如何使用PhantomJS提交表格

Question

我正在尝试使用phantomJS(这是一个很棒的工具btw!)为我有登录凭据的页面提交表单,然后将目标页面的内容输出到stdout.我能够使用幻像访问表单并成功设置其值,但我不太确定提交表单和输出后续页面内容的正确语法.到目前为止我所拥有的是:

var page = new WebPage();
var url = phantom.args[0];

page.open(url, function (status) {

  if (status !== 'success') {
      console.log('Unable to access network');
  } else {

    console.log(page.evaluate(function () {

      var arr = document.getElementsByClassName("login-form");
      var i;

      for (i=0; i < arr.length; i++) {

        if (arr[i].getAttribute('method') == "POST") {
          arr[i].elements["email"].value="mylogin@somedomain.com";
          arr[i].elements["password"].value="mypassword";

          // This part doesn't seem to work. It returns the content
          // of the current page, not the content of the page after 
          // the submit has been executed. Am I correctly instrumenting
          // the submit in Phantom?
          arr[i].submit();
          return document.querySelectorAll('html')[0].outerHTML;
        }

      }

      return "failed :-(";

    }));
  }

  phantom.exit();
}

Answer 1

我想到了.基本上这是一个异步问题.您不能只提交并期望立即呈现后续页面.您必须等到触发下一页的onLoad事件.我的代码如下:

var page = new WebPage(), testindex = 0, loadInProgress = false;

page.onConsoleMessage = function(msg) {
  console.log(msg);
};

page.onLoadStarted = function() {
  loadInProgress = true;
  console.log("load started");
};

page.onLoadFinished = function() {
  loadInProgress = false;
  console.log("load finished");
};

var steps = [
  function() {
    //Load Login Page
    page.open("https://website.com/theformpage/");
  },
  function() {
    //Enter Credentials
    page.evaluate(function() {

      var arr = document.getElementsByClassName("login-form");
      var i;

      for (i=0; i < arr.length; i++) { 
        if (arr[i].getAttribute('method') == "POST") {

          arr[i].elements["email"].value="mylogin";
          arr[i].elements["password"].value="mypassword";
          return;
        }
      }
    });
  }, 
  function() {
    //Login
    page.evaluate(function() {
      var arr = document.getElementsByClassName("login-form");
      var i;

      for (i=0; i < arr.length; i++) {
        if (arr[i].getAttribute('method') == "POST") {
          arr[i].submit();
          return;
        }
      }

    });
  }, 
  function() {
    // Output content of page to stdout after form has been submitted
    page.evaluate(function() {
      console.log(document.querySelectorAll('html')[0].outerHTML);
    });
  }
];


interval = setInterval(function() {
  if (!loadInProgress && typeof steps[testindex] == "function") {
    console.log("step " + (testindex + 1));
    steps[testindex]();
    testindex++;
  }
  if (typeof steps[testindex] != "function") {
    console.log("test complete!");
    phantom.exit();
  }
}, 50);

Answer 2

此外,CasperJS为PhantomJS中的导航提供了一个很好的高级界面,包括点击链接和填写表格.

CasperJS

更新以添加比较PhantomJS和CasperJS的2015年7月28日文章.

(感谢M先生的评论者!)

Answer 3

发送原始POST请求有时可能更方便.您可以在下面看到PhantomJS的post.js原始示例

// Example using HTTP POST operation

var page = require('webpage').create(),
    server = 'http://posttestserver.com/post.php?dump',
    data = 'universe=expanding&answer=42';

page.open(server, 'post', data, function (status) {
    if (status !== 'success') {
        console.log('Unable to post!');
    } else {
        console.log(page.content);
    }
    phantom.exit();
});

Answer 4

如上所述,CasperJS是填写和发送表单的最佳工具.有关如何使用fill()函数填充和提交表单的最简单示例:

casper.start("http://example.com/login", function() {
//searches and fills the form with id="loginForm"
  this.fill('form#loginForm', {
    'login':    'admin',
    'password':    '12345678'
   }, true);
  this.evaluate(function(){
    //trigger click event on submit button
    document.querySelector('input[type="submit"]').click();
  });
});