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Javascript 幻影不在等待”；全称；页面加载

javascript events phantomjs

Javascript 幻影不在等待”；全称；页面加载,javascript,events,phantomjs,Javascript,Events,Phantomjs,我正在使用v1.4.1加载一些网页。我没有访问他们服务器端的权限，我只是得到指向他们的链接。我正在使用Phantom的过时版本，因为我需要在该网页上支持Adobe Flash 问题是许多网站都在异步加载次要内容，这就是为什么Phantom的onLoadFinished回调（类似于HTML中的onLoad）在并非所有内容都已加载的情况下过早启动的原因。有谁能建议我如何等待网页满负荷，例如，制作一个包含所有动态内容（如广告）的屏幕截图吗？也许您可以使用来检测异步加载。下面是使用这些回调的示例： 此外

我正在使用v1.4.1加载一些网页。我没有访问他们服务器端的权限，我只是得到指向他们的链接。我正在使用Phantom的过时版本，因为我需要在该网页上支持Adobe Flash

问题是许多网站都在异步加载次要内容，这就是为什么Phantom的onLoadFinished回调（类似于HTML中的onLoad）在并非所有内容都已加载的情况下过早启动的原因。有谁能建议我如何等待网页满负荷，例如，制作一个包含所有动态内容（如广告）的屏幕截图吗？

也许您可以使用来检测异步加载。下面是使用这些回调的示例：

此外，您还可以查看
示例/netsniff.js
以获得一个工作示例。

您可以尝试waitfor和光栅化示例的组合：

/**
 * See https://github.com/ariya/phantomjs/blob/master/examples/waitfor.js
 * 
 * Wait until the test condition is true or a timeout occurs. Useful for waiting
 * on a server response or for a ui change (fadeIn, etc.) to occur.
 *
 * @param testFx javascript condition that evaluates to a boolean,
 * it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
 * as a callback function.
 * @param onReady what to do when testFx condition is fulfilled,
 * it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
 * as a callback function.
 * @param timeOutMillis the max amount of time to wait. If not specified, 3 sec is used.
 */
function waitFor(testFx, onReady, timeOutMillis) {
    var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3000, //< Default Max Timout is 3s
        start = new Date().getTime(),
        condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()), //< defensive code
        interval = setInterval(function() {
            if ( (new Date().getTime() - start < maxtimeOutMillis) && !condition ) {
                // If not time-out yet and condition not yet fulfilled
                condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()); //< defensive code
            } else {
                if(!condition) {
                    // If condition still not fulfilled (timeout but condition is 'false')
                    console.log("'waitFor()' timeout");
                    phantom.exit(1);
                } else {
                    // Condition fulfilled (timeout and/or condition is 'true')
                    console.log("'waitFor()' finished in " + (new Date().getTime() - start) + "ms.");
                    typeof(onReady) === "string" ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condition is fulfilled
                    clearInterval(interval); //< Stop this interval
                }
            }
        }, 250); //< repeat check every 250ms
};

var page = require('webpage').create(), system = require('system'), address, output, size;

if (system.args.length < 3 || system.args.length > 5) {
    console.log('Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom]');
    console.log('  paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
    phantom.exit(1);
} else {
    address = system.args[1];
    output = system.args[2];
    if (system.args.length > 3 && system.args[2].substr(-4) === ".pdf") {
        size = system.args[3].split('*');
        page.paperSize = size.length === 2 ? {
            width : size[0],
            height : size[1],
            margin : '0px'
        } : {
            format : system.args[3],
            orientation : 'portrait',
            margin : {
                left : "5mm",
                top : "8mm",
                right : "5mm",
                bottom : "9mm"
            }
        };
    }
    if (system.args.length > 4) {
        page.zoomFactor = system.args[4];
    }
    var resources = [];
    page.onResourceRequested = function(request) {
        resources[request.id] = request.stage;
    };
    page.onResourceReceived = function(response) {
        resources[response.id] = response.stage;
    };
    page.open(address, function(status) {
        if (status !== 'success') {
            console.log('Unable to load the address!');
            phantom.exit();
        } else {
            waitFor(function() {
                // Check in the page if a specific element is now visible
                for ( var i = 1; i < resources.length; ++i) {
                    if (resources[i] != 'end') {
                        return false;
                    }
                }
                return true;
            }, function() {
               page.render(output);
               phantom.exit();
            }, 10000);
        }
    });
}

