phontomjs webPage模块方法

2024-05-07 02:08
文章标签 模块 方法 webpage phontomjs

本文主要是介绍phontomjs webPage模块方法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

随时随地技术实战干货，获取项目源码、学习资料，请关注源代码社区公众号(ydmsq666)

addCookie

addCookie(Cookie) {boolean}

Introduced: PhantomJS 1.7

Add a Cookie to the page. If the domain does not match the current page, the Cookie will be ignored/rejected. Returns true if successfully added, otherwise false.

Examples

var webPage = require('webpage');
var page = webPage.create();phantom.addCookie({'name'     : 'Valid-Cookie-Name',   /* required property */'value'    : 'Valid-Cookie-Value',  /* required property */'domain'   : 'localhost','path'     : '/foo',                /* required property */'httponly' : true,'secure'   : false,'expires'  : (new Date()).getTime() + (1000 * 60 * 60)   /* <-- expires in 1 hour */

childFramesCount

Deprecated.

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.childFramesCount example.

childFramesName

Deprecated.

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.childFramesName example.

clearCookies

clearCookies() {void}

Introduced: PhantomJS 1.7

Delete all Cookies visible to the current URL.

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.clearCookies example.

close

close() {void}

Introduced: PhantomJS 1.7

Close the page and releases the memory heap associated with it. Do not use the page instance after calling this.

Due to some technical limitations, the web page object might not be completely garbage collected. This is often encountered when the same object is used over and over again. Calling this function may stop the increasing heap allocation.

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.close example.

currentFrameName

Deprecated.

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.currentFrameName example.

deleteCookie

deleteCookie(cookieName) {boolean}

Introduced: PhantomJS 1.7

Delete any Cookies visible to the current URL with a ‘name’ property matching cookieName. Returns true if successfully deleted, otherwise false.

Examples

var webPage = require('webpage');
var page = webPage.create();page.deleteCookie('Added-Cookie-Name');

evaluateAsync

evaluateAsync(function, [delayMillis, arg1, arg2, ...]) {void}

Evaluates the given function in the context of the web page, without blocking the current execution. The function returns immediately and there is no return value. This is useful to run some script asynchronously.

The second argument indicates the time (in milliseconds) before the function should execute. The remaining arguments are passed to the function, as with evaluate. You must specify a delay (which can be 0) if you want to pass in any arguments.

Examples

Asynchronous AJAX

var webPage = require('webpage');
var page = webPage.create();page.open("", function(status) {page.includeJs("http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js", function() {page.evaluateAsync(function() {$.ajax({url: "api1", success: function() {}});});page.evaluateAsync(function(apiUrl) {$.ajax({url: apiUrl, success: function() {}});}, 1000, "api2");});
});

evaluateJavaScript

evaluateJavaScript(str)

Evaluate a function contained in a string.

evaluateJavaScript evaluates the function defined in the string in the context of the web page. It is similar to evaluate.

Examples

Set a variable and log it from the web page

This example passes a constant value from phantomjs to the window object in the context of the web page, and then logs that value.

var webPage = require('webpage');
var page = webPage.create();page.onConsoleMessage = function(msg) {console.log('The web page said: ' + msg);
};page.open('http://phantomjs.org/', function(status) {var script1 = "function(){ window.phantomVar='phantomjs made me do it!'; }";var script2 = "function(){ console.log(window.phantomVar); }";page.evaluateJavaScript(script1);page.evaluateJavaScript(script2);phantom.exit();
});

Notice that str must contain the text of a function declaration. The declared function is invoked immediately.

