javascript - Trouble With Selection Object in Firefox and IE -

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i've got javascript messes selections. full code complicated stuff i'd rather not go right now, i've got smaller test case don't understand here. if load page should see text , 2 buttons.

  1. double click on "some" select it, , click "select". "some" gets span around , becomes gray.
  2. then double click "some" again , hit "unselect". span goes away, , looking @ page content looks it's how started.
  3. double click "some" 1 last time, hit "select" , nothing gets selected.

this last step failing because start , end of selection reported being in different nodes on page, though sure looks same node, , reported being @ position 0 of both nodes. don't understand why it's behaving differently @ step 1, because looks me step 2 made page before step 1. after things weirder. there's similar, not quite same weird behavior in ie9. in chrome it's fine.

anyone know what's going on? why there 2 different text nodes in step 3? why offsets of selections 0 both, when selection seems extend 0 5, in step 1?

this code has other bugs , such (trying multiple selections fails, lots of other things don't work), i'm trying understand case starting point:

<head>  <meta http-equiv="x-ua-compatible" content="ie=edge" />  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>  </head>  <div id="text">some test words</div>  <button onclick='select()'>select</button>  <button onclick='unselect()'>unselect</button>  <div id="log"></div>  <script type='text/javascript'>  function log(message)  {      var log = document.getelementbyid("log");      log.innerhtml += message + "<br>";  }  function logselection(selection)  {      var range = selection.getrangeat(0);      var startcontainer = range.startcontainer;      var endcontainer = range.endcontainer;      log("node types: " + startcontainer.nodetype + ", " + endcontainer.nodetype + ", " + range.commonancestorcontainer.nodetype)      log("startcontainer: " + (startcontainer.nodetype == 3 ? startcontainer.wholetext : startcontainer.innerhtml));      log("endcontainer: " + (endcontainer.nodetype == 3 ? endcontainer.wholetext : endcontainer.innerhtml));      log("commonancestorcontainer: " + (range.commonancestorcontainer.nodetype == 3 ? range.commonancestorcontainer.wholetext : escape(range.commonancestorcontainer.innerhtml)));      log("equal: " + (startcontainer == endcontainer));      log("start: " + range.startoffset + " end: " + range.endoffset);  }  function select()  {      var selection = window.getselection();      var range = selection.getrangeat(0);      var start = range.startoffset;      var end = range.endoffset;      var startcontainer = range.startcontainer;      var endcontainer = range.endcontainer;      logselection(selection);      startcontainer.parentnode.innerhtml = startcontainer.wholetext.substring(0, start)          + "<span style='background-color: gray'>"          + startcontainer.wholetext.substring(start, end)          + "</span>"          + startcontainer.wholetext.substring(end, startcontainer.wholetext.length);      selection.removeallranges();      log("");  }  function unselect()  {      var selection = window.getselection();      logselection(selection);      selection.removeallranges();      var textdiv = $("#text");      log("start: " + escape(textdiv.html()));      textdiv.find("span").each(function () {          var $span = $(this)          $span.replacewith($span.html());      });      log("final: " + escape(textdiv.html()));      log("");  }  </script>

the chrome debugger can show assumptions go awry:

before taking action, dom:

before

after selection, here's how script changed it:

after selection

and finally, after "unselection":

enter image description here

this final display reveals problem: rather concatenating string value nodes, created new one. the parent <div> contains 2 text nodes, selection span them.

to clear, script here problem:

textdiv.find("span").each(function () {     var $span = $(this)     $span.replacewith($span.html()); });

the replacement of span span's html() string creating new text node.


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