callback

Passing a callback function to jQuery AJAX success function

由 丶灬走出姿态 提交于 2020-01-22 17:42:08
问题 I'm trying to pass in a function to run when the AJAX call is successful, however it's not working as it say's that "callback is not a function". Example: Calling Code: getGrades(var); JS: function getGrades(grading_company) { // Set file to get results from.. var loadUrl = "ajax_files/get_grades.php"; // Set data string var dataString = 'gc_id=' + grading_company; // Set the callback function to run on success var callback = 'showGradesBox'; // Run the AJAX request runAjax(loadUrl,

Passing a callback function to jQuery AJAX success function

由 房东的猫 提交于 2020-01-22 17:42:07
问题 I'm trying to pass in a function to run when the AJAX call is successful, however it's not working as it say's that "callback is not a function". Example: Calling Code: getGrades(var); JS: function getGrades(grading_company) { // Set file to get results from.. var loadUrl = "ajax_files/get_grades.php"; // Set data string var dataString = 'gc_id=' + grading_company; // Set the callback function to run on success var callback = 'showGradesBox'; // Run the AJAX request runAjax(loadUrl,

How to Pass an Object Method as a Parameter in Delphi, and then Call It?

由 给你一囗甜甜゛ 提交于 2020-01-22 13:26:49
问题 I fear this is probably a bit of a dummy question, but it has me pretty stumped. I'm looking for the simplest way possible to pass a method of an object into a procedure, so that the procedure can call the object's method (e.g. after a timeout, or maybe in a different thread). So basically I want to: Capture a reference to an object's method. Pass that reference to a procedure. Using that reference, call the object's method from the procedure. I figure I could achieve the same effect using

How to Pass an Object Method as a Parameter in Delphi, and then Call It?

由 五迷三道 提交于 2020-01-22 13:26:13
问题 I fear this is probably a bit of a dummy question, but it has me pretty stumped. I'm looking for the simplest way possible to pass a method of an object into a procedure, so that the procedure can call the object's method (e.g. after a timeout, or maybe in a different thread). So basically I want to: Capture a reference to an object's method. Pass that reference to a procedure. Using that reference, call the object's method from the procedure. I figure I could achieve the same effect using

Nodejs Mongoose - how to avoid callback hell?

由 家住魔仙堡 提交于 2020-01-22 00:55:08
问题 I might be doing it wrong with Mongoose after using it for a while. I find it difficult to read when you have too much callbacks, eg: I want to find a document and update it. I need to find it first, then the update will be inside the callback of the findOne . var sam = new Character({ name: 'Sam', inventory: {}}); Character.findOne({ name: 'Sam' }, function(err, character) { console.log(character); // now I want to update it. character.update({... }, function(err, characterID) { // now I

每周一个 Python 标准库 | contextlib

由 别说谁变了你拦得住时间么 提交于 2020-01-21 19:49:04
技术博客：https://github.com/yongxinz/tech-blog 同时，也欢迎关注我的微信公众号 AlwaysBeta ，更多精彩内容等你来。 用于创建和使用上下文管理器的实用程序。 contextlib 模块包含用于处理上下文管理器和 with 语句的实用程序。 Context Manager API 上下文管理器负责一个代码块内的资源，从进入块时创建到退出块后清理。例如，文件上下文管理器 API，在完成所有读取或写入后来确保它们已关闭。 with open ( '/tmp/pymotw.txt' , 'wt' ) as f : f . write ( 'contents go here' ) # file is automatically closed with 语句启用了上下文管理器，API 涉及两种方法：当执行流进入内部代码块时运行 __enter__() 方法，它返回要在上下文中使用的对象。当执行流离开 with 块时，调用上下文管理器的 __exit__() 方法来清理正在使用的任何资源。 class Context : def __init__ ( self ) : print ( '__init__()' ) def __enter__ ( self ) : print ( '__enter__()' ) return self def _

Proper way of using loops in Promises

由 眉间皱痕 提交于 2020-01-21 12:57:37
问题 According to this link (Rookie mistake #2) I should not use loops within Promises, but instead Promise.all(iterable) . Does this really apply to all loops? Promise.all(iterable) takes an array of size n. If I'd use Promise.all(iterable) , then I'd get as a result (i.e. iterable_A) an array of the size n. What if I want to iterate through iterable and only want to put certain elements that satisfy my condition to another iterable (e.g. iterable_B) and want to return the iterable_B instead of

Is it possible to define a function using a callback type definition?

由 独自空忆成欢 提交于 2020-01-21 11:49:29
问题 I'm interested in defining a function using a predefined callback type. Let's assume I have defined callback type: typedef BOOL (*is_trigger_required_cb)(void); Now I would like to declare and define a function using the above type. I would like to do something like: is_trigger_required_cb my_func { /* function implementation which accepts void and returns BOOL */ } This won't compile due to: error: expected ';' after top level declarator To my understanding it is not possible since the

Is it possible to define a function using a callback type definition?

由 ￣綄美尐妖づ 提交于 2020-01-21 11:49:09
问题 I'm interested in defining a function using a predefined callback type. Let's assume I have defined callback type: typedef BOOL (*is_trigger_required_cb)(void); Now I would like to declare and define a function using the above type. I would like to do something like: is_trigger_required_cb my_func { /* function implementation which accepts void and returns BOOL */ } This won't compile due to: error: expected ';' after top level declarator To my understanding it is not possible since the

Python Tkinter one callback function for two buttons

由 帅比萌擦擦* 提交于 2020-01-21 05:23:24
问题 I have been looking around for a long time for answers to this question but still hasn't find anything. I am creating a GUI using Tkinter, and I have two buttons that do mostly the same thing except they receive information from different widgets. One button is for an Entry widget and the other is for a Listbox widget. The callback function for these two buttons is long (about 200 lines), so I don't want to have separate functions for each button. I have if-statements in the beginning of this
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