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| 1 | <!DOCTYPE html> | |
| 2 | <html> | |
| 3 | <head> | |
| 4 | <title></title> | |
| 5 | <script type="text/javascript"> | |
| 6 | function substitute() {
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| 7 | ||
| 8 | - | var value = document.getElementById('myTextBox').value;
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| 8 | + | var value = document.getElementById(myTextBox).value |
| 9 | ||
| 10 | if (value.length === 0) {
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| 11 | ||
| 12 | alert("Please enter a real value in the text box");
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| 13 | ||
| 14 | return; | |
| 15 | ||
| 16 | } | |
| 17 | ||
| 18 | var title = document.getElementById('title');
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| 19 | title.innerHTML = value; | |
| 20 | ||
| 21 | } | |
| 22 | ||
| 23 | ||
| 24 | </script> | |
| 25 | </head> | |
| 26 | <body> | |
| 27 | <h1 id="title">JavaScript Example</h1> | |
| 28 | <p> | |
| 29 | <input type="text" id="myTextBox" /> | |
| 30 | <input type="submit" value="Click me" onclick="substitute()" /> | |
| 31 | ||
| 32 | </p> | |
| 33 | </body> | |
| 34 | </html> |
