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February 2, 2016 14:47
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JavaScript Callback Example
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Example of using callbacks in JavaScript</title> | |
| <meta charset="utf-8" /> | |
| <style type="text/css"></style> | |
| </head> | |
| <body> | |
| <header> | |
| <h1>Simulation of delayed callback functionality</h1> | |
| </header> | |
| <article> | |
| <h1>Test Area</h1> | |
| <p id="pub">Waiting for response…</p> | |
| </article> | |
| </body> | |
| <script> | |
| var pub = document.getElementById("pub"); | |
| function caller(data, callback) { | |
| // run function | |
| callback(data + " has finally arrived"); | |
| } | |
| function delayedFunc(input) { | |
| // simulate delay in the function that is called back | |
| setTimeout(function () { | |
| pub.innerHTML = (input); | |
| }, 1500); | |
| } | |
| // test run: | |
| caller("The delayed data", delayedFunc); | |
| /* | |
| * Callbacks are often used when data retrieval is expected to be delayed. | |
| * Here is a simulation of a funciton with such a delay, and how a callback can solve the delayed execution of if. | |
| */ | |
| </script> | |
| </html> |
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