/**
*看https://github.com/ariya/phantomjs/blob/master/examples/waitfor.js
* 
*等待测试条件为真或出现超时。等待有用
*在服务器响应或发生ui更改（fadeIn等）时。
*
*@param testFx计算为布尔值的javascript条件，
*它可以作为字符串传入（例如：“1==1”或“$”（“#bar”）。is（“：visible”）”或
*作为回调函数。
*@param onReady满足testFx条件时该怎么办，
*它可以作为字符串传入（例如：“1==1”或“$”（“#bar”）。is（“：visible”）”或
*作为回调函数。
*@param timeOutMillis是等待的最大时间。如果未指定，则使用3秒。
*/
函数waitFor（testFx、onReady、timeOutMillis）{
var maxtimeOutMillis=timeOutMillis？timeOutMillis:3000，//<默认最大超时为3s
开始=新日期（）.getTime（），
条件=（typeof（testFx）==“string”？eval（testFx）：testFx（）），//<
间隔=设置间隔（函数（）{
如果（（新日期（）.getTime（）-start5）{
log（'用法：rasterize.js URL文件名[paperwidth*paperheight | paperformat][zoom]）；
log（'paper（pdf输出）示例：“5in*7.5in”，“10cm*20cm”，“A4”，“Letter”）；
幻影。出口（1）；
}否则{
地址=system.args[1]；
输出=系统参数[2]；
if（system.args.length>3&&system.args[2].substr（-4）=“.pdf”）{
size=system.args[3]。拆分（'*'）；
page.paperSize=size.length==2{
宽度：大小[0]，
高度：尺寸[1]，
边距：“0px”
} : {
格式：system.args[3]，
方向：'肖像'，
保证金：{
左：“5mm”，
顶部：“8毫米”，
右：“5mm”，
底部：“9毫米”
}
};
}
如果（system.args.length>4）{
page.zoomFactor=system.args[4]；
}
var资源=[]；
page.onResourceRequested=函数（请求）{
资源[request.id]=request.stage；
};
page.onResourceReceived=函数（响应）{
资源[response.id]=response.stage；
};
第页打开（地址、功能（状态）{
如果（状态！=“成功”）{
console.log（'无法加载地址！'）；
phantom.exit（）；
}否则{
waitFor（函数（）{
//如果特定元素现在可见，请检入页面
对于（变量i=1；i
另一种方法是让PhantomJS在加载页面后等待一段时间，然后再进行渲染，如常规示例所示，但超时时间较长，以允许JavaScript完成加载其他资源：

page.open(address, function (status) {
    if (status !== 'success') {
        console.log('Unable to load the address!');
        phantom.exit();
    } else {
        window.setTimeout(function () {
            page.render(output);
            phantom.exit();
        }, 1000); // Change timeout as required to allow sufficient time 
    }
});
在我的程序中，我使用一些逻辑来判断它是否为onload：观察它的网络请求，如果在过去200毫秒内没有新的请求，我将处理它为onload

在onLoadFinish（）之后使用此选项

函数onLoadComplete（第页，回调）{
var waiting=[]；//请求id
var interval=200；//等待新请求的毫秒时间
var定时器=设置超时（超时，间隔）；
var max_retry=3//
var counter_retry=0；
函数超时（）{
if（waiting.length&&counter\u retrypage.open(address, function (status) {
    if (status !== 'success') {
        console.log('Unable to load the address!');
        phantom.exit();
    } else {
        window.setTimeout(function () {
            page.render(output);
            phantom.exit();
        }, 1000); // Change timeout as required to allow sufficient time 
    }
});

function onLoadComplete(page, callback){
    var waiting = [];  // request id
    var interval = 200;  //ms time waiting new request
    var timer = setTimeout( timeout, interval);
    var max_retry = 3;  //
    var counter_retry = 0;

    function timeout(){
        if(waiting.length && counter_retry < max_retry){
            timer = setTimeout( timeout, interval);
            counter_retry++;
            return;
        }else{
            try{
                callback(null, page);
            }catch(e){}
        }
    }

