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lesson21.html
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lesson21.html
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<!DOCTYPE html>
<html>
<head>
<title>Beginner JavaScript</title>
</head>
<body>
<script src="allPages.js"></script>
<!-- HTML Mixed CodeMirror-->
<script src="codemirror-5.42.0/lib/codemirror.js"></script>
<link rel="stylesheet" href="codemirror-5.42.0/lib/codemirror.css">
<script src="codemirror-5.42.0/mode/htmlmixed/htmlmixed.js"></script>
<script src="codemirror-5.42.0/mode/xml/xml.js"></script>
<script src="codemirror-5.42.0/mode/javascript/javascript.js"></script>
<script src="codemirror-5.42.0/mode/css/css.js"></script>
<style>
h1 {
text-align:center;
}
html, body {
margin:0;
padding:0;
}
p {
margin:8px;
}
</style>
<p>You can also use CSS selectors to select elements through document.querySelector and document.querySelectorAll</p>
<p>Let's use document.querySelector to find and modify some HTML elements!</p>
<script>
window.answershown = false
function showanswer() {
if (window.answershown === true) {
document.querySelector("#example > .CodeMirror").remove()
window.answershown = false
document.getElementById("solutionbutton").innerHTML = "Show Solution"
}
else {
window.answershown = true
document.getElementById("solutionbutton").innerHTML = "Hide Solution"
document.getElementById("exampleeditor").value = window.solutionHTML
var example = CodeMirror.fromTextArea(document.getElementById("exampleeditor"), {
name: "htmlmixed",
autoCloseTags: true,
styleActiveLine: true,
lineWrapping: false,
lineNumbers:true,
tabSize:2,
readOnly:true,
cursorBlinkRate:-1 //Hides cursor
});
}
}
window.solutionHTML = "<!--<!DOCTYPE html>\n<html>\n <head>\n </head>\n <body>\n <p class=\"important\">This is the first paragraph</p>\n <p>This is the second paragraph</p>\n <p>This is the third paragraph</p>\n <p class=\"important\">This is the fourth paragraph</p>\n <p class=\"important\">This is the fifth paragraph</p>\n\n <style>\n #paragraph1 {\n \tfont-weight:bold;\n }\n </style>\n <script>\n \n //All of those paragraphs are the wrong color. Make them blue...\n var paragraphs = document.querySelectorAll(\"p\") //Get an array of all the paragraph elements\n \n //Now we need to go through and modify each element in the array. We can do this using a for loop\n\t\t\tfor (var i=0;i<paragraphs.length;i=i+1) {\n \tvar paragraph = paragraphs[i] //Get the paragraph at position i in the array\n paragraph.style.color = \"blue\" //Make the paragraph blue\n }\n \n \n //Now you try! Fill in the code to make all the elements \n //of the CSS class important bold!\n paragraphs = document.querySelectorAll(\".important\")\n for (var i=0;i<paragraphs.length;i++) {\n var paragraph = paragraphs[i]\n \tparagraph.style.fontWeight = \"bold\"\n }\n \n \n </script>\n </body>\n</html>-->";
window.solutionHTML = window.solutionHTML.slice(4)
window.solutionHTML = window.solutionHTML.slice(0, -3)
</script>
<div style="text-align:center;">
<button style="display:inline-block;margin:auto;padding:6px;background-color:aqua"onclick="showanswer()" id="solutionbutton">Show Solution</button>
<button style="display:inline-block;margin:auto;padding:6px;background-color:lightsalmon;"onclick="window.location = self.previousLesson">Go Back</button>
<button style="display:inline-block;margin:auto;padding:6px;background-color:lightgreen;"onclick="window.location = self.nextLesson">Continue</button>
</div>
<div id="example">
<textarea id="exampleeditor" hidden="true"></textarea>
</div>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
<script>
//HTML that is in editor at start
//.split("\n").join("\\n").split("\t").join("\\t").split("\"").join("\\\"")
