如何通过定位值而不是索引来设置选择选项的属性

Question

When a user clicks on a particular div (in my case a palette of swatches) I need that click to set the "selected" attribute of an option in a select list to "selected". This is working when I can target the option by its index with something like this:

onClick="getElementById('the_select')
         .options[2].setAttribute('selected', 'selected');"

But this doesn't work when I try to target the option by its value like this:

 onClick="getElementById('the_select')
         .option[value='blue'].setAttribute('selected', 'selected');"

I need to target the value because in this case "blue" is not always going to be in the same place in the select list.

How can I accomplish this?

Answer 1

我猜你可以做这样的事情：

document.getElementById("my_select").selected=true;

Answer 2

I found a workable solution using straight javascript based on a post by Dave on this thread...

jQuery - setting the selected value of a select control via its text description