javascript - Simulate backspace button JS -


i want create custom backspace button same logic "backspace" button on keyboard. use following code: 

function backspace()  {      var e = jquery.event("keyup");      e.which = 8; // # key code value      e.keycode = 8;      $("maindiv").trigger(e);  }
<!doctype html>  <html>      <head>          <link rel="stylesheet" href="styles.css" type="text/css" media="screen" />          <script src="formulas.js"></script>          <script src="http://code.jquery.com/jquery-1.11.3.js"></script>          <meta name="viewport" content="width=device-width initial-scale=1.0 maximum-scale=1.0 user-scalable=no"/>      </head>        <button onclick="backspace()">backspace</button>      <body id="main" spellcheck="false">          <div id = "maindiv" contenteditable="true"></div>      </body>  </html>

but doesn't work. don't understand i'm doing wrong. spend lot of time problem, haven't solved yet. me, please.

addition @coslu's answer

jsbin here also

function backspace() {    p = document.getelementbyid("maindiv");    c = getcaretposition(p);    console.log(getcaretposition(p));    str = $("#maindiv").html();    if (c > 0 && c <= str.length) {      $("#maindiv").focus().html(str.substring(0, c - 1) + str.substring(c, str.length));        p.focus();      var textnode = p.firstchild;      var caret = c - 1;       var range = document.createrange();      range.setstart(textnode, caret);      range.setend(textnode, caret);      var sel = window.getselection();      sel.removeallranges();      sel.addrange(range);    }  }    $.fn.setcursorposition = function(pos) {    this.each(function(index, elem) {      if (elem.setselectionrange) {        elem.setselectionrange(pos, pos);      } else if (elem.createtextrange) {        var range = elem.createtextrange();        range.collapse(true);        range.moveend('character', pos);        range.movestart('character', pos);        range.select();      }    });    return this;  };    function getcaretposition(editablediv) {    var caretpos = 0,      sel, range;    if (window.getselection) {      sel = window.getselection();      if (sel.rangecount) {        range = sel.getrangeat(0);        if (range.commonancestorcontainer.parentnode == editablediv) {          caretpos = range.endoffset;        }      }    } else if (document.selection && document.selection.createrange) {      range = document.selection.createrange();      if (range.parentelement() == editablediv) {        var tempel = document.createelement("span");        editablediv.insertbefore(tempel, editablediv.firstchild);        var temprange = range.duplicate();        temprange.movetoelementtext(tempel);        temprange.setendpoint("endtoend", range);        caretpos = temprange.text.length;      }    }    return caretpos;  }
<!doctype html>  <html>    <head>    <meta charset="utf-8">    <title>js bin</title>    <script src="http://code.jquery.com/jquery-1.11.3.js"></script>  </head>    <body>    <button onclick="backspace()">backspace</button>    <div id="maindiv" contenteditable="true">aahahtext</div>  </body>    </html>


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