If you try to use it simply to define a variable like this. it won’t work.

  page.evaluateJavaScript("window.phantomVar='phantomjs made me do it!';"); /*wrong*/

If you try this you’ll get an error message like this:

SyntaxError: Expected token ')'phantomjs://webpage.evaluate():1 in evaluateJavaScript

Extract the phantomjs.org website’s logo url

var webPage = require('webpage');
var page = webPage.create();page.onConsoleMessage = function(msg) {console.log('CONSOLE: ' + msg);
};page.open('http://phantomjs.org/', function(status) {var logoUrl = page.evaluateJavaScript('function(){return document.body.querySelector("img").src;}');console.log(logoUrl); // http://phantomjs.org/img/phantomjs-logo.pngphantom.exit();});

evaluate

evaluate(function, arg1, arg2, ...) {object}

Evaluates the given function in the context of the web page. The execution is sandboxed, the web page has no access to the phantom object and it can’t probe its own setting.

Examples

Get the page title from Bing.com (1)

var webPage = require('webpage');
var page = webPage.create();page.open('http://m.bing.com', function(status) {var title = page.evaluate(function() {return document.title;});console.log(title);phantom.exit();});

Get the page title from Bing.com (2)

As of PhantomJS 1.6, JSON-serializable arguments can be passed to the function. In the following example, the text value of a DOM element is extracted.

The following example achieves the same end goal as the previous example but the element is chosen based on a selector which is passed to the evaluate call:

page.open('http://m.bing.com', function(status) {var title = page.evaluate(function(s) {return document.querySelector(s).innerText;}, 'title');console.log(title);phantom.exit();});

Note: The arguments and the return value to the evaluate function must be a simple primitive object. The rule of thumb: if it can be serialized via JSON, then it is fine.

Closures, functions, DOM nodes, etc. will not work!

Any console message from a web page, including from the code inside evaluate, will not be displayed by default. To override this behavior, use the onConsoleMessage callback. The first example can be rewritten to:

Get the page title from Bing.com and print it inside evaluate

var webPage = require('webpage');
var page = webPage.create();page.onConsoleMessage = function(msg) {console.log(msg);
}page.open('http://m.bing.com', function(status) {page.evaluate(function() {console.log(document.title);});phantom.exit();});

getPage

getPage(windowName)

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.getPage example.

goBack

goBack()

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.goBack example.

goForward

goForward()

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.goForward example.

go

go(index)

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.go example.

includeJs

includeJs(url, callback) {void}

Includes external script from the specified url (usually a remote location) on the page and executes the callback upon completion.

Examples

var webPage = require('webpage');
var page = webPage.create();page.includeJs(// Include the https version, you can change this to http if you like.'https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js',function() {(page.evaluate(function() {// jQuery is loaded, now manipulate the DOMvar $loginForm = $('form#login');$loginForm.find('input[name="username"]').value('phantomjs');$loginForm.find('input[name="password"]').value('c45p3r');}))}
);

injectJs

injectJs(filename) {boolean}

Injects external script code from the specified file into the page (like page.includeJs, except that the file does not need to be accessible from the hosted page).

If the file cannot be found in the current directory, libraryPath is used for additional look up.

This function returns true if injection is successful, otherwise it returns false.

Examples

Inject do.js file into phantomjs.org page

var webPage = require('webpage');
var page = webPage.create();page.open('http://www.phantomjs.org', function(status) {if (status === "success") {page.includeJs('http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js', function() {if (page.injectJs('do.js')) {var title = page.evaluate(function() {// returnTitle is a function loaded from our do.js file - see belowreturn returnTitle();});console.log(title);phantom.exit();}});}
});

Where do.js is simply:

window.returnTitle = function() {return document.title;
};

The console log will be:

"PhantomJS | PhantomJS"

Note: The arguments and the return value to the evaluate function must be a simple primitive object. The rule of thumb: if it can be serialized via JSON, then it is fine.

Closures, functions, DOM nodes, etc. will not work!

openUrl

openUrl(url, httpConf, settings)

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.openUrl example.

open

open(url, callback) {void}

open(url, method, callback) {void}

open(url, method, data, callback) {void}

open(url, settings, callback) {void}

Opens the url and loads it to the page. Once the page is loaded, the optional callbackis called using page.onLoadFinished, with the page status ('success' or 'fail') provided to it.

