将 FormData 转换为查询字符串的更简单方法

2022-01-15 00:00:00 xmlhttprequest javascript form-data

我正在通过 XMLHttpRequest 发送一个 POST 请求，其中将数据输入到 HTML 表单中.不受 JavaScript 干扰的表单将提交其编码为 application/x-www-form-urlencoded 的数据.

I’m sending a POST request via XMLHttpRequest with data entered into an HTML form. The form without interference of JavaScript would submit its data encoded as application/x-www-form-urlencoded.

使用 XMLHttpRequest，我想通过 FormData API 发送数据，该 API 不起作用，因为它将数据视为编码为 multipart/form-data.因此，我需要将数据作为查询字符串，正确转义，写入 XMLHttpRequest 的发送方法.

With the XMLHttpRequest, I wanted to send the data with via the FormData API which does not work since it treats the data as if it were encoded as multipart/form-data. Therefor I need to write the data as a query string, properly escaped, into the send method of the XMLHttpRequest.

addEntryForm.addEventListener('submit', function(event) {
    // Gather form data
    var formData = new FormData(this);
    // Array to store the stringified and encoded key-value-pairs.
    var parameters = []
    for (var pair of formData.entries()) {
        parameters.push(
            encodeURIComponent(pair[0]) + '=' +
            encodeURIComponent(pair[1])
        );
    }

    var httpRequest = new XMLHttpRequest();
    httpRequest.open(form.method, form.action);

    httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

    httpRequest.onreadystatechange = function() {
        if (httpRequest.readyState === XMLHttpRequest.DONE) {
            if (httpRequest.status === 200) {
                console.log('Successfully submitted the request');
            } else {
                console.log('Error while submitting the request');
            }
        }
    };

    httpRequest.send(parameters.join('&'));

    // Prevent submitting the form via regular request
    event.preventDefault();
});

现在，带有 for ... of 循环等的整个事情似乎有点令人费解.有没有更简单的方法将 FormData 转换为查询字符串?或者我可以用不同的编码发送 FormData 吗?

Now this whole thing with the for ... of loop, etc. seems a bit convoluted. Is there a simpler way to transform FormData into a query string? Or can I somehow send FormData with a different encoding?

推荐答案

你可以使用 URLSearchParams

const queryString = new URLSearchParams(new FormData(myForm)).toString()

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