chaining | 易学教程

jQuery chaining and cascading then's and when's

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问题 I currently have a humongous if-then-else loop in front of me which first gets multiple cantinas from a webservice. Then it gets all available meals (for each menu) and all available side dishes (for each menu). For each of the meals as well as the sides it then checks for all additives and aggregates them. In the end I have multiple menus with meals, side dishes and all their additives. The following flowchart shows the process: I want to beautify the code and want to make use of promises

AngularJS - Delaying filter until after loading AJAX calls

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问题 I want to know how I can delay the filter functionality until after loading all the data through AJAX calls. I'm trying to filter through data, but I can't filter some of them since they're not loaded until the AJAX calls. Is there a way to either delay the filter functionality or disable and enable it after all data is loaded? Update The way that the data structure is set up is that I make an AJAX call and load a list of posts made by different users. Afterwards, I call two other AJAX calls

Using && in subprocess.Popen for command chaining?

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问题 I'm using subprocess.Popen with Python , and I haven't come across an elegant solution for joining commands (i.e. foobar && bizbang) via Popen . I could do this: p1 = subprocess.Popen(["mmls", "WinXP.E01"], stdout=subprocess.PIPE) result = p1.communicate()[0].split("\n") for line in result: script_log.write(line) script_log.write("\n") p1 = subprocess.Popen(["stat", "WinXP.E01"], stdout=subprocess.PIPE) result = p1.communicate()[0].split("\n") for line in result: script_log.write(line) But

In QT, chaining models does not work as expected

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问题 Alright, I have a really basic QStandardItemModel , filled with some numbers. I managed to display it in a QTableView , it's ok. I created a new model ( subclass either of QAbstractItemModel or QAbstractProxyModel ), which is some kind of a layer of an existing model - it is needed to set the sourcemodel, and this new layer should do some transformations on the real one. My problem is, that in the top layer, say "layer model" the data( const QModelIndex & index, int role ) member function

How to use token between action chains, properly?

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I have an action which I should protect it from CSRF attack. I have used Strut's tokenSession Interceptor to achieve this. <action name="showBranchSelection" class="action.Request.BranchSelectionAction" method="showBranchSelection"> <interceptor-ref name="tokenSession" /> <interceptor-ref name="basicStack" /> <result name="success"> /jsp/customer/request/branchSelection.jsp </result> </action> and works great where this action has been called directly from jsp. <s:form id="frmRequestShowBranchSelection" action="../../showBranchSelection" method="post" theme="simple" onsubmit="return false;">

Chaining operation and order of evaluation on the same object

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Consider a class MyClass with: a member function myClass& myFunction1(int) that modifies the object and returns *this a member function int myFunction2() const that does not modify the object Does the C++11/14 standard guarantee that: myclass.myFunction1(myclass.myFunction2()).myFunction1(myclass.myFunction2()); is equivalent to: myclass.myFunction1(myclass.myFunction2()); myclass.myFunction1(myclass.myFunction2()); No. The compiler can first call myclass.myFunction2() twice and then do the two myFunction1 calls in the first example code. But not in the second example code. There is nothing

How to chain a SSL certificate

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问题 Is there any way we can chain our own generated key pair with an existing certificate which has been chained to a root CA (eg: verisign)? Basically my question is described in diagram below Verisign Root CA | --> Company XYZ certificate | ---> Server foo certificate Once i've generated key pair for server foo, how do I chain it with Company XYZ cert? 回答1: If Company XYZ has an Intermediate Certificate Authority certificate then you can. This kind of certificates are authorized by the root CA

Android IsoDep command chaining failure

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I am making a NFC application that use ISO-DEP (ISO 14443-4) as TagTechnology. I try to execute a authentication with a DESFire EV1. The authentication work well if the chaining of the command is without pause. But if for exemple, I make something that take time (like the Thread.Sleep after NATIVE_AUTHENTICATION_COMMAND_P1) I got an error 0x911C ("Command code not supported") during the authentication command part 2 from the card. Normaly the error come when the authentication has been canceled. Like if the card got another command during the authentication procedure that have nothing about it

How to chain async methods in javascript ES6 classes

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I want to chain methods from a class. I have o problems with synchronous methods, but I don't know how to do it with asynchronous methods. For example, this class: class Example { constructor() { this.val = 0 } async () { setTimeout(() => { this.val += 1 return this }, 5000) } sync () { this.val += 1 return this } check () { console.log('checker', this.val) return this } } This works: new Example().sync().check() > 1 But this doesn't work: new Example().async().check() > TypeError: Cannot read property 'check' of undefined P.S. I want chaining, not Hell Callbacks. I expect that you want to

How does this implementation of chaining exceptions work?

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问题 I previously asked a question about how to chaining exceptions in C++, and one of the answers provided a nifty solution to how it can be done. The problem is that I don't understand the code, and trying to have this kind of discussion in the comments is just too much of a bother. So I figured it's better to start a new question entirely. The code is included below and I've clearly marked each section which I don't get. A description of what I don't understand is included below the code. The