等待Casper.js中的URL更改？ [英] Wait for URL change in Casper.js?

问题描述

Casper.js 中有 waitForUrl（）功能，但是可以 waitForUrlChange（） in Casper.js ？

There is a waitForUrl() functionality in Casper.js, but is it possible to waitForUrlChange() in Casper.js?

我的意思是检测到更改在 this.getCurrentUrl（）值。我无法预测新的网址值。它可以是任何东西。

I mean detecting a change in this.getCurrentUrl() value. I can't predict the new url value. It can be anything.

推荐答案

不是内置的，但是你可以自己写很容易：

Not built in, but you can write your own pretty easy:

casper.waitForUrlChange = function(then, onTimeout, timeout){
    var oldUrl;
    this.then(function(){
        oldUrl = this.getCurrentUrl();
    }).waitFor(function check(){
        return oldUrl === this.getCurrentUrl();
    }, then, onTimeout, timeout);
    return this;
};

这是一个正确的函数扩展，因为它与其他 wait * 函数（参数是可选的，它等待），它支持构建器模式（也被一些人称为promise模式）。

This is a proper function extension, because it has the same semantics as the other wait* functions (arguments are optional and it waits) and it supports the builder pattern (also called promise pattern by some).

As Darren Cook 提到，一个可以通过检查CasperJS中是否已存在 waitForUrlChange 以及CasperJS何时更改其API时使用动态参数列表来进一步改进：

As mentioned by Darren Cook, one could improve this further by checking whether waitForUrlChange already exists in CasperJS and using a dynamic arguments list for when CasperJS changes its API:

if (!casper.waitForUrlChange) {
    casper.waitForUrlChange = function(){
        var oldUrl;
        // add the check function to the beginning of the arguments...
        Array.prototype.unshift.call(arguments, function check(){
            return oldUrl === this.getCurrentUrl();
        });
        this.then(function(){
            oldUrl = this.getCurrentUrl();
        });
        this.waitFor.apply(this, arguments);
        return this;
    };
}

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