Web workers | JavaScript | HTML API
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Web workers are scripts which are runs in background without interrupting UI threads. Web workers communication happening through event messaging concept.
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- 1. Web Workers JAGADEESH PATTA( PJ )
- 2. Agenda Introduction Steps to create service worker.
- 3. Introduction Web workers are scripts that are runs in background threads. Web worker thread perform tasks without interfering UI thread. Web workers can perform I/O operations using XMLHttpRequest.
- 4. Introduction(cont…) Web workers can communicate with UI thread using event messages.
- 5. Steps to create web worker Create web worker file Create object for web worker Communication with Web Worker Terminate web worker
- 6. Create web worker file Step-1: Check weather the browser supports the web workers or not. If ( typeof Worker !== “undefined” ) { // Your browser supports web workers } else { // Your browser not supporting web workers. }
- 7. Create web worker file(cont…) Step-2(web-worker-name.js): var count = 0; function getCount(){ count = count + 1; postMessage(count); setTimeout(“getCount()”, 1000); } getCount();
- 8. Create Object for web worker Web worker file and current JavaScript code must be comes under same origin. Check existence of web worker object. If ( typeof workerObj == “undefined” ) { workerObj = new Worker(“web-worker-name.js”); }
- 9. Communication with Web Worker The communication between web worker and UI thread done by event messages. Send / Receive data using postMessage and onmessage methods. Step-1(send data from web worker): postMessage(“content needs to be send”);
- 10. Communication(cont…) Step-2(Receive data from web worker): workerObj.onmessage = function(event){ var element = document.getElementById(‘id’); element.innerHTML = event.data; }
- 11. Terminating web worker check weather the workerObj is undefined or not. if ( typeof workerObj !== “undefined” ) { workerObj.terminate(); }
- 12. Questions ?
- 13. Thank You