如何在继续之前等待click()事件加载到phantomjs中？

Question

Phantomjs有这两个非常方便的回调onLoadStarted,onLoadFinished它允许你在页面加载时基本上暂停执行.但我一直在搜索,如果你click()提交按钮或超链接,我找不到相应的.发生了类似的页面加载,但onLoadStarted我没有调用此事件,因为没有明确的page.open()发生.我正试图找出一种干净的方法来暂停执行此负载.

一个解决方案显然是嵌套的setTimeout,但我想避免这种情况,因为它是hacky并依赖于试验和错误而不是可靠和更强大的东西,如测试某事或等待事件.

我错过了这种页面加载的特定回调吗？或者也许有某种通用的代码模式可以处理这种事情？

编辑:

我还没弄明白如何让它暂停.这是onLoadStarted()我调用click()命令时不调用该函数的代码:

var loadInProgress = false;

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

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

page.open(loginPage.url, function (status) {
    if (status !== 'success') {
        console.log('Unable to access network');
        fs.write(filePath + errorState, 1, 'w');
        phantom.exit();
    } else {
        page.evaluate(function (loginPage, credentials) {
            console.log('inside loginPage evaluate function...\n')
            document.querySelector('input[id=' + loginPage.userId + ']').value = credentials.username;
            document.querySelector('input[id=' + loginPage.passId + ']').value = credentials.password;      
            document.querySelector('input[id=' + loginPage.submitId + ']').click();
            //var aTags = document.getElementsByTagName('a')
            //aTags[1].click();
        }, loginPage, credentials);

        page.render(renderPath + 'postLogin.png');
        console.log('rendered post-login');

我仔细检查了id是否正确.在page.render()将显示该信息被提交,但只有当我把它放在一个的setTimeout(),否则它会立即呈现它,我只看到凭证输入,页面重定向之前.也许我错过了别的什么？

Answer 1

我认为这些onLoadStarted和onLoadFinished功能都是你需要的.以下面的脚本为例:

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

page.onResourceReceived = function(response) {
    if (response.stage !== "end") return;
    console.log('Response (#' + response.id + ', stage "' + response.stage + '"): ' + response.url);
};
page.onResourceRequested = function(requestData, networkRequest) {
    console.log('Request (#' + requestData.id + '): ' + requestData.url);
};
page.onUrlChanged = function(targetUrl) {
    console.log('New URL: ' + targetUrl);
};
page.onLoadFinished = function(status) {
    console.log('Load Finished: ' + status);
};
page.onLoadStarted = function() {
    console.log('Load Started');
};
page.onNavigationRequested = function(url, type, willNavigate, main) {
    console.log('Trying to navigate to: ' + url);
};

page.open("http://example.com", function(status){
    page.evaluate(function(){
        // click
        var e = document.createEvent('MouseEvents');
        e.initMouseEvent('click', true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
        document.querySelector("a").dispatchEvent(e);
    });
    setTimeout(function(){
        phantom.exit();
    }, 10000);
});

它打印

Trying to navigate to: http://example.com/
Request (#1): http://example.com/
Load Started
New URL: http://example.com/
Response (#1, stage "end"): http://example.com/
Load Finished: success
Trying to navigate to: http://www.iana.org/domains/example
Request (#2): http://www.iana.org/domains/example
Load Started
Trying to navigate to: http://www.iana.org/domains/reserved
Request (#3): http://www.iana.org/domains/reserved
Response (#2, stage "end"): http://www.iana.org/domains/example
New URL: http://www.iana.org/domains/reserved
Request (#4): http://www.iana.org/_css/2013.1/screen.css
Request (#5): http://www.iana.org/_js/2013.1/jquery.js
Request (#6): http://www.iana.org/_js/2013.1/iana.js
Response (#3, stage "end"): http://www.iana.org/domains/reserved
Response (#6, stage "end"): http://www.iana.org/_js/2013.1/iana.js
Response (#4, stage "end"): http://www.iana.org/_css/2013.1/screen.css
Response (#5, stage "end"): http://www.iana.org/_js/2013.1/jquery.js
Request (#7): http://www.iana.org/_img/2013.1/iana-logo-header.svg
Request (#8): http://www.iana.org/_img/2013.1/icann-logo.svg
Response (#8, stage "end"): http://www.iana.org/_img/2013.1/icann-logo.svg
Response (#7, stage "end"): http://www.iana.org/_img/2013.1/iana-logo-header.svg
Request (#9): http://www.iana.org/_css/2013.1/print.css
Response (#9, stage "end"): http://www.iana.org/_css/2013.1/print.css
Load Finished: success

它显示单击链接会发出一次LoadStarted事件和两次NavigationRequested事件,因为存在重定向.诀窍是在执行操作之前添加事件处理程序:

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

page.open("http://example.com", function(status){
    page.onLoadFinished = function(status) {
        console.log('Load Finished: ' + status);
        page.render("test37_next_page.png");
        phantom.exit();
    };
    page.onLoadStarted = function() {
        console.log('Load Started');
    };

    page.evaluate(function(){
        var e = document.createEvent('MouseEvents');
        e.initMouseEvent('click', true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
        document.querySelector("a").dispatchEvent(e);
    });
});

如果您需要做这些事情,也许是时候尝试像CasperJS这样的东西.它运行在PhantomJS之上,但有一个更好的API用于浏览网页.

Answer 2

使用高级包装器,nightmarejs.你可以轻松地click在那里等待.

这是代码(示例部分):

var Nightmare = require('nightmare');
new Nightmare()
  .goto('http://yahoo.com')
    .type('input[title="Search"]', 'github nightmare')
    .click('.searchsubmit')
    .run(function (err, nightmare) {
      if (err) return console.log(err);
      console.log('Done!');
    });

可以在github上找到更多示例和API用法