在表单提交中发送HTTP标头CasperJS

qui 发表于 Dev

WHO

我对CasperJS进行了以下测试：

this.fillSelectors("#registration-form", {
    "#first-name": "Bob",
    "#last-name": "Smith",
    "#email-address": RANDOM_EMAIL,
    "#password": PASSWORD,
    "#password-confirm": PASSWORD
}, true);

我希望能够与此一起发送HTTP标头。如果没有“手动”发布表单，我似乎找不到找到这种方法的方式，这不是我想要的测试。

Artjom B.

有一种比下面的方法更简单的方法。您可以访问casper.page.customHeadersPhantomJS的Webpage实例的属性。

casper.then(function() {
    casper.page.customHeaders = {
        "CuStOm": "Header"
    }; // set headers
    this.fillSelectors("#registration-form", { /*...*/ }, true);
});

casper.then(function() {
    casper.page.customHeaders = {}; // reset headers
});

问题在于，此方法会将您的自定义标头添加到每个请求，直到再次禁用它为止。您可以尝试基于setTimeout或直接在后面重置标题fillSelectors。

您无法在浏览器中设置表单提交的标题。__utils__.sendAJAX也没有提供自定义标头。

您将需要使用XMLHttpRequest发送请求。以下函数替换表单的提交处理程序以发送Ajax调用并等待：

casper.thenFormToXHR = function(formSelector, data, customHeaders){
    this.thenEvaluate(function(formSelector, customHeaders){
        // see https://stackoverflow.com/a/19838177/1816580
        function submitForm(oFormElement) {
            window.__requestDone = false;
            var xhr = new XMLHttpRequest();
            for(var header in customHeaders) {
                xhr.setRequestHeader(header, customHeaders[header]);
            }
            xhr.onload = function(){
                window.__requestDone = true;
            };
            xhr.open (oFormElement.method, oFormElement.action, true);
            xhr.send (new FormData(oFormElement));
            return false;
        }
        document.querySelector(formSelector).onsubmit = submitForm;
    }, formSelector, customHeaders);
    this.then(function(){
        this.fillSelectors(formSelector, data, true);
    });
    this.waitFor(function check(){
        return this.evaluate(function(){
            return window.__requestDone;
        });
    });
};

然后可以像这样调用：

casper.thenFormToXHR("#registration-form", {
    "#first-name": "Bob",
    "#last-name": "Smith",
    "#email-address": RANDOM_EMAIL,
    "#password": PASSWORD,
    "#password-confirm": PASSWORD
}, {
    "X-Requested-With": "XMLHttpRequest" // here should be your custom headers
});

如果您不需要等待XHR完成，则可以减少代码：

casper.formToXHR = function(formSelector, data, customHeaders){
    this.evaluate(function(formSelector, customHeaders){
        // see https://stackoverflow.com/a/19838177/1816580
        function submitForm(oFormElement) {
            var xhr = new XMLHttpRequest();
            for(var header in customHeaders) {
                xhr.setRequestHeader(header, customHeaders[header]);
            }
            xhr.open (oFormElement.method, oFormElement.action, true);
            xhr.send (new FormData(oFormElement));
            return false;
        }
        document.querySelector(formSelector).onsubmit = submitForm;
    }, formSelector, customHeaders);
    this.fillSelectors(formSelector, data, true);
};