[英]Unable to catch the Dropdown selected value in a textbox inside a repeater
I have a DropDownList
inside a repeater and whenever the selected text is changed, I have to show it in a TextBox
but I'm getting Object reference not set to an instance of an object
error 我在中继器中有一个
DropDownList
并且每当更改选定的文本时,都必须在TextBox
显示它,但是我得到的Object reference not set to an instance of an object
错误Object reference not set to an instance of an object
protected void Ddl_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl = (DropDownList) sender;
RepeaterItem item = (RepeaterItem) ddl .NamingContainer;
TextBox txt = (TextBox) item.FindControl("TextBox4");
txt.Text = ddl.SelectedItem.Text;
}
Just enable Ddl dropdowns autopost back property to true and just add following line of code: 只需将Ddl下拉列表的autopost back属性设置为true,然后添加以下代码即可:
protected virtual void RepeaterItemCreated(object sender, RepeaterItemEventArgs e)
{
DropDownList MyList = (DropDownList)e.Item.FindControl("ddl");
MyList.SelectedIndexChanged += ddl_SelectedIndexChanged;
}
protected void Ddl_SelectedIndexChanged(object sender, EventArgs e)
{
RepeaterItem item = (RepeaterItem) Page.FindControl("repeatorid");
TextBox txt = (TextBox) item.FindControl("TextBox4");
txt.Text = ddl.SelectedItem.Text;
}
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