级联下拉父ID [英] Cascading dropdown parent ID

问题描述

我在项目1中使用4下拉菜单1)制作2)模型3)传输4)燃料.为此，我使用级联下拉菜单.问题是我想根据"make"获取"transmission"，并且模型"表示我想将制造"和模型"设置为传输"的父ID.请为我建议合适的解决方案?

I am using 4 dropdown in my project 1)make 2)model 3)Transmission 4)fuel.I am using cascading dropdown for this.The problem is I want to get the "transmission" according to the "make" and the "Model" means I want to set "make" and "model" as parent id for "transmission". Please suggest me a suitable solution?

推荐答案

您可以按照以下步骤操作:

you can do as follow:

page_load()
{
 if(!ispostback)
{
 binddropdown1();   
}
}
dropdown1_selectedchange()
{
  binddropdown2();   
}
dropdown2_selectedchange()
{
  binddropdown3();
}
dropdown3_selectedchange()
{
  binddropdown4();
}

binddropdown1()
{
dropdown2, dropdown3, dropdown4.clear();
dropdown1.datasource = dt;
dropdown1.textfield = ""
dropdown1.datafield = "";
dropdown1.selectedindex = 0;
}   
binddropdown2()
{
dropdown3, dropdown4.clear();
dropdown2.datasource = dt; where fieldid = dropdown1.selectedvalue;
dropdown2.textfield = ""
dropdown2.datafield = "";
}
binddropdown3()
{
dropdown4.clear();
dropdown3.datasource = dt; where fieldid = dropdown2.selectedvalue;
dropdown3.textfield = ""
dropdown3.datafield = "";
}   
binddropdown4()
{
dropdown4.datasource = dt; where fieldid = dropdown3.selectedvalue;
dropdown4.textfield = ""
dropdown4.datafield = "";
}   

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