’click’,doMonkey,true);
}
 
function [...]

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JavaScript provides setTimeout(), clearTimeout() , setInterval() and clearInterval() for your javascript timer functions which allows you to run a piece of Javascript code at some point in the future. Here are some explanation of the functions.

setTimeout ( expression, timeout );

setTimeout() returns a numeric timeout ID that can be used to track the timeout. This is [...]

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