角增加了奇怪的选项为选择元素设置模型值时， [英] Angular adds strange options into select element when setting model value

问题描述

我定义为这​​样的选择元素：

I have a select element defined as such:

<select name="country_id" id="country_id" required="required" ng-model="newAddressForm.country_id">
    <option value="">Select Country</option>
    <option ng-repeat="country in countries" value="{{country.id}}">{{country.name}}</option>
</select>

所有的时候我没有设置任何类型的值，其中包含此选择的元素指令工作正常。但是，当我做类似 newAddressForm.country_id = 98 ，而不是用价值98选择该选项，角注入一个新的选择元素的顶部，就像这样：

All works fine when I'm not setting any kind of value in the directive which contains this select element. But when I do something like newAddressForm.country_id = 98, instead of selecting the option with value 98, Angular injects a new one at the top of the select element, like so:

<option value="? string:98 ?"></option>

怎么办？什么样的格式，这是为什么会发生这种情况？需要注意的是，如果我做了的console.log（newAddressForm.country_id）在指令中，我得到一个正常的98，它在生成的HTML只是奇怪。

What gives? What sort of format is this and why does this happen? Note that if I do a console.log(newAddressForm.country_id) in the directive, I get a normal "98", it's just weird in the generated HTML.

编辑： 更新情况的转向使用 NG-选择，但问题仍然存在。

Situation update. Switched to using ng-select, but the issue persists.

怪异的元素不再出现，但是，现在有一个只有一个问号？作为值，并没有标签顶部另一个元素，之一。

The weird element no longer appears, BUT, now there's another element at the top, one that has only a question mark ? as the value, and no label.

这是从我收集的，角的无选择选项。我还是不明白为什么它不会选择选项我告诉它来选择，虽然。

That's, from what I gathered, Angular's "none selected" option. I still don't understand why it won't select the option I tell it to select, though.

做 newAddressForm.country_id = 98 仍没有给出结果。这是为什么？

Doing newAddressForm.country_id = 98 still gives no results. Why is that?

推荐答案

角没有一个select元素的值设置为数组的实际值，并做一些内在的东西来管理范围约束力。见马克Rajcok的第一个评论在此链接：

Angular does not set the value of a select element to the actual values of your array and does some internal things to manage the scope binding. See Mark Rajcok's first comment at this link:

<一个href=\"http://docs.angularjs.org/api/ng.directive:select\">http://docs.angularjs.org/api/ng.directive:select

当用户选择的选项之一，角使用索引
  （或键）来查找在阵列（或对象）的值 - 即搜索行动
  价值是什么模式设置为。 （因此，该模型没有被设置为所述
  珍惜你在HTML看看！这导致了很多困惑。）

When the the user selects one of the options, Angular uses the index (or key) to lookup the value in array (or object) -- that looked-up value is what the model is set to. (So, the model is not set to the value you see in the HTML! This causes a lot of confusion.)

我不能完全肯定使用 NG-重复是最好的选择。

I'm not entirely sure using an ng-repeat is the best option.

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