Created
September 16, 2014 09:37
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Convert CSS values to a usable number, parses calc() for a single depth only
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/** | |
* Convert a css number type string into pixel units | |
* @param {jQuerySelector} $el | |
* @param {String} value | |
* @param {?Boolean} horiz | |
* @returns {Number} | |
*/ | |
function convertCSS($el, value, horiz) { | |
var val = parseFloat(value); | |
// console.log("convertCSS", value, value.replace(/[^a-z%]/g, ""), horiz) | |
switch (value.replace(/[^a-z%]/g, "").substr(0, 4)) { | |
case "none": | |
val = 0; | |
break; | |
case "calc": | |
var operand, num, | |
sum = value.replace(/^calc\(|\)$/g, "").split(" "); | |
val = convertCSS($el, sum.shift(), horiz); | |
while (sum.length) { | |
if (operand) { | |
num = convertCSS($el, sum.shift(), horiz); | |
if (operand === "+") { | |
val += num; | |
} else if (operand === "-") { | |
val -= num; | |
} else if (operand === "*") { | |
val *= num; | |
} else if (operand === "/") { | |
val /= num; | |
} | |
operand = ""; | |
} else { | |
operand = sum.shift(); | |
} | |
} | |
break; | |
case "em": | |
val *= parseFloat($el.css("fontSize")); | |
break; | |
case "percent": | |
val *= $el.offsetParent()[horiz ? "width" : "height"]() / 100; | |
break | |
case "rem": | |
val *= parseFloat($("html").css("fontSize")); | |
break; | |
case "vh": | |
val *= window.innerHeight / 100; | |
break; | |
case "vw": | |
val *= window.innerWidth / 100; | |
break; | |
case "vmin": | |
val *= Math.min(window.innerWidth, window.innerHeight) / 100; | |
break; | |
case "vmax": | |
val *= Math.max(window.innerWidth, window.innerHeight) / 100; | |
break; | |
case "px": | |
case "": | |
break; | |
default: | |
console.warn("convertCSS: Unknown conversion type!! (" + value + ")"); | |
} | |
// console.log("=", val); | |
return value; | |
} |
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