selenium：滚动到页面结尾

selenium：滚动到页面结尾

根据页面的实现方式，滚动到动态页面的底部可能具有挑战性。

首先，您必须使用滚动条找到该容器，因为它可能与链接的容器不同

window.scrollTo

。

然后，通过增加容器滚动

scrollTop

直到

scrollHeight

变得稳定，没有待处理的请求。要检查是否有待处理的请求，请评估

jQuery.active

页面是否具有JQuery或挂钩

XMLHttpRequest

以监视上的调用

send

。

这是一个在通用函数上使用多次滚动到页面底部或直到末尾的示例：

var webdriver = require('selenium-webdriver');var driver = new webdriver.Builder().forBrowser('chrome').build();driver.get('https://groups.google.com/forum/#!search/webdriverjs'); // scroll to the bottom 3 timesdriver.executeAsyncscript(scrollBottom, 3)  .then(n => console.log(`scrolled ${n} time(s)`)); // scroll to the bottom until the enddriver.executeAsyncscript(scrollBottom)  .then(n => console.log(`scrolled ${n} time(s)`));function scrollBottom(){  var count = arguments[arguments.length - 2] || 0x7fffffff;  var callback = arguments[arguments.length - 1];    var elm = document.elementFromPoint(window.innerWidth - 25, window.innerHeight / 2);  for ( ;elm && (++elm.scrollTop, !elm.scrollTop); elm=elm.parentElement);  elm = elm || document.documentElement;    if (!('idle' in XMLHttpRequest)) (function(){    var n = 0, t = Date.now(), send = XMLHttpRequest.prototype.send;    var dispose = function(){ --n; t = Date.now(); };    var loadend = function(){ setTimeout(dispose, 1) };    XMLHttpRequest.idle = function() { return n > 0 ? 0 : Date.now() - t; };    XMLHttpRequest.prototype.send = function(){      ++n;      this.addEventListener('loadend', loadend);      send.apply(this, arguments);    };  })();    var i = 0, scrollHeight = -1, scrollTop = -1;  (function scroll(){    if ((scrollHeight === elm.scrollHeight || i === count) && XMLHttpRequest.idle() > 60)      return callback(i);    scrollTop = elm.scrollTop;    scrollHeight = elm.scrollHeight;    if (i < count)      i += (elm.scrollTop = 0x7fffffff, scrollTop !== elm.scrollTop);    setTimeout(scroll, 100);  })();}

或通过滚动直到高度在特定时间（此处为5秒）不再增加为止：

function scrollBottom(){  var count = arguments[arguments.length - 2] || 0x7fffffff;  var callback = arguments[arguments.length - 1];  var timeout = 5000;    var i = 0;    var elm = document.elementFromPoint(window.innerWidth - 25, window.innerHeight / 2);  for ( ;elm && (++elm.scrollTop, !elm.scrollTop); elm=elm.parentElement);  elm = elm || document.documentElement;    (function scroll(){    var endtime = Date.now() + timeout;    var height = elm.scrollHeight;    elm.scrollTop = 0x7fffffff;      setTimeout(function check(){      if (Date.now() > endtime)         callback(i);      else if (elm.scrollHeight == height)         setTimeout(check, 60);      else if (++i === count)           callback(i);      else        setTimeout(scroll, 60);    }, 250);  })();}