Examples

GET google.com and report “success” or “fail”

var webPage = require('webpage');
var page = webPage.create();page.open('http://www.google.com/', function(status) {console.log('Status: ' + status);// Do other things here...
});

POST data to google.com and report “success” or “fail”

As of PhantomJS 1.2, the open function can be used to request a URL with methods other than GET. This syntax also includes the ability to specify data to be sent with the request. In the following example, we make a request using the POST method, and include some basic data.

var webPage = require('webpage');
var page = webPage.create();
var postBody = 'user=username&password=password';page.open('http://www.google.com/', 'POST', postBody, function(status) {console.log('Status: ' + status);// Do other things here...
});

POST json data to your.custom.api in utf-8 encoding

As of PhantomJS 1.9, the open function can get an object of settings. and with a use of “encoding” key, you can set the custom encoding to your app. In this example, we’ve set the encoding to UTF8, and set the Content-Type header to application/json for making our server know the request has information in json format and not in urlencoded format.

var webPage = require('webpage');
var page = webPage.create();
var settings = {operation: "POST",encoding: "utf8",headers: {"Content-Type": "application/json"},data: JSON.stringify({some: "data",another: ["custom", "data"]})
};page.open('http://your.custom.api', settings, function(status) {console.log('Status: ' + status);// Do other things here...
});

release

release() {void}

Stability: DEPRECATED - Use page.close

Releases memory heap associated with this page. Do not use the page instance after calling this.

Due to some technical limitations, the web page object might not be completely garbage collected. This is often encountered when the same object is used over and over again. Calling this function may stop the increasing heap allocation.

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.release example.

reload

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.reload example.

renderBase64

renderBase64(format)

Renders the web page to an image buffer and returns the result as a Base64-encoded string representation of that image.

Supported formats

  • PNG
  • GIF
  • JPEG

Examples

var webPage = require('webpage');
var page = webPage.create();page.viewportSize = {width: 1920,height: 1080
};page.open('http://phantomjs.org', function (status) {var base64 = page.renderBase64('PNG');console.log(base64);phantom.exit();
});

renderBuffer

renderBuffer(format, quality)

Renders the web page to an image buffer which can be sent directly to a client (e.g. using the webserver module)

Supported formats

  • PNG
  • GIF
  • JPEG

Examples

var server = require('webserver').create();var listening = server.listen(8001, function(request, response) {var url = "http://phantomjs.org", format = 'png', quality = -1;var page = require('webpage').create();page.viewportSize = {width: 800,height: 600};page.open(url, function start(status) {// Buffer is an Uint8ClampedArrayvar buffer = page.renderBuffer(format, quality);response.statusCode = 200;response.headers = {"Cache": "no-cache","Content-Type": "image/" + format};page.close();// Pass the Buffer to 'write' to send the Uint8ClampedArray to the clientresponse.write(buffer);response.close();});});

render

render(filename [, {format, quality}]) {void}

Renders the web page to an image buffer and saves it as the specified filename.

Currently, the output format is automatically set based on the file extension.

Supported formats

  • PDF
  • PNG
  • JPEG
  • BMP
  • PPM
  • GIF support depends on the build of Qt used

Quality

An integer between 0 and 100.

The quality setting only has an effect on jpeg and png formats. With jpeg, it sets the quality level as a percentage, in the same way as most image editors. (The output file always has 2x2 subsampling.) A level of 0 produces a very small, very low quality file, and 100 produces a much larger, high-quality file. The default level is 75. With png, it sets the lossless (Deflate) compression level, with 0 producing the smallest files, and 100 producing the largest. However, the files look identical, and are always true-colour.

