如果您下载了一个文件，该文件是保存的，而不是在文档中，则无法确定下载何时完成，因为它不在当前文档的范围内，而是浏览器中的一个单独进程。

这个Java/Spring示例检测下载的结束，在这一点上它隐藏了“Loading…”指示符。

方法:在JavaScript方面，设置一个最大过期时间为2分钟的cookie，并每秒钟轮询一次cookie过期时间。然后服务器端用更早的过期时间覆盖这个cookie——服务器进程的完成。一旦在JavaScript轮询中检测到cookie过期，“Loading…”就会被隐藏。

JavaScript的一面

function buttonClick() { // Suppose this is the handler for the button that starts
    $("#loadingProgressOverlay").show();  // Show loading animation
    startDownloadChecker("loadingProgressOverlay", 120);
    // Here you launch the download URL...
    window.location.href = "myapp.com/myapp/download";
}

// This JavaScript function detects the end of a download.
// It does timed polling for a non-expired Cookie, initially set on the
// client-side with a default max age of 2 min.,
// but then overridden on the server-side with an *earlier* expiration age
// (the completion of the server operation) and sent in the response.
// Either the JavaScript timer detects the expired cookie earlier than 2 min.
// (coming from the server), or the initial JavaScript-created cookie expires after 2 min.
function startDownloadChecker(imageId, timeout) {

    var cookieName = "ServerProcessCompleteChecker";  // Name of the cookie which is set and later overridden on the server
    var downloadTimer = 0;  // Reference to the timer object

    // The cookie is initially set on the client-side with a specified default timeout age (2 min. in our application)
    // It will be overridden on the server side with a new (earlier) expiration age (the completion of the server operation),
    // or auto-expire after 2 min.
    setCookie(cookieName, 0, timeout);

    // Set a timer to check for the cookie every second
    downloadTimer = window.setInterval(function () {

        var cookie = getCookie(cookieName);

        // If cookie expired (NOTE: this is equivalent to cookie "doesn't exist"), then clear "Loading..." and stop polling
        if ((typeof cookie === 'undefined')) {
            $("#" + imageId).hide();
            window.clearInterval(downloadTimer);
        }

    }, 1000); // Every second
}

// These are helper JavaScript functions for setting and retrieving a Cookie
function setCookie(name, value, expiresInSeconds) {
    var exdate = new Date();
    exdate.setTime(exdate.getTime() + expiresInSeconds * 1000);
    var c_value = escape(value) + ((expiresInSeconds == null) ? "" : "; expires=" + exdate.toUTCString());
    document.cookie = name + "=" + c_value + '; path=/';
}

function getCookie(name) {
    var parts = document.cookie.split(name + "=");
    if (parts.length == 2 ) {
        return parts.pop().split(";").shift();
    }
}

Java/Spring服务器端

    @RequestMapping("/download")
    public String download(HttpServletRequest request, HttpServletResponse response) throws Exception {
        //... Some logic for downloading, returning a result ...

        // Create a Cookie that will override the JavaScript-created
        // Max-Age-2min Cookie with an earlier expiration (same name)
        Cookie myCookie = new Cookie("ServerProcessCompleteChecker", "-1");
        myCookie.setMaxAge(0); // This is immediate expiration, but can also
                               // add +3 seconds for any flushing concerns
        myCookie.setPath("/");
        response.addCookie(myCookie);
        //... -- presumably the download is writing to the Output Stream...
        return null;
}

如果你不想在服务器上生成和存储文件，你是否愿意存储状态，例如文件进行中，文件完成?您的“等待”页面可以轮询服务器以了解文件生成何时完成。您不能确定是浏览器启动了下载，但您有一定的信心。