    //for debug, log time cost
    var tlogger = {};

    bindEvent(page, 'request', function(req){
        waiting.push(req.id);
    });

    bindEvent(page, 'receive', function (res) {
        var cT = res.contentType;
        if(!cT){
            console.log('[contentType] ', cT, ' [url] ', res.url);
        }
        if(!cT) return remove(res.id);
        if(cT.indexOf('application') * cT.indexOf('text') != 0) return remove(res.id);

        if (res.stage === 'start') {
            console.log('!!received start: ', res.id);
            //console.log( JSON.stringify(res) );
            tlogger[res.id] = new Date();
        }else if (res.stage === 'end') {
            console.log('!!received end: ', res.id, (new Date() - tlogger[res.id]) );
            //console.log( JSON.stringify(res) );
            remove(res.id);

            clearTimeout(timer);
            timer = setTimeout(timeout, interval);
        }

    });

    bindEvent(page, 'error', function(err){
        remove(err.id);
        if(waiting.length === 0){
            counter_retry = 0;
        }
    });

    function remove(id){
        var i = waiting.indexOf( id );
        if(i < 0){
            return;
        }else{
            waiting.splice(i,1);
        }
    }

    function bindEvent(page, evt, cb){
        switch(evt){
            case 'request':
                page.onResourceRequested = cb;
                break;
            case 'receive':
                page.onResourceReceived = cb;
                break;
            case 'error':
                page.onResourceError = cb;
                break;
            case 'timeout':
                page.onResourceTimeout = cb;
                break;
        }
    }
}

page.onConsoleMessage(function(msg) {
  // do something e.g. page.render
});

<script>
  window.onload = function(){
    console.log('page loaded');
  }
</script>

phantom = require('phantom');

var fullLoad = function(anUrl, callbackDone) {
    phantom.create(function (ph) {
        ph.createPage(function (page) {
            page.open(anUrl, function (status) {
                if (status !== 'success') {
                    console.error("pahtom: error opening " + anUrl, status);
                    ph.exit();
                } else {
                    // timeOut
                    global.setTimeout(function () {
                        page.evaluate(function () {
                            return document.documentElement.innerHTML;
                        }, function (result) {
                            ph.exit(); // EXTREMLY IMPORTANT
                            callbackDone(result); // callback
                        });
                    }, 5000);
                }
            });
        });
    });
}

var callback = function(htmlBody) {
    // do smth with the htmlBody
}

fullLoad('your/url/', callback);

var waitResponseInterval = 500
var reqResInterval = null
var reqResFinished = false
var resetTimeout = function() {}

 resetTimeout = function() {
     if(reqResInterval)
         clearTimeout(reqResInterval)

     reqResInterval = setTimeout(function(){
         reqResFinished = true
         page.onLoadFinished("success")
     },waitResponseInterval)
 }
 resetTimeout()

 resetTimeout()

 if(!reqResFinished)
 {
      return
 }
 reqResFinished = false

// load the module
var webpage = require('webpage');
// get timestamp
function getTimestamp(){
    // or use Date.now()
    return new Date().getTime();
}

var lastTimestamp = getTimestamp();

var page = webpage.create();
page.onResourceRequested = function(request) {
    // update the timestamp when there is a request
    lastTimestamp = getTimestamp();
};
page.onResourceReceived = function(response) {
    // update the timestamp when there is a response
    lastTimestamp = getTimestamp();
};

page.open(html, function(status) {
    if (status !== 'success') {
        // exit if it fails to load the page
        phantom.exit(1);
    }
    else{
        // do something here
    }
});

function checkReadyState() {
    setTimeout(function () {
        var curentTimestamp = getTimestamp();
        if(curentTimestamp-lastTimestamp>1000){
            // exit if there isn't request or response in 1000ms
            phantom.exit();
        }
        else{
            checkReadyState();
        }
    }, 100);
}

