将角度强制选择值转换为int [英] Angular cast select value to int

问题描述

我有一个具有不同选择的表单，例如:

I have a form with different selects like :

<select [(ngModel)]="selected.isConnected" (ngModelChange)="formChanged()" name="etat" id="etat" class="form-control">
    <option value="0">Not connected</option>
    <option value="1">Connected</option>
</select> 

我的后端希望在"isConnected"属性中收到一个整数.不幸的是，一旦我更改了select的值，该属性就被强制转换为字符串:

My backend expect to receive an int in the "isConnected" attribute. Unfortunately as soon as I change the value of the select the attribute is cast to a string :

{
    isConnected : "0", // 0 expected
}

对于标准<input>，我可以使用type="number"，但对于<select>，我却一无所知.

For standard <input> I could use type="number" but for a <select> I'm clueless.

是否有一种方法可以强制角度2将数据转换为int?

Is there a way to force angular 2 to cast the data to int ?

推荐答案

使用[ngValue]代替"value":

Use [ngValue] instead of "value":

<select [(ngModel)]="selected.isConnected" id="etat">
    <option [ngValue]="0">Not connected</option>
    <option [ngValue]="1">Connected</option>
</select> 

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