javascript - Superscripts and subscripts in HTML input -


i making small javascript web app deals chemical formulas, need allow users input superscripts. easiest thing users having text editor switch superscript when press ^. how can html textarea?

borrowing function in adeneo's answer

check fiddle here : fiddle

usage : type superscript , press ^ --> type in superscript --> press esc , superscript appear in textarea.

$(document).ready(function() {    var temp = {}; // store keypresses here    var current_value = "";    $("#text_area").keydown(function(e) {      temp[e.which] = true;    });    $('#text_area').keyup(function(e) {      if (e.keycode == 27 && current_value != "") {        var length_1 = current_value.length;        var length_without_sup = length_1 - 5;        var substr_superstring = $('#text_area').val().substr(length_without_sup);        var current_text_2 = current_value + substr_superstring;        current_text_2 = current_text_2 + "</sup>";        $('#text_area').val(current_text_2);        $('#text_area').superscript();      }      var flag_shift = false;      var flag_super = false;      (var key in temp) {        if (key == 16) {          flag_shift = true;        } else if (key == 54) {          flag_super = true;        }      }      if (flag_shift == true && flag_super == true) {        var current_text = $('#text_area').val();        current_text_2 = current_text.substr(0, current_text.length - 1);        current_text_2 = current_text_2 + "<sup>";        $('#text_area').val(current_text_2);        current_value = hide_superscript_tag();      }      delete temp[e.which];    });  });    function hide_superscript_tag() {    var current_value = $('#text_area').val();    current_value_2 = current_value.substr(0, current_value.length - 5);    $('#text_area').val(current_value_2);    return current_value;  }  $.fn.superscript = function() {    var chars = '+−=()0123456789aaÆᴂɐɑɒbbcɕddðeeƎəɛɜɜfggɡɣhhɦiiɪɨᵻɩjjʝɟkkllʟᶅɭmmɱnnɴɲɳŋooɔᴖᴗɵȢppɸqrrɹɻʁsʂʃttƫuuᴜᴝʉɥɯɰʊvvʋʌwwxyzʐʑʒꝯᴥβγδθφχнნʕⵡ',      sup = '⁺⁻⁼⁽⁾⁰¹²³⁴⁵⁶⁷⁸⁹ᴬᵃᴭᵆᵄᵅᶛᴮᵇᶜᶝᴰᵈᶞᴱᵉᴲᵊᵋᶟᵌᶠᴳᵍᶢˠʰᴴʱᴵⁱᶦᶤᶧᶥʲᴶᶨᶡᴷᵏˡᴸᶫᶪᶩᴹᵐᶬᴺⁿᶰᶮᶯᵑᴼᵒᵓᵔᵕᶱᴽᴾᵖᶲqʳᴿʴʵʶˢᶳᶴᵀᵗᶵᵁᵘᶸᵙᶶᶣᵚᶭᶷᵛⱽᶹᶺʷᵂˣʸᶻᶼᶽᶾꝰᵜᵝᵞᵟᶿᵠᵡᵸჼˤⵯ';      return this.each(function() {      this.value = this.value.replace(/<sup[^>]*>(.*?)<\/sup>/g, function(x) {        var str = '',          txt = $.trim($(x).unwrap().text());          (var = 0; < txt.length; i++) {          var n = chars.indexof(txt[i]);          str += (n != -1 ? sup[n] : txt[i]);        }        return str;      });    });  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <textarea id="text_area">  </textarea>


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