php - 调用 php 函数并在按钮单击时重定向

Question

我有一个 php 函数，其中正在创建一些 pdf。我有一个按钮，我想在单击按钮时调用该函数，然后重定向到一个 url。最简单的方法是什么？

Answer 1

如果您需要调用 PHP 方法，我会使用 AJAX。像这样的东西：

var btn = document.getElementById("button_id");

btn.onclick = function () {
    // Make AJAX request
    // On success, do this:
    window.location.href = "url to redirect to";
};

“发出 AJAX 请求”的代码可以很容易地用谷歌搜索，我会在一分钟内提供它:)

更新：

function ajaxFunction() {
    var ajaxRequest; // The variable that makes Ajax possible!

    try {
        // Firefox, Chrome, Opera 8.0+, Safari
        ajaxRequest = new XMLHttpRequest();
    } catch (e) {
        // Internet Explorer Browsers
        try {
            ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {
            try {
                ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP.6.0");
                } catch (e) {
                    try {
                        ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP.3.0");
                    } catch (e) {
                        throw new Error("This browser does not support XMLHttpRequest.");
                    }
                }
            }
        }
    }
    return ajaxRequest;
}

AJAX 代码 -

var req = ajaxFunction();
req.onreadystatechange = function (response) {
    if (response.status == 200 && response.readyState == 4) {
        window.location.href = "url to redirect to";
    }
}
req.open("POST", "your PHP file's URL", true);
req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
req.send(null);    // Or send any `key=value&` pairs as a string

Answer 2

有多种方法可以做到这一点。我会在 ajax 中调用 PHP 函数并根据函数返回值进行重定向。以下示例使用 jQuery：

jQuery：

$.ajax({
  url: 'createpdf.php',
  success: function(data) {
    if (data) window.location = 'link/to/new/path'; 
  }
});

PHP：

function create_pdf(){
    //Create PDF
    //If PDF was created successfully, return true
    return true;
}

Answer 3

<form name="input" action="whatever.php" method="get">
...
<input type="submit" value="Submit">
</form>