SpookyJS中的全局变量和外部函数

时间:2014-05-15 15:18:56

标签: node.js global-variables webautomation spookyjs

我是SpookyJS / CasperJS的新手,我试图找出执行流程。

这就是我想要实现的目标:

  • 加载页面

  • 存储页面图像

  • 将此图像传递给函数并执行它(此过程很长:约15秒)

  • 等待函数返回结果

  • 使用返回的值填充已加载页面

  • 中表单中的字段
  • 提交表格

这是一个代码片段,试图解释我提出的解决方案:

var globProcessedImage;

try {
    var Spooky = require('spooky');
} catch (e) {
    var Spooky = require('../lib/spooky');
}

var spooky = new Spooky({
    child: {
        transport: 'http'
    },
    casper: {
        logLevel: 'debug',
        verbose: true
    }
}, function (err) {
    if (err) {
        e = new Error('Failed to initialize SpookyJS');
        e.details = err;
        throw e;
    }

    spooky.start('http://example.com/');

    spooky.then(function() {
        this.captureSelector('./image.png', '#img-node');
    });

    spooky.waitFor(function() {
        this.emit('image.processed');
        return globProcessedImage !== undefined;
    }, function then() {
        processedImage = globProcessedImage;
        this.sendKeys('#imagePassword', processedImage);
    });

    spooky.then(function() {
        this.capture('./page.png');
    });

    spooky.run();

    spooky.on('image.processed', function() {
        setTimeout(function() {
            globProcessedImage = 'my_result_string';
        }, 15000);
    });
});

spooky.on('error', function (e, stack) {
    console.error(e);

    if (stack) {
        console.log(stack);
    }
});

spooky.on('log', function (log) {
    if (log.space === 'remote') {
        console.log(log.message.replace(/ \- .*/, ''));
    }
});

当我运行应用程序时,我收到以下错误:

ReferenceError: Can't find variable: globProcessedImage

如何在SpookyJS中显示globProcessedImage?这是在Web自动化期间处理外部函数的正确方法吗?

提前致谢。

1 个答案:

答案 0 :(得分:0)

编辑:在编写本文时,SpookyJS并不支持按值将对象传递到waitFor回调的附加语法。所以这段代码不起作用。

与casperjs相比,spookyjs有三种可能的上下文:怪异的上下文,casper上下文和页面上下文。

您尝试访问从casper上下文在spooky上下文中定义的变量。您可以按照本期中所述在上下文之间传递变量:How to make global variables available to functions inside casper?

因此,根据您的代码进行调整,您应该:

var globProcessedImage;

try {
    var Spooky = require('spooky');
} catch (e) {
    var Spooky = require('../lib/spooky');
}

var spooky = new Spooky({
    child: {
        transport: 'http'
    },
    casper: {
        logLevel: 'debug',
        verbose: true
    }
}, function (err) {
    if (err) {
        e = new Error('Failed to initialize SpookyJS');
        e.details = err;
        throw e;
    }

    spooky.start('http://example.com/');

    spooky.then(function() {
        this.captureSelector('./image.png', '#img-node');
        // start longRunning here
    });

    spooky.waitFor([{spookyGlobProcessedImage: globProcessedImage}, function() {
        return spookyGlobProcessedImage !== undefined;
    }], [{spookyGlobProcessedImage: globProcessedImage}, function then() {
        this.emit('image.processed', spookyGlobProcessedImage);
        processedImage = spookyGlobProcessedImage;
        this.sendKeys('#imagePassword', processedImage);
    }]);

    spooky.then(function() {
        this.capture('./page.png');
    });

    spooky.run();

    spooky.on('image.processed', function(spookyGlobProcessedImage) {
        this.echo("spookyGlobProcessedImage is " + spookyGlobProcessedImage);
    });
});

spooky.on('error', function (e, stack) {
    console.error(e);

    if (stack) {
        console.log(stack);
    }
});

spooky.on('log', function (log) {
    if (log.space === 'remote') {
        console.log(log.message.replace(/ \- .*/, ''));
    }
});

我不确定spooky.waitFor是否支持此语法。