[英]How to avoid empty automatic option in an angularjs select?
<form ng-show="editingUser" class="form-inline editingUser" role="form" name="gebruikerdetailform" novalidate>
<input type="text" class="form-control" ng-model="userDetail.name" placeholder="Naam" ng-required="true"/>
<input type="text" class="form-control" ng-model="userDetail.surname" placeholder="Surname"/>
<select class="form-control" ng-model="userDetail.role">
<option ng-selected="userDetail.role === 'user' || userDetail.role === ''" >user</option>
<option ng-selected="userDetail.role === 'admin'">admin</option>
</select>
</form>
在此代码中,由angularjs自动创建空选项<option value="? string: ?"></option>
。 我知道它会在ng-options中不存在ng-model引用的值时发生。 但这不是事实,我不知道如何避免这种行为以及它来自何处。 有任何想法吗?
如果问题与ng-model的初始化有关,则可以使用指令ng-init
,如下所示:
<form ng-show="editingUser" class="form-inline editingUser" role="form" name="gebruikerdetailform" novalidate>
<input type="text" class="form-control" ng-model="userDetail.name" placeholder="Naam" ng-required="true"/>
<input type="text" class="form-control" ng-model="userDetail.surname" placeholder="Surname"/>
<select class="form-control" ng-model="userDetail.role" ng-init="user">
<option ng-selected="userDetail.role === 'user' || userDetail.role === ''" >user</option>
<option ng-selected="userDetail.role === 'admin'">admin</option>
</select>
</form>
查看select定义中ng-init
指令的用法。
有关更多信息: https : //docs.angularjs.org/api/ng/directive/ngInit
干杯
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