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[英]How do I recover the full html of a page, including what is generated by javascript
[英]How do i Screen scrape html page generated by javascript
我如何屏幕抓取由 javascript 生成的 html 頁面? 我試過這樣的事情:
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
HtmlWeb hw = new HtmlWeb();
doc = hw.Load("http://stats.nba.com/scores.html?gameDate=04/11/2014");
HtmlNodeCollection nodes = doc.DocumentNode.SelectNodes("//div[@id='scoreboards']");
但是這不起作用,因為內容是由 javascript 生成的。 在 javascript 生成 html 后,有沒有辦法抓取頁面? 也許使用其他敏捷包?
使用 webbrowser 控件獲取由 js 或 ajax 加載的內容和元素
private void LoadHtmlWithBrowser(String url)
{
webBrowser1.ScriptErrorsSuppressed = true;
webBrowser1.Navigate(url);
waitTillLoad(this.webBrowser1);
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
var documentAsIHtmlDocument3 = (mshtml.IHTMLDocument3)webBrowser1.Document.DomDocument;
StringReader sr = new StringReader(documentAsIHtmlDocument3.documentElement.outerHTML);
doc.Load(sr);
}
private void waitTillLoad(WebBrowser webBrControl)
{
WebBrowserReadyState loadStatus;
int waittime = 100000;
int counter = 0;
while (true)
{
loadStatus = webBrControl.ReadyState;
Application.DoEvents();
if ((counter > waittime) || (loadStatus == WebBrowserReadyState.Uninitialized) || (loadStatus == WebBrowserReadyState.Loading) || (loadStatus == WebBrowserReadyState.Interactive))
{
break;
}
counter++;
}
counter = 0;
while (true)
{
loadStatus = webBrControl.ReadyState;
Application.DoEvents();
if (loadStatus == WebBrowserReadyState.Complete && webBrControl.IsBusy != true)
{
break;
}
counter++;
}
}
您可以使用作為 ac# 對象的 webbrowser 對象,它的作用類似於瀏覽器並運行 javascript 代碼,並在收到響應后使用敏捷包解析它。
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