js method to control drop-down menu refresh_javascript skills

Idea: The master page hidden control receives the value from the content page and JS controls the reality of the menu item according to the accepted value
Master page:
Hidden control:

Copy the code The code is as follows:

JS:
<%-- Set selected--%>

Content Assign a value to the hidden space of the master page:
//Set the value of the master page Label to control the menu item CSS
The code is as follows:

Label X = (Label)this.Master.FindControl("Lbl_X"); X.Text = "A"; Label Xn = ( Label)this.Master.FindControl("Lbl_Xn");      Xn.Text = "A1";