key-value pairs in ng-options

问题

I need to use an associative array as data source for my select options using AngularJS.

Is it possible to use an array like this?

{
    \"key1\": \"val1\",
    \"key2\": \"val2\",
    \"key3\": \"val3\",
    ...
}

and get something like this:

<select>
    <option value=\"key1\">val1</option>
    <option value=\"key2\">val2</option>
    <option value=\"key3\">val3</option>
    ...
</select>

I read docs, but I can\'t understand how to achieve this.

回答1:

use ng-option:

<select ng-model="blah" ng-options="key as value for (key , value) in data"></select>

or use ng-repeat:

<select>
    <option ng-repeat="(key, value) in data" value="{{key}}">{{value}}</option>
</select>

data in controller:

$scope.data = {
    "key1": "val1",
    "key2": "val2",
    "key3": "val3",
    ...
};

回答2:

The following article discusses the variety of ways that you can use ngOptions (by far the clearest, most thorough explanation I've ever seen): http://www.undefinednull.com/2014/08/11/a-brief-walk-through-of-the-ng-options-in-angularjs/

回答3:

Answer by Chen-Tsu Lin actually gives both ways of accessing objects. Just want to add few more lines -

Because the ng-repeat directive repeats a block of HTML code for each item in an array, it can be used to create options in a dropdown list, but the ng-options directive was made especially for filling a dropdown list with options and has at least one important advantage:

Dropdowns made with ng-options allows the selected value to be an object, while dropdowns made from ng-repeat has to be a string.

Adding an example for the reference:

ng-repeat : http://www.w3schools.com/angular/tryit.asp?filename=try_ng_select_repeat_selected

ng-options: http://www.w3schools.com/angular/tryit.asp?filename=try_ng_select_object

For complete reference, head onto http://www.w3schools.com/angular/angular_select.asp

来源：https://stackoverflow.com/questions/21734524/key-value-pairs-in-ng-options