只能添加 dom 元素但不能删除它们

Question

i am not able to remove elements from the dom. i am using firfox. my code looks like this

i have a form for which all text boxes should be filled before submission. my form looks like this

<form name="form" method="post" action="url" onsubmit="return checkEmpty(this)" >
<div class="field">
<label>field1</label><input type="text" name="f1" />
</div>
<div class="field">
<label>field2</label><input type="text" name="f2" />
</div>
..
....
......
input type="submit" name="Submit" value="submit" />
</form>

what i do here is that when a form is submitted i check if any text box is empty and if there is any i create a dom element h3 and append it to the div of that corresponding field and if the text box is not empty i check if there is any text box attached to that corresponding field and if i find one i remove it. here is my javascript code

function checkEmpty(form) {
   var textboxes=form.elements;
   for(var i=0;i<textboxes.length;i++)
   {
      if((textboxes[i].type=="text" || textboxes[i].type=="password") && textboxes[i].textLength==0)                  //text box is empty,this code works in firefox but not in chrome                     
      {
         var msg=document.createElement('h3');
         msg.innerHTML="u cant leave this field blank";
         textboxes[i].parentNode.appendChild(msg);
         return false;
      }
      else                      //text box is not empty,this code neither works in firefox nor in chrome 
      {
         var rem_msg=textboxes[i].parentNode.getElementsByTagName('h3');
         for(var j=0;j<rem_msg.length;j++)
            textboxes[i].parentNode.removeChild(rem_msg[j]);
      }
   }
}

Until i was not removing elements the code was working fine but removing element is neccessary because for example a user doesnt enter any value in text box 1 on first attempt so an h3 element would be added but now he enters some text in first text box but leaves second text box empty so the h3 element of first text box should dissappear. the code looks really simple, i am getting the reference of a node and then passing in to appendChild or removeChild . Also i am not even able to add elements to the dom in google chrome

Answer 1

Try this one:

 rem_msg[j].parentNode.removeChild(rem_msg[j]);

Answer 2

if you change the line that creates the error to if ((textboxes[i].type == "text" || textboxes[i].type == "password") && textboxes[i].value == "") possible will work