英文:
Blazor select onchange event value not changed
问题
我有一个<select>在我的Razor视图中。每当更改选择时，我试图将所选选项保存到数据库。
我可以做到使用<input type="text>或任何类型的输入，但我的选择不起作用。
以下是代码：
<select name="expression@(i)"
@onchange="(async e =>
{
// Test总是等于"1"，这是选择的旧值
var test = e.Value.ToString();
//执行操作
})">
@foreach (var expression in (ExpressionEnum[])Enum.GetValues(typeof(ExpressionEnum)))
{
<option value="@((int)expression)" selected="@(expression == actionItem.ExpressionEnum)">
@expression.ToString()
</option>
}
</select>
如您所述，选择的选项实际上是第一个，"1"。
但即使我尝试选择另一个像"5"这样的选项，test变量仍然等于"1"。
如何获取正确的选择值？
英文:
I have a <select> inside my Razor View. I'm trying to save the selected option in the database whenever the selection is changed.
I'm able to do it with an <input type="text"> or any type of input, but my select doesn't work.
Here is the code :
<select name="expression@(i)"
@onchange="@(async e =>
{
// Test is always equals to "1", which is the old value of the select
var test = e.Value.ToString());
//Do Stuff
})">
@foreach (var expression in (ExpressionEnum[])Enum.GetValues(typeof(ExpressionEnum)))
{
<option value="@((int)actionItem.ExpressionEnum)" selected=@(expression == actionItem.ExpressionEnum)>
@expression.ToString()
</option>
}
</select>
As commented, the selected option of the select is actually the first one, "1".
But even if I try to select another one like the "5", the test variable will remains equal to "1".
How can I get the correct selected value ?
答案1
得分: 2
actionItem.ExpressionEnum在循环中似乎不会更改，该循环将value设置为，我认为是，<select>中每个选项的1。
我认为你应该将此部分更改为：
value="@expression"
英文:
actionItem.ExpressionEnum does not seem to change during the loop which sets value to, what I assume to be, 1 for every option in your <select>.
I believe you should change this part:
value="@((int)actionItem.ExpressionEnum)"
to
value="@expression"
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