How to choose default time value in a select box with ng-options

问题

I have a form with select boxes to choose a business' working hours. I want to choose 9:00 am as the default value for the first box, and 5:00 pm as the default value for the second box.

Here is the JSfiddle

For example, I have

<select ng-options="hour as (hour | date: 'shortTime') for hour in hours"
  ng-model="start_time" ng-change="update(start_time, $index, 1)">

If in my app.js I set $scope.start_time equal to a Date object initialized to the current date and time as 9:00 am, the default value is chosen as the last value in the select box instead. Since I am using a date filter to display the time in the select box in the 'shortTime' format, is that the reason why the default value is not being shown correctly?

回答1:

Just set the model start_time right, for example in your controller!

<select ng-options="hour as (hour | date: 'shortTime') for hour in hours track by hour"
        ng-model="start_time" ng-change="update(start_time, $index, 1)">

$scope.start_time = new Date(); // set default date in controller

Using the latest angular version and track by hour solves the problem: http://jsfiddle.net/j8xu1h2h/

来源：https://stackoverflow.com/questions/32999234/how-to-choose-default-time-value-in-a-select-box-with-ng-options