如何为下拉列表添加工具提示? [英] How to add tooltip for dropdown list??

问题描述

如何为下拉列表添加工具提示...其中包含来自后端的数据....


这是我正在使用的代码

Hi,

how to add ToolTip for drop down list... which contain data from backend....


this is the code i am using

private void AttachTooltipForDropdowns(DropDownList ddlTarget)
{
    for (int i = 0; i < ddlTarget.Items.Count; i++)
    {
        ddlTarget.Items[i].Attributes.Add("title", ddlTarget.Items[i].Text);
    }
}
<br />
protected void Page_Prerender(object sender, EventArgs e)
{
    AttachTooltipForDropdowns(ddlf1);
    AttachTooltipForDropdowns(ddlf2);
}

ddlf1，ddlf2是ddl的ID，但不起作用.

有价值的建议和解决方案... plz

ddlf1,ddlf2 are the ID ''s of the ddl, but it is not working.

valuable suggestion and solutions... plz

推荐答案

您可能想尝试更改方法的参数列表:

You might want to try changijng your method''s parameter list:

private void AttachTooltipForDropdowns(ref DropDownList ddlTarget)
{
    for (int i = 0; i < ddlTarget.Items.Count; i++)    
    {
        ddlTarget.Items[i].Attributes.Add("title", ddlTarget.Items[i].Text);    
    }
}

protected void Page_Prerender(object sender, EventArgs e)
{
    AttachTooltipForDropdowns(ref ddlf1);
    AttachTooltipForDropdowns(ref ddlf2);
}

尝试在dropdownlist的pre_render事件中调用方法"AttachTooltipForDropdowns".它对我有用.

Try to call the method "AttachTooltipForDropdowns" in pre_render event of dropdownlist. It worked for me.

protected void Page_InitComplete(object sender, EventArgs e)
{
drp.PreRender += new EventHandler(DropDown_PreRender);
}

 public void DropDown_PreRender(object sender, EventArgs e)
        {
            DropDownList ddl = sender as DropDownList;
            if (ddl != null)
            {
                foreach (ListItem li in ddl.Items)
                {
                    // setting text value of item as tooltip
                    li.Attributes.Add("title", li.Text);
                }
            }
        }
  {

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