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Set jQuery text value is lost after postback

<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script src="../js/jquery/jquery-1.4.1.min.js" type="text/javascript"></script> <script> function btnSetText_OnClientClick() { $("#<%= lbl1.ClientID %>").text("123"); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="lbl1" runat="server"></asp:Label> <asp:Button ID="btnSetText" runat="server" Text="Set Text" OnClientClick="btnSetText_OnClientClick(); return false;" /> <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" /> </div> </form> </body> </html> protected void Page_Load(object sender, EventArgs e) { } protected void btnSubmit_Click(object sender, EventArgs e) { string str1 = lbl1.Text; }

The script is here, when the user clicks “set text”, the jquery script will update the label value, when the “Submit” button is pressed, the value of lbl1.Text is always “”, which is lost after the postback, any ideas?

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2 answers

Use A HiddenField Get value after postback

try it

 <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script src="../js/jquery/jquery-1.4.1.min.js" type="text/javascript"></script> <script> function btnSetText_OnClientClick() { $("#<%= lbl1.ClientID %>").text("123"); $('#HiddenFileldVariable').val($("#<%= lbl1.ClientID %>").text()); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="lbl1" runat="server"></asp:Label> <asp:Button ID="btnSetText" runat="server" Text="Set Text" OnClientClick="btnSetText_OnClientClick(); return false;" /> <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" /> <asp:HiddenField ID="HiddenFileldVariable" runat="server" /> </div> </form> </body> </html> protected void Page_Load(object sender, EventArgs e) { } protected void btnSubmit_Click(object sender, EventArgs e) { string str1 = HiddenFileldVariable.Value; }
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I think the problem may be related to the EnableViewState property for your asp.net button; It must be true in order for the value to be passed to the postback handler.

I checked a little on my side, and I can reproduce your problem if EnableViewState is "false"; It works if I set it to true.

Hope this helps,

Roger

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Source: https://habr.com/ru/post/1488261/

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