PrimeFaces也使用cookie投票。

monitorDownload ():

    monitorDownload: function(start, complete, monitorKey) {
        if(this.cookiesEnabled()) {
            if(start) {
                start();
            }

            var cookieName = monitorKey ? 'primefaces.download_' + monitorKey : 'primefaces.download';
            window.downloadMonitor = setInterval(function() {
                var downloadComplete = PrimeFaces.getCookie(cookieName);

                if(downloadComplete === 'true') {
                    if(complete) {
                        complete();
                    }
                    clearInterval(window.downloadMonitor);
                    PrimeFaces.setCookie(cookieName, null);
                }
            }, 1000);
        }
    },

我写了一个简单的JavaScript类，实现了一种类似于bulltorious回答中描述的技术。我希望它能对在座的人有用。

GitHub项目被称为response-monitor.js。

默认情况下，它使用spin.js作为等待指示器，但它也为自定义指示器的实现提供了一组回调。

jQuery是支持的，但不是必需的。

显著的特征

简单的集成 没有依赖关系 jQuery插件(可选) js集成(可选) 用于监视事件的可配置回调 同时处理多个请求 服务器端错误检测 超时检测 跨浏览器

示例使用

HTML

<!-- The response monitor implementation -->
<script src="response-monitor.js"></script>

<!-- Optional jQuery plug-in -->
<script src="response-monitor.jquery.js"></script>

<a class="my_anchors" href="/report?criteria1=a&criteria2=b#30">Link 1 (Timeout: 30s)</a>
<a class="my_anchors" href="/report?criteria1=b&criteria2=d#10">Link 2 (Timeout: 10s)</a>

<form id="my_form" method="POST">
    <input type="text" name="criteria1">
    <input type="text" name="criteria2">
    <input type="submit" value="Download Report">
</form>

客户端(纯JavaScript)

// Registering multiple anchors at once
var my_anchors = document.getElementsByClassName('my_anchors');
ResponseMonitor.register(my_anchors); // Clicking on the links initiates monitoring

// Registering a single form
var my_form = document.getElementById('my_form');
ResponseMonitor.register(my_form); // The submit event will be intercepted and monitored

客户端(jQuery)

$('.my_anchors').ResponseMonitor();
$('#my_form').ResponseMonitor({timeout: 20});

带有回调函数的客户端

// When options are defined, the default spin.js integration is bypassed
var options = {
    onRequest: function(token) {
        $('#cookie').html(token);
        $('#outcome').html('');
        $('#duration').html('');
    },
    onMonitor: function(countdown) {
        $('#duration').html(countdown);
    },
    onResponse: function(status) {
        $('#outcome').html(status==1 ? 'success' : 'failure');
    },
    onTimeout: function() {
        $('#outcome').html('timeout');
    }
};

// Monitor all anchors in the document
$('a').ResponseMonitor(options);

服务器(PHP)

$cookiePrefix = 'response-monitor'; // Must match the one set on the client options
$tokenValue = $_GET[$cookiePrefix];
$cookieName = $cookiePrefix.'_'.$tokenValue; // Example: response-monitor_1419642741528

// This value is passed to the client through the ResponseMonitor.onResponse callback
$cookieValue = 1; // For example, "1" can interpret as success and "0" as failure

setcookie(
    $cookieName,
    $cookieValue,
    time() + 300,          // Expire in 5 minutes
    "/",
    $_SERVER["HTTP_HOST"],
    true,
    false
);

header('Content-Type: text/plain');
header("Content-Disposition: attachment; filename=\"Response.txt\"");

sleep(5); // Simulate whatever delays the response
print_r($_REQUEST); // Dump the request in the text file

有关更多示例，请检查存储库中的examples文件夹。

我使用以下代码下载blobs并在下载后撤销对象URL。它在Chrome和Firefox中工作!

function download(blob){
    var url = URL.createObjectURL(blob);
    console.log('create ' + url);

    window.addEventListener('focus', window_focus, false);
    function window_focus(){
        window.removeEventListener('focus', window_focus, false);
        URL.revokeObjectURL(url);
        console.log('revoke ' + url);
    }
    location.href = url;
}

关闭文件下载对话框后，窗口将获得其焦点，因此将触发焦点事件。