Passing arrays from Javascript to asp.net

Question

I have two separate pages. One with a HTML page involving JavaScript (bunch of functions etc.) and an .aspx page.

I have some array in html page and I want to send them(using JavaScript) to .aspx to store them into a database.

I have tried hidden field, creating a form etc. All I get is null. How can I pass my arrays to aspx to store them in database later? I can't use jQuery.

function openPopup() {
        window.open("Default.aspx",  "scrollbars=yes, width=900,height=500,left=430,top=100");
        return false;
    }
function control() {
        var a = JSON.stringify(x);// x and y are my arrays
        var b = JSON.stringify(y);

        var btnId = '<%= HiddenField1.ClientID%>';
        var btnId2 = '<%= HiddenField2.ClientID%>';
        document.getElementById(btnId).value = a;
        document.getElementById(btnId2).value = b;                       
    }

IN HTML

<button onclick="openPopup()">POP</button> //opens the aspx page

IN ASPX

<form id="form1" runat="server">
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Database" />
    <asp:HiddenField ID="HiddenField1" runat="server" />
    <asp:HiddenField ID="HiddenField2" runat="server" />
</form>

IN ASPX.CS

protected void Button1_Click(object sender, EventArgs e)
{
    Response.Write(HiddenField1);
}

Is it literally all content on aspx? Or is there masterpage, or more stuff on the aspx? — Andrei
– Andrei, Commented Dec 21, 2016 at 14:34
stackoverflow.com/questions/5088450/… - maybe this might help? — NoobishPro
– NoobishPro, Commented Dec 21, 2016 at 14:36
Please do not refer to JavaScript as JScript. That has a different but related meaning that is just going to lead to confusion. — mason
– mason, Commented Dec 21, 2016 at 14:43
you are confusing client side and server side. They dont mix but can comunicate through ajax, rest api,post/get request — giammin
– giammin, Commented Dec 21, 2016 at 14:53

danwellman · Accepted Answer · 2016-12-21 14:35:27Z

1

You will need to send the data to the server using AJAX (preferably) or using a traditional form submission (page will be reloaded after submission).

The server cannot access the HTML elements once the page has been rendered in the browser.

answered Dec 21, 2016 at 14:35

danwellman

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