Asp.net Value Passing to Javascript

Question

I have worked about Google Maps Javascript API I have an issue.

In my js code

        var RX1 = [];
        var RY1 = [];
        var RX2 = [];
        var RY2 = [];
        var i;
        try
        {
            for (i = 0; i < RRCount; i++)
            {
                RX1[i] = <%=ListBoxRX1.Items[i] %>;
                RY1[i] = <%=ListBoxRY1.Items[i] %>;
                RX2[i] = <%=ListBoxRX2.Items[i] %>;
                RY2[i] = <%=ListBoxRY2.Items[i] %>;
            }
        }
        catch (e)
        {
            alert("MSSQL 403 Hatası !! Forbidden.");
        }

in this code ListBoxRX1.Items[i] i variable error is "The name 'i' does not exist in the current context"

I did everything but I didn't have found. Please help! Thanks a lot.

The problem is, that the javascript code is executed on the client, whereas your ListBox code is executed on server side. That means, that at the point of accessing the ListBox items (on the server) i is not defined. — Paul
– Paul, Commented Mar 26, 2018 at 21:07
You might take a look at this post: stackoverflow.com/a/3465192/9487478 — Paul
– Paul, Commented Mar 26, 2018 at 21:13

Paul Pearce · Accepted Answer · 2018-03-27 14:59:20Z

0

The issue is that "i" and the for loop are declared in the JavaScript, not in ASP.NET, and as a result they are not accessible to the code running on the server and the loop does not execute on the server. You will need to have your loop run on the server, using something like this (assuming RRCount is a server side variable):

    var RX1 = [];
    var RY1 = [];
    var RX2 = [];
    var RY2 = [];
    var i;
    try
    {
        <% 
        for (int i = 0; i < RRCount; i++) 
        { 
        %>
            <%="RX1[" + i + "] = '" + ListBoxRX1.Items[i] + '";" %>
            <%="RY1[" + i + "] = '" + ListBoxRY1.Items[i] + '";" %>
            <%="RX2[" + i + "] = '" + ListBoxRX2.Items[i] + '";" %>
            <%="RY2[" + i + "] = '" + ListBoxRY2.Items[i] + '";" %>
        <% 
        }  
        %>
    }
    catch (e)
    {
        alert("MSSQL 403 Hatası !! Forbidden.");
    }

edited Mar 27, 2018 at 14:59

answered Mar 26, 2018 at 21:13

Paul Pearce

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4 Comments

Serkan Kaya Over a year ago

I tried this thanks but it didn't work. Variables still get same error.

Paul Over a year ago

That's because "i" is still not declared. Use for (int i = 0; i < RRCount; i++).

Serkan Kaya Over a year ago

Thanks for your advice Paul Pearce. I have fixed that from other Paul brother :))

Paul Pearce Over a year ago

Hi @SerkanKaya if this answer has solved your question please consider accepting it by clicking the check-mark. This indicates to the wider community that you've found a solution and gives some reputation to both the answerer and yourself. There is no obligation to do this. Thanks!

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