{"id":31250,"date":"2023-01-20T08:49:49","date_gmt":"2023-01-20T03:19:49","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-using-jquery-deferred-and-promise-inside-loop\/"},"modified":"2023-01-20T08:49:49","modified_gmt":"2023-01-20T03:19:49","slug":"solved-using-jquery-deferred-and-promise-inside-loop","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-using-jquery-deferred-and-promise-inside-loop\/","title":{"rendered":"[Solved] Using jQuery deferred and promise inside loop"},"content":{"rendered":"

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I think you can do something as simple as this:<\/p>\n

var sortedArray = [AList, BList, CList, DList];\n\nPromise.all(sortedArray.map(function(value) {\n    var url = ...;\n    return getListItems(url);\n})).then(function(results) {\n    \/\/ results is an array of results from AList, BList, CList, DList in order\n    let allJsonData = [];\n    results.forEach(function(approvedListItems) {\n        allJsonData.push.apply(allJsonData, approvedListItems.d.results);\n    });\n    \/\/ process allJsonData here\n});\n\n\/\/ simplify getListItems like this\ngetListItems: function(url) {       \n    return $.ajax({\n        url: url,\n        type: \"GET\",\n        headers: {\n            \"accept\": \"application\/json;odata=verbose\",\n        }\n    });\n},\n<\/code><\/pre>\n
The general idea here is that you get a raw list (without processing the sub-results inside of it) for each of the items in sortedArray.  Using either Promise.all()<\/code> or $.when()<\/code>, you will get the raw lists in order.  Then, after you have all the raw lists, you can process them in order and build your allJsonData structure in order.  <\/p>\n
Also, you can remove the promise anti-pattern from getListItems()<\/code>.  $.ajax()<\/code> already returns a promise so there is no need to wrap it in another promise.<\/p>\n
You could convert this to use $.when()<\/code> instead of Promise.all()<\/code> if you really wanted to, but it is more complicated to use $.when()<\/code> because of how it takes arguments and returns results.<\/p>\n
Also, there’s something wrong with the Javascript string syntax in your url<\/code> variable.  I don’t know what you intended to do there so I’m not sure what to suggest, but you need to fix that too.<\/p>\n<\/p><\/div>\n
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solved Using jQuery deferred and promise inside loop <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] I think you can do something as simple as this: var sortedArray = [AList, BList, CList, DList]; Promise.all(sortedArray.map(function(value) { var url = …; return getListItems(url); })).then(function(results) { \/\/ results is an array of results from AList, BList, CList, DList in order let allJsonData = []; results.forEach(function(approvedListItems) { allJsonData.push.apply(allJsonData, approvedListItems.d.results); }); \/\/ process allJsonData here … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[388,5817,4236],"class_list":["post-31250","post","type-post","status-publish","format-standard","hentry","category-solved","tag-jquery","tag-jquery-deferred","tag-object-literal"],"yoast_head":"\n[Solved] Using jQuery deferred and promise inside loop - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-using-jquery-deferred-and-promise-inside-loop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Using jQuery deferred and promise inside loop - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I think you can do something as simple as this: var sortedArray = [AList, BList, CList, DList]; Promise.all(sortedArray.map(function(value) { var url = ...; return getListItems(url); })).then(function(results) { \/\/ results is an array of results from AList, BList, CList, DList in order let allJsonData = []; results.forEach(function(approvedListItems) { allJsonData.push.apply(allJsonData, approvedListItems.d.results); }); \/\/ process allJsonData here ... 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