如何在代码隐藏的下拉列表上调用BalloonPopupExtender上的SelectedIndexChanged事件 [英] How to call BalloonPopupExtender on dropdown SelectedIndexChanged event on code behind

问题描述

大家好，
 
如何在下拉列表上调用BalloonPopupExtender在
 
i后面的代码上的SelectedIndexChanged事件有一个示例代码请看看那个，
 
 
 <   asp：DropDownList     runat   =  server    ID   =  ddlPollutant   宽度  =  130px    AutoPostBack   =  true    OnSelectedI ndexChanged   =  ddlPollutant_SelectedIndexChanged >  
 
 <   asp：ListItem    文字  =   -  - 选择 -    值  =    -  1   已选择  =  True >  <   / asp：ListItem  >  
 <   asp：ListIte m    文字  =  H2S   值  =  34.08 >  <   / asp：ListItem  >  
 <   asp：ListItem    文本  =  SO2   值  =  64.0628 >  <   / asp：ListItem  >  
 <   asp：ListItem    文本  =  HCl   值  =  36.461 >  <   / asp：ListItem  >  
 <   asp：ListItem    文本  =  NH3   值  =   17.0306 >  <   / asp：ListItem  >  
  <   asp：ListItem     Text   =  HCN   值  =  27.0253 >  <   / asp：ListItem  >  
 <   / asp：DropDownList  < span class =code-keyword>>  
 
 <   asp：Panel     runat   =  server    ID   =  Panel1   样式  =  display：none >  
 <   table     cellpadding   =  0    cellspacing   =  0    border   =  0 >  
 <   tr  >  
 <   td     nowrap   =  nowrap >  
低pH下的NaOH 
 <   / td  >  
 <   / tr  >  
  <   tr  >  
 <   td     nowrap   =  nowrap >  
高pH下的NaOH 
 <   / td  >  
 <   / tr  >  
 <   / table  >  
 <   / asp：Panel  >  
 
 protected void ddlPollutant_SelectedIndexChanged（object sender，EventArgs e）
 {
 if（ddlPollutant） .SelectedItem.Text ==H2S）
 {
 BalloonPopupExtend er BPE = new BalloonPopupExtender（）; 
 BPE.TargetControlID = ddlPollutant.ID; 
 BPE.BalloonPopupControlID = Panel1.ID; 
 BPE.Position = BalloonPopupPosition.BottomRight; 
 BPE.BalloonStyle = BalloonPopupStyle.Rectangle; 
 BPE.BalloonSize = BalloonPopupSize.Medium; 
 BPE.UseShadow = true; 
 BPE.DisplayOnMouseOver = true; 
 BPE.DisplayOnClick = false; 
 BPE.DisplayOnFocus = false; 
 Panel1.Attributes.Add（style，display：block）; 
} 
 if（ddlPollutant.SelectedItem.Text ==SO2）
 {
 Panel1.Attributes.Add（style，display：none）; 
} 
 if（ddlPollutant.SelectedItem.Text ==HCl）
 {
 Panel1.Attributes.Add（style，display：none）; 
} 
 if（ddlPollutant.SelectedItem.Text ==NH3）
 {
 Panel1.Attributes.Add（style，display：none）; 
} 
 if（ddlPollutant.SelectedItem.Text ==HCN）
 {
 Panel1.Attributes.Add（style，display：none）; 
} 
} 
 
但它不适合我。 
 
请给出解决方案。

感谢ADvance，

VenkiDesai。

解决方案

我不知道BalloonPopupExtender，但我使用的是DropDownList.ToolTip，效果很好。

Hi All,

How to call BalloonPopupExtender on dropdown SelectedIndexChanged event on code behind

i have a sample code please have a look on that,


<asp:DropDownList runat="server" ID="ddlPollutant" Width="130px" AutoPostBack="true" OnSelectedIndexChanged="ddlPollutant_SelectedIndexChanged">

         <asp:ListItem Text="--Select--" Value="-1" Selected="True"></asp:ListItem>
         <asp:ListItem Text="H2S" Value="34.08"></asp:ListItem>
         <asp:ListItem Text="SO2" Value="64.0628"></asp:ListItem>
         <asp:ListItem Text="HCl" Value="36.461"></asp:ListItem>
         <asp:ListItem Text="NH3" Value="17.0306"></asp:ListItem>
         <asp:ListItem Text="HCN" Value="27.0253"></asp:ListItem>
         </asp:DropDownList>

<asp:Panel runat="server" ID="Panel1" Style="display: none">
    <table cellpadding="0" cellspacing="0" border="0">
    <tr>
      <td nowrap="nowrap">
      NaOH at low pH
      </td>
    </tr>
    <tr>
      <td nowrap="nowrap">
     NaOH at high pH
      </td>
    </tr>
    </table>
 </asp:Panel>

protected void ddlPollutant_SelectedIndexChanged(object sender, EventArgs e)
    {
    if (ddlPollutant.SelectedItem.Text == "H2S")
    {
    BalloonPopupExtender BPE = new BalloonPopupExtender();
    BPE.TargetControlID = ddlPollutant.ID;
    BPE.BalloonPopupControlID = Panel1.ID;
    BPE.Position = BalloonPopupPosition.BottomRight;
    BPE.BalloonStyle = BalloonPopupStyle.Rectangle;
    BPE.BalloonSize = BalloonPopupSize.Medium;
    BPE.UseShadow = true;
    BPE.DisplayOnMouseOver = true;
    BPE.DisplayOnClick = false;
    BPE.DisplayOnFocus = false;
    Panel1.Attributes.Add("style", "display:block");
    }
    if (ddlPollutant.SelectedItem.Text == "SO2")
    {
    Panel1.Attributes.Add("style", "display:none");
    }
    if (ddlPollutant.SelectedItem.Text == "HCl")
    {
    Panel1.Attributes.Add("style", "display:none");
    }
    if (ddlPollutant.SelectedItem.Text == "NH3")
    {
    Panel1.Attributes.Add("style", "display:none");
    }
    if (ddlPollutant.SelectedItem.Text == "HCN")
    {
   Panel1.Attributes.Add("style", "display:none");
    }
    }

But it was not working for me .

Please give solution to this.

Thanks in ADvance,
VenkiDesai.

解决方案

I don't know about the BalloonPopupExtender, but I use the DropDownList.ToolTip and that works great.

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