为什么硒不能添加事件监听器？

Question

I tried this code (C#) :

string javascript = "window.document.addEventListener('domready', function(){alert('READY');}, false);console.log('test');"
((IJavaScriptExecutor)d).ExecuteScript(javascript);

The formatted Javascript code is :

window.document.addEventListener(
  'domready', 
  function() {
    alert('READY');
  }, 
  false);
console.log('test');

The "READY" popup never show up. Do you have an idea on how to solve this problem ?

The javascript is executed as soon as the page start loading (the console.log('test') command is executed before anything is displayed on the screen).

Answer 1

I believe that the READY popup never shows because the event listener is added after 'domready' fires its event. You might be able to leverage document.readyState === "complete" to achieve what you want, by simply doing something like:

if (document.readyState === "complete") {
  // do stuff
} else {
  window.document.addEventListener('domready', doStuff);
}

Hopefully this helps!