CODEWITHSUNDEEP
javascriptjquerydynamic
Jesse Aldridge
Jesse Aldridge

Reputation: 8149

Dynamically modified value of input not reflected in DOM

How can I get the DOM to reflect the modified input value?

<div>
  <input value='0'>
</div>
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js'></script>

<script>
setInterval(function() {
  $('input').val(parseInt($('input').val()) + 1)
  console.log('div.html(): ', $('div').html())
}, 1000)
</script>

Upvotes: 7

Views: 11145

Answers (3)

mutex
mutex

Reputation: 7728

The following seems to work for me:

http://jsfiddle.net/h8AP8/1/

All credit to gnarf here and his formhtml:

jQuery html() in Firefox (uses .innerHTML) ignores DOM changes

So your modified code would be:

<div>
  <input value='0'>
</div>
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js'></script>

<script>
(function($) {
  var oldHTML = $.fn.html;

  $.fn.formhtml = function() {
    if (arguments.length) return oldHTML.apply(this,arguments);
    $("input,button", this).each(function() {
      this.setAttribute('value',this.value);
    });
    $("textarea", this).each(function() {
      // updated - thanks Raja!
      this.innerHTML = this.value;
    });
    $("input:radio,input:checkbox", this).each(function() {
      // im not really even sure you need to do this for "checked"
      // but what the heck, better safe than sorry
      if (this.checked) this.setAttribute('checked', 'checked');
      else this.removeAttribute('checked');
    });
    $("option", this).each(function() {
      // also not sure, but, better safe...
      if (this.selected) this.setAttribute('selected', 'selected');
      else this.removeAttribute('selected');
    });
    return oldHTML.apply(this);
  };

  //optional to override real .html() if you want
  // $.fn.html = $.fn.formhtml;
})(jQuery);


setInterval(function() {
  $('input').val(parseInt($('input').val()) + 1)
  console.log('div.html(): ', $('div').formhtml())
}, 1000)
</script>

Upvotes: 4

Jacco
Jacco

Reputation: 3272

I'm sorry, but the problem is not in the example code you supplied. Or when this is the only html in your page, then you're missing the starting and closing tags.

This clean page runs perfectly on my machine:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head></head>
    <body>
        <div><input value='0'></div>

        <script src='http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js'></script>
        <script>
        setInterval(function() {
          $('input').val(parseInt($('input').val()) + 1)
          console.log('div.html(): ', $('div').html())
        }, 1000);
        </script>
    </body>
</html>

Or are you testing in Internet Explorer? In that case, remove the line which is logging to your error console:

console.log('div.html(): ', $('div').html())

Upvotes: 0

Oliver Moran
Oliver Moran

Reputation: 5167

Try changing the DOM directly. For example:

<div id="myDiv">
  <input id="myInput" value='0'>
</div>

<script>
setInterval(function() {
    var v = parseInt(document.getElementById("myInput").value) + 1;
    document.getElementById("myInput").setAttribute("value",v);
}, 1000);
</script>

<input type="button" onclick="javascript:alert(document.getElementById('myDiv').innerHTML);" value="Click to see DOM" />

Upvotes: 6

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