[removed] add extra attribute after new Option()

问题:

I have a piece of code that dynamically adds options to a select field depending on some other criteria. It looks somewhat like this:

if (chosen == "a_value") {
  selbox.options[selbox.options.length] = new Option('text_1','value_1');
  selbox.options[selbox.options.length] = new Option('text_2','value_2');
  selbox.options[selbox.options.length] = new Option('text_3','value_3');
}

What I need is to add an extra attribute to that new option that contains a specific value. In this case the attribute will be called "discount" and the value will be an integer. Later on I'll read the attribute values and process them based on the value in the Option field.

So an option will look like this, once the script is ready;

<option value="value_1" discount="integer">text_1</option>

Makes sense?

Now how can I do this without the use of JS frameworks. It's just this small part of code that I need, so a framework would be overkill for this project.

Cheers! :-)

回答1:

you can do something like

var o1 = new Option("key","value");
selbox.options[selbox.options.length] = o1;
o1.setAttribute("key","value");

回答2:

I know this is old but I came across this question when I forgot it's add and not push today.

The correct way is to use select.options.add.

 var opt = document.createElement('option');
 opt.value = 'hello';
 opt.text = 'world';
 opt.setAttribute('data-discount', 'integer');
 selbox.options.add(opt);

回答3:

You can combine this into one line of code:

(selbox.options[selbox.options.length] = new Option("key","value")).setAttribute("key","value");

Note that this will only work if you have just one attribute to add, otherwise you will need a temporary variable.