use text-align smartly (if english dir=ltr if arabic dir=rtl)

Question

I have a community web site and I want that users write

• English posts with direction LTR / text-align: left) and
• Arabic posts with direction RTL / tex

Answer 1

Actually the Arabic alphabet letters are these

var RTL = ['ا','ء','ب','ت','ث','ج','ح','خ','د','ذ','ر','ز','س','ش','ص','ض','ط','ظ','ع','غ','ف','ق','ک','ل','م','ن','و','ه','ی'];

and Persian (Farsi) alphabet letters are these

var RTL = ['ا','ب','پ','ت','ث','ج','چ','ح','خ','د','ذ','ر','ز','ژ','س','ش','ص','ض','ط','ظ','ع','غ','ف','ق','ک','گ','ل','م','ن','و','ه','ی'];

and it can be useful if check the first and second letter because sometimes it can starts by a bullet or something like that.

for ( var index = 0; index < divs.length; index++ ) {
    if( checkRtl( divs[index].textContent[0] ) || checkRtl( divs[index].textContent[1] ) ) {
        divs[index].className = 'rtl';
    } else {
        divs[index].className = 'ltr';
    };
};