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demo.js
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var keyWhitelist =
[
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
".",
",",
"r",
"/",
"∶",
"∕",
"=",
"ArrowLeft",
"ArrowRight",
"Home",
"End",
"Backspace",
"Delete",
"Cancel",
"Tab",
"Enter",
"Escape"
];
window.caret = 0;
function keydown(event) {
if(keyWhitelist.indexOf(event.key) < 0)
return true;
if(event.preventDefault)
event.preventDefault();
if(document.getElementsByClassName("focus").length < 1) {
document.getElementById("n1").className = "focus";
window.caret = document.getElementById("n1").innerText.length;
showCaret();
};
var ae = document.getElementsByClassName("focus")[0];
if(window.caret < 0)
window.caret = 0;
if(window.caret > ae.innerText.length)
window.caret = ae.innerText.length;
switch(event.key) {
case "0":
addCharacter("0"); window.caret+= 1; break;
case "1":
addCharacter("1"); window.caret+= 1; break;
case "2":
addCharacter("2"); window.caret+= 1; break;
case "3":
addCharacter("3"); window.caret+= 1; break;
case "4":
addCharacter("4"); window.caret+= 1; break;
case "5":
addCharacter("5"); window.caret+= 1; break;
case "6":
addCharacter("6"); window.caret+= 1; break;
case "7":
addCharacter("7"); window.caret+= 1; break;
case "8":
addCharacter("8"); window.caret+= 1; break;
case "9":
addCharacter("9"); window.caret+= 1; break;
case ".":
(ae.innerHTML.indexOf(".") < 0) ? (
addCharacter(".")
) : null; window.caret+= 1; break;
case ",":
(ae.innerHTML.indexOf(".") < 0) ? (
addCharacter(".")
) : null; window.caret+= 1; break;
case "r":
ae.innerHTML =
(ae.children.length > 0) ? (
ae.innerHTML.replace("<em>", "").replace("</em>", "")
) : (
(ae.innerHTML.indexOf(".") > -1 && ae.innerHTML.indexOf(".") < window.caret) ? (
ae.innerHTML.slice(0, window.caret) + "<em>" +
((window.caret < ae.innerHTML.length) ? (
ae.innerHTML.slice(window.caret)
) : (
""
)
) + "</em>"
) : ae.innerHTML
)
break;
case "ArrowLeft":
(window.caret > 0) ? (window.caret-= 1) : null; break;
case "ArrowRight":
(window.caret < ae.innerText.length) ? (window.caret+= 1) : null; break;
case "Home":
window.caret = 0; break;
case "End":
window.caret = ae.innerText.length; break;
case "Backspace":
(ae.children.length > 0 && (ae.childNodes.length < 2 || ae.childNodes[0].data.length < window.caret)) ? (
ae.children[0].innerHTML =
ae.children[0].innerHTML.slice(0, window.caret - 1 - ((ae.childNodes.length < 2) ? 0 : ae.childNodes[0].data.length))
+
ae.children[0].innerHTML.slice(window.caret - ((ae.childNodes.length < 2) ? 0 : ae.childNodes[0].data.length))
) : (
(ae.innerHTML.length > 0 && window.caret > 0) ? (
ae.innerHTML =
ae.innerHTML.slice(0, window.caret - 1)
+
ae.innerHTML.slice(window.caret)
) : (
window.caret+= 1
)
); window.caret-= 1; break;
case "Delete":
(ae.children.length > 0 && (ae.childNodes.length < 2 || ae.childNodes[0].data.length <= window.caret)) ? (
ae.children[0].innerHTML =
ae.children[0].innerHTML.slice(0, window.caret - ((ae.childNodes.length < 2) ? 0 : ae.childNodes[0].data.length))
+
ae.children[0].innerHTML.slice(window.caret + 1 - ((ae.childNodes.length < 2) ? 0 : ae.childNodes[0].data.length))
) : (
(ae.innerHTML.length > 0 && window.caret <= ae.innerHTML.length) ? (
ae.innerHTML =
ae.innerHTML.slice(0, window.caret)
+
ae.innerHTML.slice(window.caret + 1)
) : null
); break;
case "Cancel":
ae.innerHTML = "";
window.caret = 0;
break;
case "Tab":
case "/":
case "∶":
case "∕":
document.getElementById("n1").className = (document.getElementById("n1").className=="focus") ? "" : "focus";
document.getElementById("n2").className = (document.getElementById("n2").className=="focus") ? "" : "focus";
window.caret = document.getElementsByClassName("focus")[0].innerText.length;
break;
case "=":
case "Enter":
submit(); break;
case "Escape":
ae.className = ""; window.caret = 0; document.getElementById("caret").style.display = "none"; break;
};
if(ae.children.length > 0 && ae.children[0].innerHTML.length < 1 && event.key!="r")
ae.children[0].remove();
if(window.caret < 0)
window.caret = 0;
if(window.caret > ae.innerHTML.length)
window.caret = ae.innerHTML.length;
if(document.getElementsByClassName("focus").length > 0)
showCaret();
if(ae.children.length > 0 && ae.innerText.indexOf(".") < 0)
ae.innerHTML = ae.innerHTML.replace("<em>", "").replace("</em>", "");
