Created
March 14, 2012 23:50
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Demo of elementary JavaScript DOM manipulation and event handling
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| <?xml version="1.0" encoding="UTF-8"?> | |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> | |
| <html version="-//W3C//DTD XHTML 1.1//EN" | |
| xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" | |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xsi:schemaLocation="http://www.w3.org/1999/xhtml | |
| http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd"> | |
| <head> | |
| <style type="text/css"> | |
| #contentContainer { | |
| border-style: dotted; | |
| } | |
| #outputContainer { | |
| background-color: #ffff99; | |
| } | |
| .highlighted { | |
| background-color: #ffff00; | |
| } | |
| </style> | |
| <script type="text/javaScript"> | |
| function populateBases() { | |
| var selectedValue = document.getElementById("ContentPicker").value; | |
| var output; | |
| switch (selectedValue) { | |
| case "1": | |
| output = "adenine, guanine"; | |
| break; | |
| case "2": | |
| output = "cytosine, thymine, uracil"; | |
| break; | |
| default: | |
| output = "Please select a category of bases above." | |
| break; | |
| } | |
| document.getElementById("outputContainer").innerHTML = output; | |
| } | |
| function addRow() { | |
| var tableElement = getExpandableTableAndCreateIfNeeded(); | |
| var newRow = document.createElement('tr'); | |
| tableElement.appendChild(newRow); | |
| var rowCount = tableElement.children.length; | |
| var newCell = document.createElement('td'); | |
| newCell.innerHTML = "A row (number " + rowCount + ") - click to toggle highlight"; | |
| newRow.appendChild(newCell); | |
| var toggleRowSelection = function() { | |
| if (this.className == "" || this.className == null) { | |
| this.className = "highlighted"; | |
| } | |
| else { | |
| this.className = null; | |
| } | |
| }; | |
| newCell.addEventListener("click", toggleRowSelection); | |
| } | |
| function getExpandableTableAndCreateIfNeeded() { | |
| var table = document.getElementById("expandableTable"); | |
| if (table == null) { | |
| table = document.createElement('table'); | |
| table.id = "expandableTable"; | |
| document.getElementById("tableContainer").appendChild(table); | |
| } | |
| return table; | |
| } | |
| </script> | |
| <title>JavaScript Test</title> | |
| </head> | |
| <body onload="populateBases()"> | |
| <h1>Dynamic Bases</h1> | |
| <div id="contentContainer"> | |
| <select id="ContentPicker" name="ContentPicker" onchange="populateBases()"> | |
| <option value="0">select a nitrogenous base</option> | |
| <option value="1">purines</option> | |
| <option value="2">pyrimidines</option> | |
| </select> | |
| <div id="outputContainer"> | |
| Please enable JavaScript. | |
| </div> | |
| <div id="buttonContainer" style="padding-top: 2em;"> | |
| <input type="button" value="Add some content" onclick="addRow()" /> | |
| </div> | |
| <div id="tableContainer"> | |
| </div> | |
| </div> | |
| </body> | |
| </html> |
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