为什么JavaScript不适用于Firefox / Chrome但适用于IE？

Question

I've written a simple JavaScript to add options to an HTML Select element, the code looks like this:

 function addOption() {
    var newOption = document.createElement('<option value="TOYOTA">');


    var elSel = document.getElementById('mySelect');
    try{
    elSel.add(newOption,null);
    } //Standard
    catch(ex)
    {elSel.add(newOption);
    } //IE Only
    newOption.innerText = "Toyota";
}

I found online tutorial that shows we need to do something like this to get both Firefox/Chrome and IE work. However, currently only IE will work, for FF/Chrome, when I click on the "Add" button, nothing is added to the dropdown, could anybody help? Thanks in advance.

Answer 1

You are supposed to specify the node name, not an HTML string ala jQuery style to createElement afaik.

var el = document.createElement('option')
  , fc = document.createTextNode('blah')
  , s = document.getElementById('foo');

el.value = 'blah';
el.appendChild( fc );
s.appendChild( el )

Answer 2

If you're going to do a lot of UI manipulation, I suggest using a 3rd party library like jQuery to make this easier and more cross-browser compatible.

 $('#mySelect').
      append($("<option value='TOYOTA'>TOYOTA</option>").
      attr("value",'TOYOTA').
      text('TOYOTA')); 

Answer 3

I'm surprised that even works in IE.

Try replacing everything inside the function with this:

var newOption = document.createElement("option");
newOption.setAttribute("value", "TOYOTA");
newOption.appendChild(document.createTextNode("My toyota"));
var elSel = document.getElementById('mySelect');
elSel.appendChild(newOption)

Answer 4

Use this instead:

var mySelect = document.getElementById("mySelect");
mySelect.add(new Option("Toyota", "TOYOTA"));