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34 lines
964 B
HTML
34 lines
964 B
HTML
<!DOCTYPE html>
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<html>
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<body>
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<ul id="myList">
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<li>Coffee</li>
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<li>Tea</li>
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</ul>
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<p>Click the button to insert an item to the list.</p>
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<button onclick="myFunction()">Try it</button>
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<p><strong>Example explained:</strong><br>First create a LI node,<br> then create a Text node,<br> then append the Text node to the LI node.<br>Finally insert the LI node before the first child node in the list.</p>
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<script>
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function myFunction() {
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var newItem = document.createElement("LI");
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var textnode = document.createTextNode("Water");
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newItem.appendChild(textnode);
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var list = document.getElementById("myList");
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list.insertBefore(newItem, list.firstChild);
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var result = document.getElementsByTagName("UL")[0].outerHTML;
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console.assert(result === '<UL id="myList"><LI>Water</LI>\n <LI>Coffee</LI>\n <LI>Tea</LI>\n</UL>', 'Water, Coffee, Tea');
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}
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console.error('element.insertBefore.html');
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myFunction();
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console.exit(0);
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</script>
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</body>
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</html>
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