Web_dev_learn/class14.html at main · Allwina/Web_dev_learn · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #mydiv{
            width:200px;
            height: 200px;
            border-radius: 20px;
            background-color: blueviolet;
        }
    </style>
</head>
<body>
    <div align="center">

        <h2 class="data">Check details</h2>
        <h3>Visit again</h3>
        <!-- Dom Event:action that takes place  as a result of change in the dom tree  -->
        <h1 id="greet">Hello</h1>
        <button ondbclick="id1()">Click Here</button><br><br>
        <div id="mydiv"><br>
            <button onclick="bg()">Change background</button>
        </div>
    </div>
    <script>
        // innerHTML:helps change modify html
        //use index number for priority

        document.getElementsByClassName("data")[0].innerHTML="Verify the data"
        document.getElementsByTagName("h3")[0].innerHTML="Thank You"
     function id1()
     {
        document.getElementById("greet").innerHTML="This is modified by DOM selectors "
     }
    //  generating bg color
    //bg generator
     function bg()
     {
        var r=Math.floor(Math.random()*255)
        var g=Math.floor(Math.random()*255)
        var b=Math.floor(Math.random()*255)
        var change="rgb("+r+","+g+","+b+")"
        console.log(change)

        document.querySelector("#mydiv").style.background=change;
        document.body.style.background=change
     }
   </script>
   <!-- Node.js: is based on scripting language.
    Open source server side environment.learn js free of cost.
    platform independent
    ASP.net-->
</body>
</html>