getjson | 易学教程

How can I get javascript to read from a .json file?

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问题 My script currently looks like this: <script type="text/javascript"> function updateMe(){ var x = 0; var jsonstr = '{"date":"July 4th", "event":"Independence Day"}'; var activity=JSON.parse(jsonstr); while(x<10){ date = document.getElementById("date"+x).innerHTML = activity.date; event = document.getElementById("event"+x).innerHTML = activity.event; x++; } } </script> Where date"x" and event"x" are a series of html tags. This function runs when the page loads (onload). My goal is to do this

Uncaught TypeError: Cannot use 'in' operator to search for 'length' in

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Uncaught TypeError: Cannot use 'in' operator to search for 'length' in " This is the error I receive when I try to do a $.each to this JSON object : {"type":"Anuncio","textos":["Probando esto","$ 20150515"],"submit":"codParameters?___DDSESSIONID\u003d14EA4721A904D6DD71591156996E29F7%3A%2FMobilTest"} I have also tried to do the same with stringify, but I receive the same error: {\"type\":\"Anuncio\",\"textos\":[\"Probando esto\",\"$ 20150515\"],\"submit\":\"codParameters?___DDSESSIONID\\u003d06CBEC9D1A53616EFF703A8C71FBC2B4%3A%2FMobilTest\"}" If I remove parameters ___DDSESSIONID\

How to return a value from a function that calls $.getJSON?

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问题 function lookupRemote(searchTerm) { var defaultReturnValue = 1010; var returnValue = defaultReturnValue; $.getJSON(remote, function(data) { if (data != null) { $.each(data.items, function(i, item) { returnValue = item.libraryOfCongressNumber; }); } }); return returnValue; } Why is the returnValue from this function alway equal to the default value set at the beginning of the function and never to the value retrieved from the JSON lookup? 回答1: This happens because that callback function (

How to use getJSON, sending data with post method?

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问题 I am using above method & it works well with one parameter in URL. e.g. Students/getstud/1 where controller/action/parameter format is applied. Now I have an action in Students controller that accepts two parameters and return a JSON object. So how do I post data with $.getJSON() using post method? Similar methods are also acceptable. The point is to call an action of the controller with AJAX. 回答1: The $.getJSON() method does an HTTP GET and not POST. You need to use $.post() $.post(url,

load json into variable

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I have to do something very simple, but there doesn't seem to be an easy way to do this, as far as I can tell. I just want to load JSON data from a remote source and store it in a global Javascript variable using jQuery. Here's what I have: var my_json; $.getJSON(my_url, function(json) { var my_json = json; }); The my_json variable remains undefined. I think this is clearly a scope issue. It seems to me the $.getJSON method should return JSON, but it returns an XMLHttpRequest object. If I do this: request = $.getJSON(my_url); my_json = request.responseText.evalJSON(); That doesn't work because

$.getJSON returning cached data in IE8

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问题 I\'m playing around with ASP.net MVC and JQuery at the moment. I\'ve come across behavour which doesn\'t seem to make sense. I\'m calling JQuery\'s $.getJSON function to populate some div\'s. The event is triggered on the $(document).ready event. This works perfectly. There is a small AJAX.BeginForm which adds another value to be used when populating the divs. It calls the remote function correctly and upon success calls the original javascript function to repopulate the divs. Here is the

Error handling in getJSON calls

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问题 How can you handle errors in a getJSON call? Im trying to reference a cross-domain script service using jsonp, how do you register an error method? 回答1: $.getJSON() is a kind of abstraction of a regular AJAX call where you would have to tell that you want a JSON encoded response. $.ajax({ url: url, dataType: 'json', data: data, success: callback }); You can handle errors in two ways: generically (by configuring your AJAX calls before actually calling them) or specifically (with method chain).

Is it possible to set async:false to $.getJSON call

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Is it possible to set async: false when calling $.getJSON() so that the call blocks rather than being asynchronous? Nick Craver You need to make the call using $.ajax() to it synchronously, like this: $.ajax({ url: myUrl, dataType: 'json', async: false, data: myData, success: function(data) { //stuff //... } }); This would match currently using $.getJSON() like this: $.getJSON(myUrl, myData, function(data) { //stuff //... }); velja Both answers are wrong. You can. You need to call $.ajaxSetup({ async: false }); before your json ajax call. And you can set it to true after call retuns ( if there

how to read json result in jquery?

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问题 I\'m not familiar with jquery. Will you please help me in this? I have a json respone from url but i don\'t know how, can i read key value in jquery. For example, how to get the \"HAWBItemEntity\" value? Please check the below json-response. { \"waybill_log\": { \"TrackingResult\": { \"HAWBEntity\": { \"HAWBID\": 282829899, }, \"HAWBHistoryEntity\": [ { \"ActionDate\": \"4/26/2014 12:32:00 PM\", }, { \"ActionDate\": \"4/26/2014 12:32:00 PM\", } ], \"HAWBAttachmentEntity\": [ { \"FileName\": \

How to set cache false for getJSON in jQuery?

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问题 I am using getJSON to fetch the results from server side but facing browser cache problems. I want the cache to be false. I tried using this just before my getJSON call. $.ajaxSetup({ cache: false }) But I am not getting the expected results. It still shows the old results. I also identified some other solutions such as using .ajax but I really don\'t want to use that. 回答1: Your code just needs a trigger for it to be enabled. This will allow you to disable cache in all future ajax $(document)