CODEWITHSUNDEEP
c#asp.net
AlwaysANovice
AlwaysANovice

Reputation: 993

How to use the onClick event for Hyperlink using C# code?

I am trying to add a condition for a hyperlink that I have in my page.

Instead of just using a particular link like: <a href="help/Tutorial.html">Tutorial</a> I want to display different pages for different users. For example, if the user is logged in as Admin, they will be presented with different link than regular users.

I have modified my hyperlink as: <a onclick="displayTutorial_Click">Tutorial</a>

and added this code:

    protected void displayTutorial_Click(object sender, EventArgs e)
    {
        // figure out user information
        userinfo = (UserInfo)Session["UserInfo"];

        if (userinfo.user == "Admin")

            System.Diagnostics.Process.Start("help/AdminTutorial.html");

        else

            System.Diagnostics.Process.Start("help/UserTutorial.html");            
    }

But this didn't work. Can anyone please help me to figure out how I can make the Tutorial link work properly? Thank you a lot in advance!!!

Upvotes: 5

Views: 121908

Answers (3)

Grrbrr404
Grrbrr404

Reputation: 1805

Wow, you have a huge misunderstanding how asp.net works.

This line of code

System.Diagnostics.Process.Start("help/AdminTutorial.html");

Will not redirect a admin user to a new site, but start a new process on the server (usually a browser, IE) and load the site. That is for sure not what you want.

A very easy solution would be to change the href attribute of the link in you page_load method.

Your aspx code:

<a href="#" runat="server" id="myLink">Tutorial</a>

Your codebehind / cs code of page_load:

...
if (userinfo.user == "Admin")
{
  myLink.Attributes["href"] = "help/AdminTutorial.html";
}
else 
{
  myLink.Attributes["href"] = "help/otherSite.html";
}
...

Don't forget to check the Admin rights again on "AdminTutorial.html" to "prevent" hacking.

Upvotes: 5

Jeremy Wiggins
Jeremy Wiggins

Reputation: 7299

The onclick attribute on your anchor tag is going to call a client-side function. (This is what you would use if you wanted to call a javascript function when the link is clicked.)

What you want is a server-side control, like the LinkButton:

<asp:LinkButton ID="lnkTutorial" runat="server" Text="Tutorial" OnClick="displayTutorial_Click"/>

This has an OnClick attribute that will call the method in your code behind.

Looking further into your code, it looks like you're just trying to open a different tutorial based on access level of the user. You don't need an event handler for this at all. A far better approach would be to just set the end point of your LinkButton control in the code behind.

protected void Page_Load(object sender, EventArgs e)
{
    userinfo = (UserInfo)Session["UserInfo"];

    if (userinfo.user == "Admin")
    {
        lnkTutorial.PostBackUrl = "help/AdminTutorial.html";
    }
    else
    {
        lnkTutorial.PostBackUrl = "help/UserTutorial.html";
    }
}

Really, it would be best to check that you actually have a user first.

protected void Page_Load(object sender, EventArgs e)
{
    if (Session["UserInfo"] != null && ((UserInfo)Session["UserInfo"]).user == "Admin")
    {
        lnkTutorial.PostBackUrl = "help/AdminTutorial.html";
    }
    else
    {
        lnkTutorial.PostBackUrl = "help/UserTutorial.html";
    }
}

Upvotes: 16

prema
prema

Reputation: 427

this may help you.

In .cs page,

//Declare a string
   public string usertypeurl = "";
  //check who is the user
       //place your code to check who is the user
       //if it is admin
       usertypeurl = "help/AdminTutorial.html";
       //if it is other 
        usertypeurl = "help/UserTutorial.html";

In .aspx age pass this variabe

  <a href='<%=usertypeurl%>'>Tutorial</a>

Upvotes: 1

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