Validate Image Url with variable value in JavaScript

Hi nauna,

Refer below code.

HTML

<div>
    <asp:Image ID="imgcoverimage" runat="server" />
    <asp:Button Text="Validate" runat="server" ImageUrl="~/images/noimage.png" OnClientClick="return ValidateUrl()" />
</div>
<script type="text/javascript">
    function ValidateUrl() {
        var url = "~/images/noimage.png";
        var imgUrl = "~/" + document.getElementById('imgcoverimage').attributes['src'].value;
        if (url == imgUrl) {
            alert('Please upload image');
            return false;
        } else {
            return true;
        }
    }
</script>