使用asp.net vb代码链接两个下拉列表 [英] linking two dropdown list using asp.net vb code

问题描述

大家好，

请在asp.net vb代码中为我提供用于链接两个下拉菜单的代码

问候
Ananth

hello all,

Please provide me code in asp.net vb code for linking two dropdowns

Regards
Ananth

推荐答案

请按照以下步骤操作.

1.创建函数以获取第一个下拉列表的数据.
2.将下拉列表的datatext和datavalue属性设置为数据库表列. 3.分配数据源并调用第一个下拉列表的databind属性.
4.在选定的索引更改事件上，使用where条件从第一个下拉列表中获取选定的值/文本，并从第二个下拉列表中获取数据.
5.按照步骤2和3进行第二次下拉.

Please Follow Following Steps.

1. Create Function to get Data For First Dropdown.
2. set datatext and datavalue property of dropdown to database table columns.
3. Assign Datasource and call databind property of first dropdown.
4. on selected index change event, get selected value/text from first dropdown and get data for second dropdown using where condition.
5. follow step 2 and 3 for second dropdown.

嗨...

试试这个...


受保护的void Page_Load(对象发送者，EventArgs e)
{
DataTable dt = new DataTable();
dt = objDA.GetList();
DropDownList1.DataSource = dt;
DropDownList1.DataBind();

}

受保护的void DropDownList1_SelectedIndexChanged(对象发送者，EventArgs e)
{
如果(DropDownList1.SelectedIndex& gt; 0)
{

DataTable dt = new DataTable();
dt = objDA.GetList(DropDownList1.SelectedValue);
DropDownList1.DataSource = dt;
DropDownList1.DataBind();
}
}

Hi...

Try this...


protected void Page_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt = objDA.GetList();
DropDownList1.DataSource = dt;
DropDownList1.DataBind();

}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (DropDownList1.SelectedIndex > 0)
{

DataTable dt = new DataTable();
dt = objDA.GetList(DropDownList1.SelectedValue);
DropDownList1.DataSource = dt;
DropDownList1.DataBind();
}
}

只是Google或使用CP搜索来搜索"级联下拉列表"

尝试，使用/实现它.如果您在实施它时遇到问题，那么请与您共同解决问题.

Just Google or use CP Search for "Cascading dropdown"

Try, use/implement it. If you face issues while implementing it then do share across your effort with issues.

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