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September 14, 2018 17:19
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Fuse JS Web Worker implementation
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| /************************ | |
| search.js | |
| ************************/ | |
| // an example of how to implement fuse.js with a web worker | |
| var searchWorker; // initialized in document ready function | |
| if(typeof(Worker) !== "undefined") { | |
| if(typeof(searchWorker) == "undefined") { | |
| searchWorker = new Worker('/scripts/searchWorker.js'); | |
| } | |
| searchWorker.addEventListener('message', function(e) { | |
| var result = e.data.result; | |
| var submitForm = e.data.submitForm; | |
| var input = jQuery('#' + e.data.inputID); | |
| setFaytResults(result, input, submitForm); | |
| }); | |
| searchWorker.addEventListener('error', function(e) { | |
| // if we want error handling, put it here | |
| console.log(e); | |
| }); | |
| } else { | |
| // no web worker support - do we need/want a fallback? | |
| } | |
| function searchFuse(options, val, inputID, submitForm) { | |
| var searchData = getSearchData(); | |
| searchWorker.postMessage({ | |
| searchData: searchData, | |
| options: options, | |
| val: val, | |
| inputID: inputID, | |
| submitForm: submitForm | |
| }); | |
| } | |
| /************************ | |
| searchWorker.js | |
| ************************/ | |
| /** | |
| * Add event handler for "message" event. | |
| * This is triggered whenever worker.postMessage() is called | |
| * from the parent script. | |
| * | |
| * This function takes an event object with data bound to the `data` property. | |
| * `input` and `submitForm` values are not used, but they are required in the | |
| * message handler in the parent - thus, they are simply passed through. | |
| * | |
| * This function initializes a FuseJS object with the search options and then | |
| * performs a search for the given value. The result array is returned in a message. | |
| */ | |
| // required to get access to the Fuse object | |
| // self is the way to access the global scope within a web worker | |
| self.importScripts('fuse/fuse.min.js'); | |
| onmessage = function receiver(e) { | |
| var searchData = e.data.searchData; | |
| var options = e.data.options; | |
| var val = e.data.val; | |
| var inputID = e.data.inputID; | |
| var submitForm = e.data.submitForm; | |
| try { | |
| var fuse = new Fuse(searchData, options); | |
| var result = fuse.search(val); | |
| } catch (e) { | |
| // assume this failed because FuseJS hadn't loaded yet. Load again and repeat | |
| self.importScripts('fuse/dist/fuse.min.js'); | |
| var fuse = new Fuse(searchData, options); | |
| var result = fuse.search(val); | |
| } | |
| // this will trigger the "message" event on the worker in the parent script. | |
| // That is, the "onmessage" handler will be called whenever `postMessage()` is called. | |
| postMessage({ | |
| result: result, | |
| submitForm: submitForm, | |
| inputID: inputID | |
| }); | |
| } |
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