javascript - Can't understand zone.js example -


here's code demonstrating zone.js capabilities here:

zone.current.fork({}).run(function () {     zone.current.inthezone = true;      settimeout(function () {         console.log('in zone: ' + !!zone.current.inthezone);     }, 0); });  console.log('in zone: ' + !!zone.current.inthezone);

the above log:

'in zone: false'  'in zone: true'

i don't understand zone doing here , how's related intercepting events this video talks about.

it outputs false first time because zone.current.inthezone undefined, , since changed zone.current.inthezone = true; value ouputted second time. what's special zone doing here?

zone allows persist properties across asynchronous operations encapsulated within zone. here shows there's no inthezone property attached current zone. when executed zone.fork().run() callback executed in new forked zone , async task settimeout executed in forked zone well. , inthezone property inside zone won't accessible in other zones. here better example:

zone.current.fork({}).run(function () {     zone.current.inthezone = true;      settimeout(function () {         console.log('in zone: ' + !!zone.current.inthezone); // true     }, 2000); });  settimeout(function () {     console.log('in zone: ' + !!zone.current.inthezone); // false }, 1000);

as can see there 2 async tasks here. , settimeout current zone executed earlier timeout forked zone. run() synchrounous inthezone should set true before first settimetout executed. it's logged false because current zone can't access property forked zone.


Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more