JavaScript - getElementById not finding control?
I am simply trying to store a label in a variable in javascript but for some reason this isn't working with `document.getElementById('control');`. I know my javascript is linking to my html file fine because everything else works.

Here is my javascript code:

    function performEvapCooledCircuit(txt)
    {
        var error = document.getElementById('lblError');
        
        
        if (txt.value == null || isNaN(txt.value))
        {
           error.style.visibility = "visible";
        }
    }

Here is the html code for my label:

    <asp:Label ID="lblError" class="NormLabel" runat="server" 
       style="color:red; visibility:hidden;" Text="Invalid Input."></asp:Label>

I am getting an error that says object expected??
JavaScript - getElementById not finding control?
===

I am simply trying to store a label in a variable in javascript but for some reason this isn't working with `document.getElementById('control');`. I know my javascript is linking to my html file fine because everything else works.

Here is my javascript code:

    function performEvapCooledCircuit(txt)
    {
        var error = document.getElementById('lblError');
        
        
        if (txt.value == null || isNaN(txt.value))
        {
           error.style.visibility = "visible";
        }
    }

Here is the html code for my label:

    <asp:Label ID="lblError" class="NormLabel" runat="server" 
       style="color:red; visibility:hidden;" Text="Invalid Input."></asp:Label>

I am getting an error that says object expected??