codeup-web-exercises/dom-query-js.html at master · michaelmeyer26/codeup-web-exercises · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>DOM: Query and Modify</title>
</head>
<body>

<button type="button" id="btn1">Set Main Header to "JavaScript is Cool"</button>
<button type="button" id="btn2">Set text of Sub Header to blue</button>
<button type="button" id="btn3">Set color of every other list item to grey</button>
<button type="button" id="btn4">Set color of first list item to blue</button>
<button type="button" id="btn5">Change text to "Mission Accomplished!"</button>


<h1 id="main-header">Hello World!</h1>
<ul>
    <li data-dbid="1">Item 1</li>
    <li data-dbid="2">Item 2</li>
    <li data-dbid="3">Item 3</li>
    <li data-dbid="4">Item 4</li>
    <li data-dbid="5">Item 5</li>
</ul>
<h2 id="sub-header">Hello Again.</h2>
<p class="sub-paragraph">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
    eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim
    ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
    aliquip ex ea commodo consequat. Duis aute irure dolor in
    reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
    culpa qui officia deserunt mollit anim id est laborum.
</p>

<script>
    (function() {
        "use strict";
        // TODO: Uncomment next line and get the main header element by id
        var mainHeader = document.getElementById("main-header");

        // TODO: Set inner html of mainHeader to "JavaScript is Cool"
        var changeMainHeader = function (event) {
            mainHeader.innerHTML = "Javascript is Cool";
        }

        // TODO: Uncomment the next line and get the sub header element by id
        var subHeader = document.getElementById("sub-header");

        // TODO: Set the text color of subHeader to blue
        var changeSubHeader = function(event) {
            subHeader.style["color"] = "#00c";
        }

        // TODO: Uncomment the next line and get all list items
        var listItems = document.getElementsByTagName("li");

        // TODO: Set text color on every other list item to grey
        var changeEveryOtherLI = function(event) {
            for (var i = 0; i < listItems.length; i++) {
                // var currentLI = listItems[i];
                if (i % 2 == 0) {
                    listItems[i].style.color = "gray";
                }
            }
        }

        // TODO: Set text color of li with dbid = 1 to blue
        var changeFirstLI = function (event) {
            for (var i = 0; i < listItems.length; i++) {
                if (listItems[i].getAttribute("data-dbid") === "1") {
                    listItems[i].style.color = "#00c"
                }
            }
        }

        // TODO: Uncomment the next line and get all elements with class name sub-paragraph
        var subParagraphs = document.getElementsByClassName("sub-paragraph");

        // TODO: Change the text in the first sub paragraph to "Mission Accomplished!"
        var changeSubParagraph = function (event) {
            subParagraphs[0].innerText = "Mission Accomplished!";
        }

        document.getElementById('btn1').addEventListener('click', changeMainHeader)
        document.getElementById('btn2').addEventListener('click', changeSubHeader)
        document.getElementById('btn3').addEventListener('click', changeEveryOtherLI)
        document.getElementById('btn4').addEventListener('click', changeFirstLI)
        document.getElementById('btn5').addEventListener('click', changeSubParagraph)
    })();
</script>
</body>
</html>