AWS SDK for JavaScript
Developer Guide for SDK version 2.119.0

Invoking a Lambda Function Code

Here is the complete HTML and browser script for the slot machine example.

<!doctype html> <html> <head> <meta charset="UTF-8"> <title>Emoji Slots</title> <link href="emojislots.css" rel="stylesheet" type="text/css"> <script src=""></script> <script src=""></script> <script type="text/javascript"> // Configure AWS SDK for JavaScript AWS.config.update({region: 'REGION'}); AWS.config.credentials = new AWS.CognitoIdentityCredentials({IdentityPoolId: 'IDENTITY_POOL_ID'}); var pullReturned = null; var slotResults; var isSpinning = false; // Prepare to call Lambda function var lambda = new AWS.Lambda({region: 'REGION', apiVersion: '2015-03-31'}); var pullParams = { FunctionName : 'slotPull', InvocationType : 'RequestResponse', LogType : 'None' }; function pullHandle() { if (isSpinning == false) { // Show the handle pulled down slot_handle.src = "lever-dn.png"; } } function initiatePull() { // Show the handle flipping back up slot_handle.src = "lever-up.png"; // Set all three wheels "spinning" slot_L.src = "slotpullanimation.gif"; slot_M.src = "slotpullanimation.gif"; slot_R.src = "slotpullanimation.gif"; // Set app status to spinning isSpinning = true; // Call the Lambda function to collect the spin results lambda.invoke(pullParams, function(err, data) { if (err) { prompt(err); } else { pullResults = JSON.parse(data.Payload); displayPull(); } }); } function displayPull() { isSpinning = false; if (pullResults.isWinner) { winner_light.visibility = visible; } $("#slot_L").delay(4000).attr("src", pullResults.leftWheelImage.file.S); $("#slot_M").delay(6500).attr("src", pullResults.midWheelImage.file.S); $("#slot_R").delay(9000).attr("src", pullResults.rightWheelImage.file.S); } </script> </head> <body> <div id="appframe"> <img id="slot_L" src="puppy.png" height="199" width="80" alt="slot wheel 1"/> <img id="slot_M" src="puppy.png" height="199" width="80" alt="slot wheel 2"/> <img id="slot_R" src="puppy.png" height="199" width="80" alt="slot wheel 3"/> <img id="winner_light" src="winner.png" height="48" width="247" alt="winner indicator"/> </div> </body> </html>