无法取消绑定事件监听器 - turbolinks缓存出现问题 [英] Unable to unbind event listener - trouble with turbolinks caching

问题描述

我正在绑定然后将ready事件侦听器解绑定到文档。

  $（document）.bind（ready，readyEventHandler）; 
 
 function readyEventHandler（）{
 //运行一些代码
 
 $（document）.unbind（ready）; 
} 
  

代码不会产生任何错误并且可以正常工作。但是，我的javascript被缓存并复制了代码，所以如果我回去然后在浏览器中转发页面，我最终会运行这个代码不止一次。发生这种情况时，根本不会调用ready事件侦听器。我是否正确解除了此事件监听器的绑定？我知道缓存问题变得有问题（这是它自己的独立问题）但我只是想绑定ready事件监听器，让它运行代码，然后取消绑定它。

解决方案

不太确定它会有所帮助，但这是我的2美分 - 而不是试图解开 readyEventHandler - 确保如果你运行函数一旦不会运行两次：

  var readyHandlerRun = false; 
 
 $（document）.bind（ready，readyEventHandler）; 
 
函数readyEventHandler（）{
 if（readyHandlerRun）{
 return; 
} 
 readyHandlerRun = true; 
 //其余代码... 
} 
  

另一个选项刚刚弹出：

  $（document）.bind（ready， readyEventHandler）; function readyEventHandler（）{readyEventHandler = function（）{} console.log（'ready'）; //其余代码......}  

 < script src =https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js>< / script>  

更新（由@ jason328提供）

<在与Dekel交谈后，他给了我适当的答案。

  $（文件）.bind（ready，function（ ）{
 readyEventHandler（）; 
 readyEventHandler = function（）{} 
}）; 
  

优雅，就像魅力一样！

I'm binding then unbinding the ready event listener to the document.

$(document).bind("ready", readyEventHandler);

function readyEventHandler() {
  // run some code

  $(document).unbind("ready");
}

The code produces no errors and will work. However, my javascript is cached and duplicates the code so I'll end up with having this code run more than once if I go back and then forward a page in the browser. When this happens, the ready event listener is not called at all. Am I properly unbinding this event listener? I know the caching issue becomes problematic(it's own separate issue) but I just want to bind the ready event listener, have it run code, then unbind it.

解决方案

Not so sure it will help, but here are my 2 cents - instead of trying to unbind the readyEventHandler - make sure that if you run the function once it will not run twice:

var readyHandlerRun = false;

$(document).bind("ready", readyEventHandler);

function readyEventHandler() {
    if (readyHandlerRun) {
        return;
    }
    readyHandlerRun = true;
    // Rest of your code...
}

Another options that popped just now:

$(document).bind("ready", readyEventHandler);
function readyEventHandler() {
  readyEventHandler = function() { }  
  
  console.log('ready');
  // Rest of your code...
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

UPDATE (by @jason328)

After talking with Dekel he provided me the appropriate answer.

$(document).bind("ready", function() {
    readyEventHandler();
    readyEventHandler = function() { }
});

Elegant and works like a charm!

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