Examples

var webPage = require('webpage');
var page = webPage.create();page.viewportSize = { width: 1920, height: 1080 };
page.open("http://www.google.com", function start(status) {page.render('google_home.jpeg', {format: 'jpeg', quality: '100'});phantom.exit();
});

More information

The image generation code (except for PDF output) uses QImage from the Qt framework, documented at http://doc.qt.io/qt-5/qimage.html#save.

sendEvent

Sends an event to the web page.

1.7 implementation source.

The events are not synthetic DOM events, each event is sent to the web page as if it comes as part of user interaction.

Mouse events

sendEvent(mouseEventType[, mouseX, mouseY, button='left'])

The first argument is the event type. Supported types are 'mouseup', 'mousedown', 'mousemove', 'doubleclick' and 'click'. The next two arguments are optional but represent the mouse position for the event.

The button parameter (defaults to left) specifies the button to push.

For 'mousemove', however, there is no button pressed (i.e. it is not dragging).

Keyboard events

sendEvent(keyboardEventType, keyOrKeys, [null, null, modifier])

The first argument is the event type. The supported types are: keyup, keypress and keydown. The second parameter is a key (from page.event.key), or a string.

You can also indicate a fifth argument, which is an integer indicating the modifier key.

  • 0: No modifier key is pressed
  • 0x02000000: A Shift key on the keyboard is pressed
  • 0x04000000: A Ctrl key on the keyboard is pressed
  • 0x08000000: An Alt key on the keyboard is pressed
  • 0x10000000: A Meta key on the keyboard is pressed
  • 0x20000000: A keypad button is pressed

Third and fourth argument are not taken account for keyboard events. Just give null for them.

Examples

Simulate a shift+alt+A keyboard combination

var webPage = require('webpage');
var page = webPage.create();page.sendEvent('keypress', page.event.key.A, null, null, 0x02000000 |

setContent

Introduced: PhantomJS 1.8

Allows to set both page.content and page.url properties.

The webpage will be reloaded with the new content and the current location set as the given url, without any actual http request being made.

Examples

var webPage = require('webpage');
var page = webPage.create();
var expectedContent = '<html><body><div>Test div</div></body></html>';
var expectedLocation = 'http://www.phantomjs.org/';
page.setContent(expectedContent, expectedLocation);

stop

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.stop example.

switchToChildFrame

switchToChildFrame(frameName) or switchToChildFrame(framePosition)

Deprecated.

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.switchToChildFrame example.

switchToFocusedFrame

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.switchToFocusedFrame example.

switchToFrame

if the page have othe frame, you can use switchToFrame(frameName) or switchToFrame(framePosition) to exchange it.Other similar methods are switchToChildFrame(),switchToFocusedFrame,switchToMainFrame and switchToParentFrame

Examples

var webPage = require('webpage');
var page = webPage.create();
page.open('http://www.sample.com',function(status){if(status!== 'success'){console.log('Unable to access network');}else{page.switchToFrame('framwName/framwPosition');console.log(page.frameContent);phantom.exit();}
});

switchToMainFrame

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.switchToMainFrame example.

switchToParentFrame

Examples

var webPage = require('webpage');
var page = webPage.create();
// @TODO: Finish page.switchToParentFrame example.

uploadFile

uploadFile(selector, filename)

Uploads the specified file (filename) to the form element associated with the selector.

This function is used to automate the upload of a file, which is usually handled with a file dialog in a traditional browser. Since there is no dialog in this headless mode, such an upload mechanism is handled via this special function instead.

Examples

var webPage = require('webpage');
var page = webPage.create();page.uploadFile('input[name=image]', '/path/to/some/photo.jpg');

这篇关于phontomjs webPage模块方法的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！


http://www.chinasem.cn/article/966032。

相关文章

检查 Nginx 是否启动的几种方法

检查 Nginx 是否启动的几种方法

《检查Nginx是否启动的几种方法》本文主要介绍了检查Nginx是否启动的几种方法,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学... 目录1. 使用 systemctl 命令（推荐）2. 使用 service 命令3. 检查进程是否存在4
阅读更多...
Java方法重载与重写之同名方法的双面魔法(最新整理)

