如何在JavaScript / CoffeeScript中优雅地循环链接调用？ [英] How to loop chained calls elegantly in JavaScript/CoffeeScript?

问题描述

我正在使用 Soda 在Node.js中编写Selenium测试，但遇到这种情况必须多次按下向下键。

I'm using Soda to write Selenium tests in Node.js and I have a situation where I have to press the down key several times.

当前代码如下：

browser                                                                     
  .chain                                                                    
  .setSpeed(200)                                                            
  .session()                                                                
  .open('/')                                                                
  .click("id=save")                                                         
  .focus(editor)                                                            
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  
  .keyDown(editor, '\\40')                                                  

  ...                                                                       

我该如何干燥呢？

仅使用像这样的循环不适用于此库：

Just using a loop like this does not work with this lib:

var b = browser.chain()                                                     
for (var i = 0; i < 10; i++) {                                              
  b.keyDown(editor, '\\40')                                                 
}                                                                           

很棒的主意吗？

我可以在Soda中使用异步API，例如 async -lib 来帮助我，但这不是我要问的。

I could use the async API in Soda and for example async-lib to help me out, but that's not what I'm asking here. It makes some other things ugly.

推荐答案

有一种方法叫做和在命令链中间执行复杂的操作：

There is a method called and for doing complicated things in the middle of a command chain:

browser
  .chain
  .setSpeed(200)
  .session()
  .open('/')
  .click("id=save")
  .focus(editor)
  .and(function (browser) {
    for (var i = 0; i < 10; i++) {
      browser.keyDown(editor, '\\40')
    }
  })
  ...

有关详细信息，请参见自述文件： https://github.com/learnboost/soda

See the README for more information: https://github.com/learnboost/soda

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