JavaScript: Dynamic Content

by MythOfEchelon

HTML

<!DOCTYPE html> <!-- This is just my HTML5-valid template. Make sure you set this up correctly for your personal needs -->

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title></title>
        
        <style>
            * {
                margin: 0;
                padding: 0;
            }
        
            html {
                font: 16px "Segoe UI", "Segoe WPC", Helvetica, Arial, "Arial Unicode MS", Sans-Serif;
            }
            
            div {
                float: left;
            }
            
            #y {
                padding: 25px 50px 25px 50px;
                background-color: red;
                color: white;
                display: none;
            }
        </style>
    </head>
    
    <body id="x">
        <div id="page_Wrapper">
            <div id="y"><span>Y Element</span></div>
        </div>
        
        <!-- Include the script after all DOM elements have been created, to avoid any potential DOM-related errors -->
        <script>
            window.onLoad = checkBodyID();
            
            function checkBodyID(){
                var body_ID = document.getElementsByTagName("body")[0].id;
                var y_Element = document.getElementById("y");

                if (body_ID == "x"){
                   y_Element.style.display = "block";
                } else {
                    return false;
                }
            }
        </script>
    </body>
</html>