问题
There is a select dropdown that currently displays a list of values (All Car Makes). The new requirement is to have sections within the same select dropdown, so that it shows a new set of values (Common Car Makes) under a section and along with the existing (All Car Makes).
How can this be achieved using AngularJS?
Existing code :
<select ng-model="vm.vehicleSelection.selected.make"
ng-options="m for m in vm.vehicleSelection.makes">
<option value="">Please select</option>
</select>
回答1:
This one worked :)
If we have a list for each section of values, we can display it as :
<select
ng-model="vm.vehicleSelection.selected.make" >
<option value="">Please select</option>
<optgroup label="Common Car Makes">
<option ng-repeat="commonMake in vm.vehicleSelection.commonMakes" ng-value="commonMake">{{commonMake}}</option>
</optgroup>
<optgroup label="All Car Makes">
<option ng-repeat="make in vm.vehicleSelection.makes" ng-value="make">{{make}}
</option>
</optgroup>
</select>
来源:https://stackoverflow.com/questions/51306513/how-to-display-sections-within-a-select-dropdown-using-angularjs