Javascript导致IE8错误

Question

I have a js function which is called onchange of a drop-down. It works in FF, IE6 and 7 and Safari. In IE8 however the function breaks at the following line.

document.getElementById("shipModeId_1").options[document.getElementById("shipModeId_1").options.length]
  = Option(ship_modeId,selcted); 

It says Object doesn't support this property or method. Any idea why this is happening?

Thanks,

Sarego

Answer 1

You missed the new operator. Also you probably want to pass in the same value for the text and the value arguments, with selected following that. The two-argument form of the Option constructor takes text and value , not selected .

new Option(ship_modeId, ship_modeId, selected)

Answer 2

If this is for a <select> , I don't think you need "options".

document.getElementById("shipModeId_1")[document.getElementById("shipModeId_1").length]  = new Option(ship_modeId,selcted); 

You also missed "new" in generating the new option.

Answer 3

Use this,

var drpDown = document.getElementById("shipModeId_1");
drpDown.options[drpDown.options.length] = new Option(ship_modeId,selcted);