DropDown事件不会触发 [英] DropDown Event won't fire

问题描述

我有一个DropDownList，其功能是根据所选的分数改变颜色。以下是代码：

Hi,

I have a DropDownList who's function is to change its color depending on the scores selected. here are the codes:

<asp:DropDownList AutoPostBack="true" ID="rating1"  runat="server" Width="60px"

                      onselectedindexchanged="rating1_SelectedIndexChanged">
                      <asp:ListItem>NA</asp:ListItem>
                      <asp:ListItem>1</asp:ListItem>
                      <asp:ListItem>1.5</asp:ListItem>
                      <asp:ListItem>2</asp:ListItem>
                      <asp:ListItem>2.5</asp:ListItem>
                      <asp:ListItem>3</asp:ListItem>
                      <asp:ListItem>3.5</asp:ListItem>
                      <asp:ListItem>4</asp:ListItem>
                      <asp:ListItem>4.5</asp:ListItem>
                      <asp:ListItem>5</asp:ListItem>
                  </asp:DropDownList>

活动：

event:

protected void rating1_SelectedIndexChanged(object sender, EventArgs e)
  {
      float value = float.Parse(rating1.Text);
      if (value <= 3)
      {
          rating1.BackColor = System.Drawing.ColorTranslator.FromHtml("#FFFF66");
      }
      else
      {
          rating1.BackColor = System.Drawing.ColorTranslator.FromHtml("#FF3300");
      }
  }

从下拉列表中选择分数后，这个事件如何触发？

how can this event fire after selecting the scores from dropdown list??

推荐答案

在Google Chrome和IE中试用您的代码而不更改您发布的代码。两者似乎都有效。但在IE中，断点并没有出于某种原因。一旦我尝试为下拉列表添加EnableViewState为true，它就开始达到断点。您是否可以尝试相同。如果您仍然面临问题，请恢复。

Tried your Code in Google chrome and IE without any change in your posted code. Both seems to be working. But in IE , the Breakpoint was not hitting for some reason . Once I tried adding the EnableViewState to true for the dropdownlist , it started to hit the break point. Can you try the same .Please revert if your still facing the issue.

为什么不尝试rating1.SelectedItem.Value而不是rating1.Text

Why no you are trying rating1.SelectedItem.Value instead of rating1.Text

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