I have a User Control called 'FileBrowser.' The control contains a ListBox called 'FileList.' The code behind exposes a property:
我有一个名为'FileBrowser'的用户控件。该控件包含一个名为“FileList”的ListBox。后面的代码公开了一个属性：
public string SelectedPath
{ get { return string.IsNullOrEmpty(FileList.SelectedValue) ? "empty" : FileList.SelectedValue; } }
I am accessing this from a page implementing the control using this:
我从一个使用它实现控件的页面访问它：
<script>
function testFunc() {
var s = '<% Response.Write(fileBrowser.SelectedPath);%>';
document.getElementById('<%= textBoxTest.ClientID %>').value = s;
}
</script>
I see some very strange behavior. When I click the button textBoxTest I get the value of SelectedValue from when the button was last clicked.
我看到一些非常奇怪的行为。当我单击按钮textBoxTest时，我从上次单击按钮时获取SelectedValue的值。
Example:
例：
FileList.SelectedPath = Test1
FileList.SelectedPath = Test1
click returns "empty"
点击返回“空”
click again, now it returns "Test1"
再次单击，现在返回“Test1”
Select a new value on the listbox, test2, click again, returns "Test1"
在列表框上选择一个新值test2，再次单击，返回“Test1”
Click again, returns "test2"
再次单击，返回“test2”
I'm very new to ASP.NET and web development in general. I suppose maybe there are some strange life cycle events occuring that I am not familiar with.
我对ASP.NET和Web开发一般都很陌生。我想也许有一些奇怪的生命周期事件发生，我不熟悉。
1 个解决方案
#1
1
When you select a listbox value, it changes in client side. But you are using serverside code to get the value, '<% Response.Write(fileBrowser.SelectedPath);%>' which is still 'empty' (initial value), untill the page is posted back.
选择列表框值时，它会在客户端更改。但是您使用服务器端代码来获取值，'
In the user control if you set AutoPostBack="True" for the ListBox, you will get desired result.
在用户控件中，如果为ListBox设置AutoPostBack =“True”，您将获得所需的结果。
#1
1
When you select a listbox value, it changes in client side. But you are using serverside code to get the value, '<% Response.Write(fileBrowser.SelectedPath);%>' which is still 'empty' (initial value), untill the page is posted back.
选择列表框值时，它会在客户端更改。但是您使用服务器端代码来获取值，'
In the user control if you set AutoPostBack="True" for the ListBox, you will get desired result.
在用户控件中，如果为ListBox设置AutoPostBack =“True”，您将获得所需的结果。