window.initialHTML = "<!--<!DOCTYPE html>\n<html>\n <head>\n </head>\n <body>\n <p class=\"important\">This is the first paragraph</p>\n <p>This is the second paragraph</p>\n <p>This is the third paragraph</p>\n <p class=\"important\">This is the fourth paragraph</p>\n <p class=\"important\">This is the fifth paragraph</p>\n\n <style>\n #paragraph1 {\n \tfont-weight:bold;\n }\n </style>\n <script>\n \n //All of those paragraphs are the wrong color. Make them blue...\n var paragraphs = document.querySelectorAll(\"p\") //Get an array of all the paragraph elements\n \n //Now we need to go through and modify each element in the array. We can do this using a for loop\n\t\t\tfor (var i=0;i<paragraphs.length;i=i+1) {\n \tvar paragraph = paragraphs[i] //Get the paragraph at position i in the array\n paragraph.style.color = \"blue\" //Make the paragraph blue\n }\n \n \n //Now you try! Fill in the code to make all the elements \n //of the CSS class important bold!\n paragraphs = document.querySelectorAll(\".important\")\n //Uncomment and fill in the for loop. You may want to look at the code above\n //for () {\n //Make sure to define the variable named paragraph!\n \t//paragraph.style.fontWeight = \"bold\"\n //}\n \n \n </script>\n </body>\n</html>-->";
window.initialHTML = window.initialHTML.slice(4)
window.initialHTML = window.initialHTML.slice(0, -3)
</script>
<!-- All the stuff below is CodeMirror-->
<!-- window.initialHTML is the HTML that they should begin with-->
<div id="editorwrapper">
<textarea id="editor"></textarea>
<button id="run">Run!</button>
<button id="download">Download!</button>
<button id="reset">Reset</button>
</div>
<iframe id="result" src="javascript:document.write('Click run - the HTML page will display here')"></iframe>
<script>
function download(content, name, mimetype) {
var link = document.createElement("a");
document.body.appendChild(link);
content = new Blob([content], {type:mimetype})
link.download = name
link.href = URL.createObjectURL(content);
link.click();
document.body.removeChild(link);
}
document.getElementById("editor").value = localStorage.getItem(window.location.href + "htmlcode") || window.initialHTML
var previoustext;
function save() {
var currentValue = editor.getValue()
if (editor.getValue() !== previoustext) {
previoustext = currentValue
localStorage.setItem(window.location.href + "htmlcode", currentValue)
}
if (currentValue === window.initialHTML) {
document.getElementById("reset").style.opacity = "0.4"
document.getElementById("reset").style.cursor = "not-allowed"
}
else {
document.getElementById("reset").style.opacity = "1"
document.getElementById("reset").style.cursor = "default"
}
}
setInterval(save, 100)
function resetCode() {
editor.setValue(window.initialHTML)
}
document.getElementById("reset").addEventListener("click", resetCode)
var editor = CodeMirror.fromTextArea(document.getElementById("editor"), {
name: "htmlmixed",
autoCloseTags: true,
styleActiveLine: true,
lineWrapping: false,
lineNumbers:true,
tabSize:2
});
function runcode() {
var htmlcode = editor.getValue()
var iframe = document.getElementById("result")
iframe.contentWindow.document.open();
iframe.contentWindow.document.write(htmlcode);
iframe.contentWindow.document.close();
}
document.getElementById("run").addEventListener("click", runcode)
document.getElementById("download").addEventListener("click", function(){
download(editor.getValue(), "website.html", "text/html")
})
setTimeout(function() {
editor.refresh() //Make sure the editor displays all the content, not just some of it.
},1)
</script>
<style>
#editorwrapper {
left:0;
height:50%;
width:60%;
display:inline-block;
float:left;
border-right:1px solid black;
border-top:1px solid black;
position:fixed;
bottom:0;
padding:0;
}
#result {
right:0;
height:50%;
width:40%;
border:0;
border-top:1px solid black;
border-left:1px solid black;
display:inline-block;
float:right;
position:fixed;
bottom:0;
padding:0;
background-color:white;
z-index:4;
}
/*Make the bottom editor display over the solution*/
#editorwrapper {
background-color:white;
opacity: 1;
z-index: 4;
}
.CodeMirror {
width:100%;
height:93%;
}
#run {
width:45%;
height:7%;
font-size:16px;
background-color:#99e0ff;
border:0;
display:inline-block;
float:left;
}
#download {
width:30%;
height:7%;
font-size:16px;
background-color:#99ffe0;
border:0;
display:inline-block;
}
#reset {
width:25%;
height:7%;
font-size:16px;
background-color:salmon;
border:0;
display:inline-block;
float:right;
}
html, body {
width:100%;
height:100%;
}
</style>
</body>
</html>