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/**
* Get element's style for a specific css property
*
* @param {Element} element The element on which to retrieve the style
* @param {String} property The CSS property to retrieve ("float", "display", "text-align", ...)
*
* @example
* wysihtml5.dom.getStyle("display").from(document.body);
* // => "block"
*/
wysihtml5.dom.getStyle = (function() {
var stylePropertyMapping = {
"float": ("styleFloat" in document.createElement("div").style) ? "styleFloat" : "cssFloat"
},
REG_EXP_CAMELIZE = /\-[a-z]/g;
function camelize(str) {
return str.replace(REG_EXP_CAMELIZE, function(match) {
return match.charAt(1).toUpperCase();
});
}
return function(property) {
return {
from: function(element) {
if (element.nodeType !== wysihtml5.ELEMENT_NODE) {
return;
}
var doc = element.ownerDocument,
camelizedProperty = stylePropertyMapping[property] || camelize(property),
style = element.style,
currentStyle = element.currentStyle,
styleValue = style[camelizedProperty];
if (styleValue) {
return styleValue;
}
// currentStyle is no standard and only supported by Opera and IE but it has one important advantage over the standard-compliant
// window.getComputedStyle, since it returns css property values in their original unit:
// If you set an elements width to "50%", window.getComputedStyle will give you it's current width in px while currentStyle
// gives you the original "50%".
// Opera supports both, currentStyle and window.getComputedStyle, that's why checking for currentStyle should have higher prio
if (currentStyle) {
try {
return currentStyle[camelizedProperty];
} catch(e) {
//ie will occasionally fail for unknown reasons. swallowing exception
}
}
var win = doc.defaultView || doc.parentWindow,
needsOverflowReset = (property === "height" || property === "width") && element.nodeName === "TEXTAREA",
originalOverflow,
returnValue;
if (win.getComputedStyle) {
// Chrome and Safari both calculate a wrong width and height for textareas when they have scroll bars
// therfore we remove and restore the scrollbar and calculate the value in between
if (needsOverflowReset) {
originalOverflow = style.overflow;
style.overflow = "hidden";
}
returnValue = win.getComputedStyle(element, null).getPropertyValue(property);
if (needsOverflowReset) {
style.overflow = originalOverflow || "";
}
return returnValue;
}
}
};
};
})();
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