以下是困扰很多人(包括我)的问题。
当在AngularJS中使用ng-options指令来填充<select>标记的选项时，我不知道如何为一个选项设置值。这方面的文档确实不清楚——至少对我这样的傻瓜来说是这样。
我可以像这样轻松地设置一个选项的文本:
ng-options="select p.text for p in resultOptions"
例如，当resultOptions为:
[
{
"value": 1,
"text": "1st"
},
{
"value": 2,
"text": "2nd"
}
]
它应该是(可能是)设置选项值最简单的事情，但到目前为止，我只是不明白它。
当前回答
如果你想改变选项元素的值，因为表单最终会提交给服务器，而不是这样做，
<select name="text" ng-model="text" ng-options="select p.text for p in resultOptions"></select>
你可以这样做:
<select ng-model="text" ng-options="select p.text for p in resultOptions"></select>
<input type="hidden" name="text" value="{{ text }}" />
然后，期望的值将以正确的名称通过表单发送。
其他回答
<select ng-model="color" ng-options="(c.name+' '+c.shade) for c in colors"></select><br>
如果你想改变选项元素的值，因为表单最终会提交给服务器，而不是这样做，
<select name="text" ng-model="text" ng-options="select p.text for p in resultOptions"></select>
你可以这样做:
<select ng-model="text" ng-options="select p.text for p in resultOptions"></select>
<input type="hidden" name="text" value="{{ text }}" />
然后，期望的值将以正确的名称通过表单发送。
你可以这样做:
<select ng-model="model">
<option value="">Select</option>
<option ng-repeat="obj in array" value="{{obj.id}}">{{obj.name}}</option>
</select>
- - -更新
经过一些更新后，用户frm。Adiputra的解决方案要好得多。代码:
obj = { '1': '1st', '2': '2nd' };
<select ng-options="k as v for (k,v) in obj"></select>
在ng-options中选择一个项目可能有点棘手，这取决于您如何设置数据源。
在与它们斗争了一段时间后，我最终用我使用的最常用的数据源制作了一个样本。你可以在这里找到它:
http://plnkr.co/edit/fGq2PM?p=preview
现在要让ng-options工作，需要考虑以下几点:
Normally you get the options from one source and the selected value from other. For example: states :: data for ng-options user.state :: Option to set as selected Based on 1, the easiest/logical thing to do is to fill the select with one source and then set the selected value trough code. Rarely would it be better to get a mixed dataset. AngularJS allows select controls to hold more than key | label. Many online examples put objects as 'key', and if you need information from the object set it that way, otherwise use the specific property you need as key. (ID, CODE, etc.. As in the plckr sample) The way to set the value of the dropdown/select control depends on #3, If the dropdown key is a single property (like in all examples in the plunkr), you just set it, e.g.: $scope.dropdownmodel = $scope.user.state; If you set the object as key, you need to loop trough the options, even assigning the object will not set the item as selected as they will have different hashkeys, e.g.: for (var i = 0, len = $scope.options.length; i < len; i++) { if ($scope.options[i].id == savedValue) { // Your own property here: console.log('Found target! '); $scope.value = $scope.options[i]; break; } }
您可以在另一个对象$scope.myObject.myProperty中替换相同属性的savedValue。
就像很多人之前说的，如果我有这样的数据:
countries : [
{
"key": 1,
"name": "UAE"
},
{
"key": 2,
"name": "India"
},
{
"key": 3,
"name": "OMAN"
}
]
我会这样使用它:
<select
ng-model="selectedCountry"
ng-options="obj.name for obj in countries">
</select>
在你的控制器中，你需要设置一个初始值来消除第一个空项:
$scope.selectedCountry = $scope.countries[0];
// You need to watch changes to get selected value
$scope.$watchCollection(function() {
return $scope.selectedCountry
}, function(newVal, oldVal) {
if (newVal === oldVal) {
console.log("nothing has changed " + $scope.selectedCountry)
}
else {
console.log('new value ' + $scope.selectedCountry)
}
}, true)
