Way to get value of Label

As I said before,...

http://my-friend.co/Test_rec4/JavaScript1.js, Line 158

var site_lang = document.getElementById("<%= lb_site_lang.ClientID %>").innerHTML;

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1. there is no such element on the page - lb_site_lang
2. you cannot use <%= ... %> on a js file

here is the site for reference
http://my-friend.co/Test_rec4/Default.aspx?userid=mc23

Sorry, I did declare the Label on page. How to adjust this

var site_lang = document.getElementById("<%= lb_site_lang.ClientID %>").innerHTML;

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to refer to the Label

there is no such thing on the page, so you cannot get the value of it :)

where is the code for that element?

I have

    <asp:Label ID="lb_site_lang"
        Visible="false"
        Style="display: none"
        Font-Names="Times New Roman" 
        Font-Size="11pt" 
        Font-Bold="true"
        ForeColor="DarkBlue"
        ClientIDMode="Static"
        runat="server" />

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on page, and due to that it is not Visible, thus you do not see it on the page

Visible="false"

means DO NOT RENDER it!
it will not be on page, just use style...

also, why do you need label for this?
use hidden element

<asp:HiddenField ID="lb_site_lang" runat="server" value=""/>

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and set the value on your page as

lb_site_lang.value = "ENG"

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then you can use

var site_lang = document.getElementById("<%= lb_site_lang.ClientId %>").value;

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but the issue is, you cannot use "<%= lb_site_lang.ClientId %>" in external js files!

to fix that, we can use class

<asp:Label ID="lb_site_lang"
        cssClass="siteLanguage"
        ClientIDMode="Static"
        runat="server" />

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css

siteLanguage {
  display:none
}

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and js

var site_lang = document.getElementById("lb_site_lang %>").innerHTML;

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I have

    <asp:HiddenField ID="hf_site_lang" runat="server" value=""/>
    ...
        success: function (response) {
            var site_lang = document.getElementById("<%= hf_site_lang.ClientId %>").value;

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but I still cannot show the list, after re-deployment, due to current change.

Good day HainKurt,
If available, can you please see this below?

https://www.experts-exchange.com/questions/29045779/Adjust-the-area.html