How to detect current web page or element direction (rtl/ltr) or any other attribute in javascript?

问题

How can i read any attribute that currently effects an element that is not necessarily style? one such attribute would be "dir".

回答1:

Recently I had similar problem, you can get element's property with window.getComputedStyle and element.currentStyle methods:

    var elem = document.getElementById('test');
    if (window.getComputedStyle) { // all browsers
        cs = window.getComputedStyle(elem, null).getPropertyValue('direction');
    } else {
        cs = elem.currentStyle.direction; // IE5-8
    }
    alert(cs);

jsfiddle ; compatibility info

回答2:

These are generally reflected as properties on the element instance. dir is, for example, as are most others. Some have slightly renamed names (htmlFor instead of for, className instead of class), but for the most part it's 1:1 (target for target, action for action, ...).

References:

• dir in the DOM2 HTML Spec
• dir in the HTML5 Spec

来源：https://stackoverflow.com/questions/16957533/how-to-detect-current-web-page-or-element-direction-rtl-ltr-or-any-other-attri