To determine if a text is in an RTL or LTR language, you can analyze the text's Unicode character set.

getTextDirection.js

function getTextDirection(text) {
  // Regular expression to match RTL Unicode characters
  var rtlChars = /[\u0600-\u06FF\u0750-\u077F\u0590-\u05FF\u08A0-\u08FF\uFB50-\uFDCF\uFDF0-\uFDFF\uFE70-\uFEFF]/;

  // Regular expression to match LTR Unicode characters
  var ltrChars = /[\u0000-\u05FF\u0700-\u08FF\uFB00-\uFB4F\uFB50-\uFDFF\uFE70-\uFEFF]/;

  // Count the number of RTL and LTR characters in the text
  var rtlCount = (text.match(rtlChars) || []).length;
  var ltrCount = (text.match(ltrChars) || []).length;

  // Return the text direction based on the character count
  if (rtlCount > 0 && ltrCount === 0) {
    return 'rtl';
  } else if (ltrCount > 0 && rtlCount === 0) {
    return 'ltr';
  } else {
    return 'auto';
  }
}