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Fetching paginated data in order with BaconJS
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| <script src="https://code.jquery.com/jquery-2.1.3.min.js"></script> | |
| <script src="https://rawgit.com/baconjs/bacon.js/master/dist/Bacon.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.8.0/lodash.js"></script> | |
| </head> | |
| <body> | |
| <script id="jsbin-javascript"> | |
| var pages = Bacon.fromArray([1,2,3,4,5]) | |
| var requests = pages.flatMapWithConcurrencyLimit(1, function(page) { | |
| return doAjax(page) | |
| .map(function(value) { | |
| return { | |
| page: page, | |
| value: value | |
| } | |
| }) | |
| }).log("Data received") | |
| var allData = requests.fold([], function(arr, data) { | |
| return arr.concat([data]) | |
| }).map(function(arr) { | |
| // I would normally write this as a oneliner | |
| var sorted = _.sortBy(arr, "page") | |
| var onlyValues = _.pluck(sorted, "value") | |
| var inOneArray = _.flatten(onlyValues) | |
| return inOneArray | |
| }) | |
| allData.log("All data") | |
| function doAjax(page) { | |
| // This would actually be Bacon.fromPromise($.ajax...) | |
| // Math random to simulate the fact that requests can return out | |
| // of order | |
| return Bacon.later(1 + Math.random() * 500, [ | |
| "Page"+page+"Item1", | |
| "Page"+page+"Item2"]) | |
| } | |
| </script> | |
| <script id="jsbin-source-javascript" type="text/javascript">var pages = Bacon.fromArray([1,2,3,4,5]) | |
| var requests = pages.flatMapWithConcurrencyLimit(1, function(page) { | |
| return doAjax(page) | |
| .map(function(value) { | |
| return { | |
| page: page, | |
| value: value | |
| } | |
| }) | |
| }).log("Data received") | |
| var allData = requests.fold([], function(arr, data) { | |
| return arr.concat([data]) | |
| }).map(function(arr) { | |
| // I would normally write this as a oneliner | |
| var sorted = _.sortBy(arr, "page") | |
| var onlyValues = _.pluck(sorted, "value") | |
| var inOneArray = _.flatten(onlyValues) | |
| return inOneArray | |
| }) | |
| allData.log("All data") | |
| function doAjax(page) { | |
| // This would actually be Bacon.fromPromise($.ajax...) | |
| // Math random to simulate the fact that requests can return out | |
| // of order | |
| return Bacon.later(1 + Math.random() * 500, [ | |
| "Page"+page+"Item1", | |
| "Page"+page+"Item2"]) | |
| }</script></body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| var pages = Bacon.fromArray([1,2,3,4,5]) | |
| var requests = pages.flatMapWithConcurrencyLimit(1, function(page) { | |
| return doAjax(page) | |
| .map(function(value) { | |
| return { | |
| page: page, | |
| value: value | |
| } | |
| }) | |
| }).log("Data received") | |
| var allData = requests.fold([], function(arr, data) { | |
| return arr.concat([data]) | |
| }).map(function(arr) { | |
| // I would normally write this as a oneliner | |
| var sorted = _.sortBy(arr, "page") | |
| var onlyValues = _.pluck(sorted, "value") | |
| var inOneArray = _.flatten(onlyValues) | |
| return inOneArray | |
| }) | |
| allData.log("All data") | |
| function doAjax(page) { | |
| // This would actually be Bacon.fromPromise($.ajax...) | |
| // Math random to simulate the fact that requests can return out | |
| // of order | |
| return Bacon.later(1 + Math.random() * 500, [ | |
| "Page"+page+"Item1", | |
| "Page"+page+"Item2"]) | |
| } |
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