Java方法重载与重写之同名方法的双面魔法(最新整理)

《Java方法重载与重写之同名方法的双面魔法(最新整理)》文章介绍了Java中的方法重载Overloading和方法重写Overriding的区别联系,方法重载是指在同一个类中,允许存在多个方法名相同... 目录Java方法重载与重写：同名方法的双面魔法方法重载（Overloading）：同门师兄弟的不同绝
阅读更多...
MySQL字符串转数值的方法全解析

MySQL字符串转数值的方法全解析

《MySQL字符串转数值的方法全解析》在MySQL开发中,字符串与数值的转换是高频操作,本文从隐式转换原理、显式转换方法、典型场景案例、风险防控四个维度系统梳理,助您精准掌握这一核心技能,需要的朋友可... 目录一、隐式转换：自动但需警惕的&ld编程quo;双刃剑”二、显式转换：三大核心方法详解三、典型场景
阅读更多...
MySQL快速复制一张表的四种核心方法(包括表结构和数据)

MySQL快速复制一张表的四种核心方法(包括表结构和数据)

《MySQL快速复制一张表的四种核心方法(包括表结构和数据)》本文详细介绍了四种复制MySQL表（结构+数据）的方法,并对每种方法进行了对比分析,适用于不同场景和数据量的复制需求,特别是针对超大表（1... 目录一、mysql 复制表（结构+数据）的 4 种核心方法（面试结构化回答）方法 1：CREATE
阅读更多...
详解C++ 存储二进制数据容器的几种方法

详解C++ 存储二进制数据容器的几种方法

《详解C++存储二进制数据容器的几种方法》本文主要介绍了详解C++存储二进制数据容器,包括std::vector、std::array、std::string、std::bitset和std::ve... 目录1.std::vector<uint8_t>（最常用）特点：适用场景：示例：2.std::arra
阅读更多...
springboot中配置logback-spring.xml的方法

springboot中配置logback-spring.xml的方法

《springboot中配置logback-spring.xml的方法》文章介绍了如何在SpringBoot项目中配置logback-spring.xml文件来进行日志管理,包括如何定义日志输出方式、... 目录一、在src/main/resources目录下，也就是在classpath路径下创建logba
阅读更多...
SQL Server中行转列方法详细讲解

SQL Server中行转列方法详细讲解

《SQLServer中行转列方法详细讲解》SQL行转列、列转行可以帮助我们更方便地处理数据,生成需要的报表和结果集,：本文主要介绍SQLServer中行转列方法的相关资料,需要的朋友可以参考下... 目录前言一、为什么需要行转列二、行转列的基本概念三、使用PIVOT运算符进行行转列1.创建示例数据表并插入数
阅读更多...
C++打印 vector的几种方法小结

C++打印 vector的几种方法小结

《C++打印vector的几种方法小结》本文介绍了C++中遍历vector的几种方法,包括使用迭代器、auto关键字、typedef、计数器以及C++11引入的范围基础循环,具有一定的参考价值,感兴... 目录1. 使用迭代器2. 使用 auto (C++11) / typedef / type alias
阅读更多...
python项目打包成docker容器镜像的两种方法实现

python项目打包成docker容器镜像的两种方法实现

《python项目打包成docker容器镜像的两种方法实现》本文介绍两种将Python项目打包为Docker镜像的方法,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要... 目录简单版：（一次成功，后续下载对应的软件依赖）第一步：肯定是构建dockerfile，如下：第二步
阅读更多...
C# GC回收的方法实现

C# GC回收的方法实现

《C#GC回收的方法实现》本文主要介绍了C#GC回收的方法实现,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧... 目录 一、什么是 GC？ 二、GC 管理的是哪部分内存？ 三、GC 什么时候触发？️ 四、GC 如何判断一个对象是“垃圾
阅读更多...

Copyright China编程 23002807@qq.com

沪ICP备2023033072号-2