checkReadyState();

var system = require('system');
var page = require('webpage').create();

page.open('http://....', function(){
      console.log(page.content);
      var k = 0;

      var loop = setInterval(function(){
          var qrcode = page.evaluate(function(s) {
             return document.querySelector(s).src;
          }, '.qrcode img');

          k++;
          if (qrcode){
             console.log('dataURI:', qrcode);
             clearInterval(loop);
             phantom.exit();
          }

          if (k === 50) phantom.exit(); // 10 sec timeout
      }, 200);
  });

var system = require('system');
var webPage = require('webpage');

var page = webPage.create();
var url = system.args[1];

page.viewportSize = {
  width: 1280,
  height: 720
};

var requestsArray = [];

page.onResourceRequested = function(requestData, networkRequest) {
  requestsArray.push(requestData.id);
};

page.onResourceReceived = function(response) {
  var index = requestsArray.indexOf(response.id);
  if (index > -1 && response.stage === 'end') {
    requestsArray.splice(index, 1);
  }
};

page.open(url, function(status) {

  var interval = setInterval(function () {

    if (requestsArray.length === 0) {

      clearInterval(interval);
      var content = page.content;
      console.log(content);
      page.render('yourLoadedPage.png');
      phantom.exit();
    }
  }, 500);
});

'use strict';

var wasSuccessful = phantom.injectJs('./lib/waitFor.js');
var page = require('webpage').create();

page.open('http://foo.com', function(status) {
  if (status === 'success') {
    page.includeJs('https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js', function() {
      waitFor(function() {
        return page.evaluate(function() {
          if ('complete' === document.readyState) {
            return true;
          }

          return false;
        });
      }, function() {
        var fooText = page.evaluate(function() {
          return $('#foo').text();
        });

        phantom.exit();
      });
    });
  } else {
    console.log('error');
    phantom.exit(1);
  }
});

function waitFor(testFx, onReady, timeOutMillis) {
    var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3000, //< Default Max Timout is 3s
        start = new Date().getTime(),
        condition = false,
        interval = setInterval(function() {
            if ( (new Date().getTime() - start < maxtimeOutMillis) && !condition ) {
                // If not time-out yet and condition not yet fulfilled
                condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()); //< defensive code
            } else {
                if(!condition) {
                    // If condition still not fulfilled (timeout but condition is 'false')
                    console.log("'waitFor()' timeout");
                    phantom.exit(1);
                } else {
                    // Condition fulfilled (timeout and/or condition is 'true')
                    // console.log("'waitFor()' finished in " + (new Date().getTime() - start) + "ms.");
                    typeof(onReady) === "string" ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condi>
                    clearInterval(interval); //< Stop this interval
                }
            }
        }, 250); //< repeat check every 250ms
}

page.onConsoleMessage = function(msg, lineNum, sourceId) {

    if(msg=='hey lets take screenshot')
    {
        window.setInterval(function(){      
            try
            {               
                 var sta= page.evaluateJavaScript("function(){ return jQuery.active;}");                     
                 if(sta == 0)
                 {      
                    window.setTimeout(function(){
                        page.render('test.png');
                        clearInterval();
                        phantom.exit();
                    },1000);
                 }
            }
            catch(error)
            {
                console.log(error);
                phantom.exit(1);
            }
       },1000);
    }       
};


page.open(address, function (status) {      
    if (status !== "success") {
        console.log('Unable to load url');
        phantom.exit();
    } else { 
       page.setContent(page.content.replace('</body>','<script>window.onload = function(){console.log(\'hey lets take screenshot\');}</script></body>'), address);
    }
});

 page.sendEvent('click',200, 660);

do { phantom.page.sendEvent('mousemove'); } while (page.loading);

page.evaluate(function () {
document.getElementsByClassName('btn btn-primary btn-block')[0].click();
});
do { phantom.page.sendEvent('mousemove'); } while (page.evaluate(function()
{
return document.location != "https://www.bestwaywholesale.co.uk/";
}));
do { phantom.page.sendEvent('mousemove'); } while (page.loading);