return false;
};
function mousedown(event) {
event.preventDefault();
keydown({ key: this.name });
return false;
};
function click(event) {
event.preventDefault();
if(this.className=="focus" || event.target.className=="numpadkey") {
event.stopPropagation();
if(this.className=="focus") {
var pos = Math.round((event.clientX - this.offsetLeft - parseFloat(getComputedStyle(this).paddingLeft)) / window.monospaceWidth);
if(pos > this.innerText.length)
window.caret = this.innerText.length;
else
window.caret = pos;
showCaret();
};
return false;
};
document.getElementById("caret").style.display = "none";
if(document.getElementsByClassName("focus").length > 0)
document.getElementsByClassName("focus")[0].className = "";
window.caret = 0;
if(this.tagName.toLowerCase()=="span") {
this.className = "focus";
var pos = Math.round((event.clientX - this.offsetLeft - parseFloat(getComputedStyle(this).paddingLeft)) / window.monospaceWidth);
if(pos > this.innerText.length)
window.caret = this.innerText.length;
else
window.caret = pos;
showCaret();
event.stopPropagation();
};
return false;
};
function addCharacter(char) {
var ae = document.getElementsByClassName("focus")[0];
if(ae.children.length < 1 || ae.childNodes.length < 2 || window.caret < ae.childNodes[0].length || (window.caret==ae.childNodes[0].length && ae.children[0].innerHTML.length > 0))
ae.innerHTML = ae.innerHTML.slice(0, window.caret) + char + ae.innerHTML.slice(window.caret);
else if(ae.children[0].innerHTML.length < 1 && window.caret >= ae.childNodes[0].length)
ae.innerHTML = ae.childNodes[0].data + "<em>" + char + "</em>";
else
ae.innerHTML = ae.childNodes[0].data + "<em>" + ae.children[0].innerHTML.slice(0, window.caret - ae.childNodes[0].length) + char + ae.children[0].innerHTML.slice(window.caret - ae.childNodes[0].length) + "</em>";
};
function showCaret() {
var caret = document.getElementById("caret");
var ae = document.getElementsByClassName("focus")[0];
if(!ae)
ae = document.getElementById("n1");
caret.style.display = "block";
caret.style.top = document.getElementById("math").offsetTop + "px";
caret.style.left = (ae.offsetLeft + parseFloat(getComputedStyle(ae).paddingLeft) + (window.caret * window.monospaceWidth)) + "px";
};
function submit() {
if(document.getElementById("n1").innerText.indexOf(".")==0)
document.getElementById("n1").innerHTML = "0" + document.getElementById("n1").innerHTML;
if(document.getElementById("n2").innerText.indexOf(".")==0)
document.getElementById("n2").innerHTML = "0" + document.getElementById("n2").innerHTML;
document.getElementById("result").className = "";
if(document.getElementById("n2").innerText.length < 1 || parseFloat(document.getElementById("n2").innerText)==0) {
document.getElementById("result").innerHTML = "Division by zero!";
document.getElementById("result").className = "error";
}
else if(document.getElementById("n1").innerText.length < 1 || parseFloat(document.getElementById("n1").innerText)==0 || (document.getElementById("n1").children.length > 0 && document.getElementById("n1").childNodes.length < 2))
document.getElementById("result").innerHTML = 0;
else {
document.getElementsByTagName("button")[0].className = "computing";
window.setTimeout(function() {
document.getElementById("result").innerHTML = advdiv(document.getElementById("n1").innerHTML, document.getElementById("n2").innerHTML, "−", ".", "<em>", "</em>");
while(true) {
if(document.getElementById("result").innerHTML.length > 0) {
document.getElementsByTagName("button")[0].className = "";
break;
};
};
}, 100);
};
};
window.onresize = function(event) {
var span = document.createElement("span");
span.style.fontFamily = "'Roboto Mono', monospace";
span.style.fontSize = "200%";
span.style.opacity = "0";
while(span.innerHTML.length < 1000) {
span.innerHTML+= "0";
};
document.body.appendChild(span);
window.monospaceWidth = span.offsetWidth / 1000;
span.remove();
if(document.getElementsByClassName("focus").length > 0)
showCaret();
};
document.body.onload = function(event) {
window.onkeydown = keydown;
document.getElementsByTagName("span")[0].onclick = click;
document.getElementsByTagName("span")[1].onclick = click;
document.body.onclick = click;
var x = 0;
var numpadkeys = document.getElementsByClassName("numpadkey");
while(x < numpadkeys.length) {
numpadkeys[x].onmousedown = mousedown;
x++;
};
window.onresize();
};