在PhantomJS/CasperJS中回发

我正在尝试在aspx中抓取一个网站，该网站有一个js dopostBack按钮。其中一个按钮是回复我的页面的可打印视图，另一个按钮将.csv文件推送给客户端。

我在这里看到一个问题，它描述了csv下载问题，但没有回答它：使用javascript链接下载PhantomJS浏览器

所以我专注于尝试在 phantomJs 中获取可打印视图，因为它看起来更简单（它显示在浏览器窗口中，一定有办法！

按钮代码 ：

<a id="ctl00_ctl00_ctl00_MainContentPlaceHolder_PrintResultsLinkButton" 
  title="Print Results" class="btn-blue"     
  href="javascript:
    __doPostBack('ctl00$ctl00$ctl00$MainContentPlaceHolder$PrintResultsLinkButton','')
">
    <span>Print Results</span>
</a> 

我可以单击带有幻影/卡斯珀的链接，但它似乎不起作用。我认为必须在单击按钮时发送请求，其中包含所有标题，但我无法弄清楚如何接收答案。帮助？

我的卡斯珀代码，工作到我应该得到结果页面的程度：https://gist.github.com/xShirase/7156131

我也尝试评估了 js 函数，它在 chrome 控制台中工作，但仍然没有给我幻影中的结果......

迄今为止的最后一次尝试：我第一次加载我的页面，以获取cookie和隐藏输入的值，然后尝试自己发布请求。捕获中的输出仍然相同，所以我知道我的请求没问题，但为什么我没有得到正确的结果？

法典：

casper.start();
capture = function(){
    var url = 'http://www.cms.gov/apps/physician-fee-schedule/search/search-criteria.aspx';
    casper.open(url).thenClick('a.btn',function() {
     this.then(grabResults);
    });
};
grabResults = function(){
  this.echo(this.getCurrentUrl());
  this.open('http://www.cms.gov/apps/physician-fee-schedule/search/search-results.aspx?Y=0&T=0&HT=2&CT=3&H1=00100&H2=11400&M=5').then(function(){
    this.capture('page.png');
    a = this.evaluate(function(){
        var v = $('input:hidden#__VIEWSTATE').val();
        var d = document.cookie;
        return [v,d];
    });
  });
  this.then(grabPRResults);
};

grabPRResults = function(){
    this.open('http://www.cms.gov/apps/physician-fee-schedule/search/search-results.aspx?Y=0&T=0&HT=2&CT=3&H1=00100&H2=11400&M=5', {
    method: 'post',
    headers: {
        'Host': 'www.cms.gov',
        'Connection': 'keep-alive',
        'Content-Length': '103902',
        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
        'Origin': 'http://www.cms.gov',
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36',
        'Content-Type': 'application/x-www-form-urlencoded',
        'Referer': 'http://www.cms.gov/apps/physician-fee-schedule/search/search-results.aspx?Y=0&T=0&HT=2&CT=3&H1=00100&H2=11400&M=5',
        'Accept-Encoding': 'gzip,deflate,sdch',
        'Accept-Language': 'fr,en-US;q=0.8,en;q=0.6',
        'Cookie': a[1]
      },
    data:   {
        '__EVENTTARGET':'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$PrintResultsLinkButton',
        '__EVENTARGUMENT':'',
        '__LASTFOCUS':'',
        '__VIEWSTATE':a[0],
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$PFSSResultsCPEWrapper_ClientState':'false',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$YearDropDown':'2013',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$TypeOfInfoDropDown':'pi',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$HCPCTypeDropDown':'range',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$CarrierTypeDropDown':'all',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$HCPC1Textbox':'00100',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$HCPC2Textbox':'11400',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$HCPC3Textbox':'',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$HCPC4Textbox':'',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$HCPC5Textbox':'',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$ModifierDropDown':'%',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$CarrierDropDown':'default',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$CarrierLocalityDropDown':'default',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$ResultsControl1$PFSSGridView$ctl01$ tbGotoPage':'',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$ResultsControl1$PFSSGridView$ctl01$PFSSGridViewtopddlTopPageSize':'10',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$ResultsControl1$PFSSGridView$ctl14$ tbGotoPageBottom':'',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$ResultsControl1$PFSSGridView$ctl14$PFSSGridViewbottomddlBottomPageSize':'10',
        'ctl00$ctl00$ctl00$CMSGMainContentPlaceHolder$ToolContentPlaceHolder$PFSSContentPlaceHolder$DownloadsWidget1$DownloadsCPEWrapper_ClientState':'false'
    }
  }).then(function(){
    this.wait(25000);
    this.then(lest);
  });
};
lest= function(){
  this.capture('ppp.png');
};
casper.then(capture);
casper.run();