链接到选项下拉菜单

Question

Can you link to a specific value in an options drop down box from another page?

In other words, let's say that I'm on page 1 and I want to anchor link to page 2 that has an options drop down box with 3 different values in it. Let's say by default when you go to page 2, the drop down option box is showing value 1.

Is it possible to link to page 2 and change the value of that option box on the fly? Whereas when you click the link on page 1 it will automatically show value 3 instead of 1 on page 2.

Answer 1

This is certainly possible. You can pass a flag in your querystring. So, on page1 you have a link to page2 like "page2.aspx?option=3". Then, in page2's PageLoad method, simply read that value from the querystring (Request.QueryString["option"]) and set the selected item of the DropDownList appropriately.

One page1 you would have...

<a href="page2.aspx?option=3">link to page 2</a>

In the codebehind of page2, based on Al's example...

void Page_Load(object sender, EventArgs e) {
   if (!Page.IsPostBack) {
      int option;
      if(int.TryParse(Request.QueryString["option"], out option) { //Only set the value if it is actually an integer
         ddlList.SelectedIndex = option;
      }
   }
}