How to postback server by JavaScript Asp.net

Question

namespace KetBanBonPhuong.Controls.Default
{
     public partial class SugFriends : System.Web.UI.UserControl
    {
        private string Uid;

        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.Cookies["UId"] != null)
        {
            string value = Request.Cookies["UId"].Value;
            Uid = UserService.GetId_Cookie(value);
        }
        else
        {
            Uid = Session["Id"].ToString();
        }
        LoadListSuggest();
    }

    private void LoadListSuggest()
    {
        string str = "";
        List<RankByUser> list = new List<RankByUser>();
        list = RankByUserService.GetListRank(Uid);
        foreach (RankByUser rank in list)
        {
            str += "<li><div class=\"sug_acc\">"
                + "<a href=\"/" + rank.Link + ".aspx\"><img src=\"" + rank.Avatar + "\" alt=\"avatar\"/></a>"
                + "<a href=\"/" + rank.Link + ".aspx\" class=\"sug_name\">" + rank.LastName + " " + rank.FirstName + "</a>"
                + "</div>"
                + "<div class=\"rank\">"
                + "<a href=\"#\" title=\"Xem chi tiết\" class=\"num\">rank: " + rank.Rank + "</a>"
                + "<a href=\"#\" class=\"button mycoblue\">Kết bạn</a>"
                + "</div></li>";
        }
            ltrListSug.Text = str;
        }
    }
}`

It's a user control SugFriends.ascx being add in Default.Master

When I click "a.button" postback event to server?(I want to insert data to database, I used Sql server)

How to do it? Make tag a event onclick 'like' LinkButton: Onclick()?

Thanks for your helping! I found solution that problem! I used Ajax onclick for each tag a, event post Ajax.aspx, in here I can code work with database!

Don't do that. Instead, use server-side controls with a Repeater. — SLaks, Oct 18 '12 at 14:56
@SLaks The XSS vulnerability. How is this method vulnerable? — danyim, Oct 18 '12 at 15:16
@SLaks I want to user for each tag a, if not via Javascript, how to other way Can I user? — Thanh Le, Oct 18 '12 at 15:18

score 2 · Accepted Answer · edited May 23 '17 at 10:27

2

Add an onclick="(javascript:__doPostBack('','');" attribute to the <a> tag to perform a postback via Javascript. Like this:

            + "<a href=\"#\" class=\"button mycoblue\" onclick=\"(javascript:__doPostBack('','');\">Kết bạn</a>"

More details here

Response to comment:

Try creating a button on the page <asp:Button ID="btnPlaceHolder" Visible="False" runat="server" /> and then do what I said in this solution but instead use __doPostBack('<%=btnPlaceHolder.UniqueID %>', '')

From there, you can use the method block Private Sub btnPlaceHolder_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPlaceHolder.Click to run the code you want on postback.

edited May 23 '17 at 10:27

Community

1
1

answered Oct 18 '12 at 14:58

danyim

1,274
10
27

About code C#, Where I can write for onclick() like LinkButton protected void btn_Click(object sender, EventArgs e) {code here} – Thanh Le Oct 18 '12 at 15:06
Updated my solution to answer your comment. – danyim Oct 18 '12 at 15:23
Problem is I have many buttons like that(tag a in foreach loop), I can't great all by handle. – Thanh Le Oct 18 '12 at 15:29

How to postback server by JavaScript Asp.net

1 Answers1