Rosetta Code:Per-Code Example Buttonbar
//<lang javascript> /*======================================== This comparison script was written by Tyrok1, and has been tested on IE 7, IE 8, Fx 3.6.3, and Fe 5.0.380. ========================================*/
//define the relationship between the CSS classes and the language names var buttonBarCodepadLanguages = [ { cssClass: "c", padName: "C" }, { cssClass: "cpp", padName: "C++" }, { cssClass: "d", padName: "D" }, { cssClass: "haskell", padName: "Haskell" }, { cssClass: "lua", padName: "Lua" }, { cssClass: "ocaml", padName: "OCaml" }, { cssClass: "php", padName: "PHP" }, { cssClass: "perl", padName: "Perl" }, { cssClass: "python", padName: "Python" }, { cssClass: "ruby", padName: "Ruby" }, { cssClass: "scheme", padName: "Scheme" }, { cssClass: "tcl", padName: "Tcl" } ];
function AddHandler(el, handlerType, func) { //add an event handler in a more cross-browser way if(el.addEventListener) { el.addEventListener(handlerType, func, false); } else if(el.attachEvent) { el.attachEvent("on" + handlerType, func); } else { eval("el.on" + handlerType + " = func;"); } }
function IsChild(parent, child) { //check to see if an element is a child of another element while(child && child != parent) { child = child.parentNode; } return (child == parent); }
function ButtonBarSelectAll(preEl) {
//select all code within a given element
var range = null;
var menuEl = preEl.getElementsByTagName("ul")[0];
if(((document.createRange && (range = document.createRange())) || (document.selection.createRange && (range = document.selection.createRange()))) && range.selectNodeContents)
{
//for Fx, Fe, and other more standards-compliant browsers
range.selectNodeContents(preEl);
range.setEndBefore(menuEl);
var sel = window.getSelection();
if(sel.setBaseAndExtent)
{
//odd variant of a few of the WebKit browsers
sel.setBaseAndExtent(preEl, 0, menuEl, 0);
}
else
{
sel.removeAllRanges();
sel.addRange(range);
}
}
else
{
//for IE
range = document.body.createTextRange();
range.moveToElementText(preEl);
var menuRange = document.body.createTextRange();
menuRange.moveToElementText(menuEl);
//deselect the popup menu
while(range.compareEndPoints("EndToStart", menuRange) > 0)
{
range.moveEnd("word", -1);
}
range.select();
}
//return the range so other functions can use it
return range;
}
function ButtonBarCreateSelectAll(preEl)
{
return function() {
//select all of the text in the pre element
ButtonBarSelectAll(preEl);
};
}
function ButtonBarCreateCopy(preEl)
{
return function() {
//copy all of the text in the pre element
//IE-only at this point
var range = ButtonBarSelectAll(preEl);
range.execCommand("Copy");
};
}
function ButtonBarGetText(preEl)
{
//get the code from inside of a element
var outText = "";
for(var c = 0; c < preEl.childNodes.length; ++c)
{
switch(preEl.childNodes[c].tagName ? preEl.childNodes[c].tagName.toLowerCase() : "")
{
case "br":
{
outText += "\n";
} break;
case "ul":
{
//get rid of s
outText = outText.replace(/\xA0/g, " ");
//return the cleaned text
return outText;
} break;
case "":
{
//no tag name
//probably just text
outText += (preEl.childNodes[c].textContent ? preEl.childNodes[c].textContent : (preEl.childNodes[c].innerText ? preEl.childNodes[c].innerText : preEl.childNodes[c].data));
} break;
default:
{
outText += ButtonBarGetText(preEl.childNodes[c]);
}
}
}
//get rid of s
outText = outText.replace(/\xA0/g, " ");
//return the cleaned text
return outText;
}
function ButtonBarAddSpacer(ulEl)
{
//add a spacer bullet item to the menu list
var spacerEl = ulEl.appendChild(document.createElement("li"));
spacerEl.appendChild(document.createTextNode("\u2022"));
spacerEl.style.display = "inline";
spacerEl.style.marginLeft = "0.5em";
spacerEl.style.marginRight = "0.5em";
}
function ButtonBarCreateMouseOver(preEl)
{
//the mouseover event handler for elements
return function() {
//if there's already a menu, don't add another
if(preEl.getElementsByTagName("ul").length > 0)
{
return false;
}
//style the and add the menu
preEl.style.position = "relative";
var ulEl = preEl.appendChild(document.createElement("ul"));
ulEl.className = "ButtonBar";
ulEl.style.position = "absolute";
ulEl.style.right = 0;
ulEl.style.top = 0;
ulEl.style.whitespace = "nowrap";
ulEl.style.marginRight = "0.5em";
//define actions we want to add
var listItems = [
{title:"Select All",code:ButtonBarCreateSelectAll(preEl)}
];
if(window.clipboardData)
{
listItems[listItems.length] = {title:"Copy to Clipboard",code:ButtonBarCreateCopy(preEl)};
}
//add the standard menu items
for(var i = 0; i < listItems.length; ++i)
{
//if it's not the first one, add a spacer
if(i > 0)
{
ButtonBarAddSpacer(ulEl);
}
var liEl = ulEl.appendChild(document.createElement("li"));
liEl.appendChild(document.createTextNode(listItems[i].title));
liEl.style.cursor = "pointer";
liEl.style.display = "inline";
liEl.style.fontFamily = "sans-serif";
liEl.style.textDecoration = "underline";
AddHandler(liEl, "click", listItems[i].code);
}
//check for a codepad-supported language
var langClass = preEl.className.split(" ")[0];
for(var l = 0; l < buttonBarCodepadLanguages.length; ++l)
{
if(langClass == buttonBarCodepadLanguages[l].cssClass)
{
//found the language
//add , add a mouseout handler and return
if(!e) e = window.event;
var target = e.relatedTarget || e.toElement;
if(IsChild(preEl, target))
{
AddHandler(target, "mouseout", ButtonBarCreateMouseOut);
return false;
}
//we're moving away from the container , so we need to remove all menu lists
var ulEls = preEl.getElementsByTagName("ul");
for(var u = 0; u < ulEls.length; ++u)
{
ulEls[u].parentNode.removeChild(ulEls[u]);
}
return false;
};
}
function ButtonBarActivate()
{
//check to see if we're looking at a task page
var catLinksEl = document.getElementById("catlinks");
var isTask = false;
if(catLinksEl)
{
var aEls = catLinksEl.getElementsByTagName("a");
for(var a = 0; a < aEls.length; ++a)
{
if(aEls[a].getAttribute("title") == "Category:Programming Tasks")
{
//it's a task
isTask = true;
break;
}
}
}
if(!isTask)
{
return;
}
//look for language examples
var allPres = document.getElementsByTagName("pre");
for(var p = 0; p < allPres.length; ++p)
{
if(allPres[p].className && allPres[p].className.indexOf("highlighted_source") >= 0)
{
//set up the onmouseover, onmousleave events to show/hide the button bar
AddHandler(allPres[p], "mouseover", ButtonBarCreateMouseOver(allPres[p]));
AddHandler(allPres[p], "mouseout", ButtonBarCreateMouseOut(allPres[p]));
}
}
}
//register the comparison script with the window's load event
AddHandler(window, "load", ButtonBarActivate);
//</lang>