[Asp.Net Core] Blazor WebAssembly

前言

默认的 index.html 显示的 Loading 太简陋了. 而且没有加载进度条.
所以做了一个.
代码地址 : https://github.com/BlazorPlus/BlazorDemoWasmLoading
只需要改 index. html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
    <title>BlazorDemoWasmLoading</title>
    <base href="/" />
    <link href="css/bootstrap/bootstrap.min.css" rel="stylesheet" />
    <link href="css/app.css" rel="stylesheet" />
    <link href="manifest.json" rel="manifest" />
    <link rel="apple-touch-icon" sizes="512x512" href="icon-512.png" />
</head>

<body>
    <app>
        <div style="position:fixed;left:0;top:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;">

            <svg version='1.1' xmlns='http://www.w3.org/2000/svg' x='0px' y='0px' width='80px' height='80px' viewBox='0 0 40 40' enable-background='new 0 0 40 40' xml:space='preserve'>
            <path opacity='0.2' fill='#000' d='M20.201,5.169c-8.254,0-14.946,6.692-14.946,14.946c0,8.255,6.692,14.946,14.946,14.946 s14.946-6.691,14.946-14.946C35.146,11.861,28.455,5.169,20.201,5.169z M20.201,31.749c-6.425,0-11.634-5.208-11.634-11.634 c0-6.425,5.209-11.634,11.634-11.634c6.425,0,11.633,5.209,11.633,11.634C31.834,26.541,26.626,31.749,20.201,31.749z'></path>
            <path fill='#000' d='M26.013,10.047l1.654-2.866c-2.198-1.272-4.743-2.012-7.466-2.012h0v3.312h0 C22.32,8.481,24.301,9.057,26.013,10.047z' transform='rotate(228 20 20)'>
            <animateTransform attributeType='xml' attributeName='transform' type='rotate' from='0 20 20' to='360 20 20' dur='0.5s' repeatCount='indefinite'></animateTransform>
                </path>
            </svg>

            <div style="height:30px">
                Loading..
            </div>
            <div id="progressbar" style="display: inline-block; width: 260px; height: 12px; border: solid 1px gray; border-radius:6px; position: relative;"></div>
        </div>
    </app>

    <script type="text/javascript">
        var preLoadStart = 0;
        var preLoadCount = 0;
        var preLoadError = 0;
        var preLoadFinish = 0;
        function preLoadResource(dllname) {
            preLoadCount++;
            var xh = new XMLHttpRequest();
            xh.open("GET", dllname, true);
            xh.onload = function () {
                preLoadFinish++;
                if (xh.status != 200) preLoadError++;

                console.log(preLoadFinish + "/" + preLoadCount, dllname);

                var progressbar = document.getElementById("progressbar");
                if (progressbar) {
                    progressbar.innerHTML = "<span style='position:absolute;left:0;background-color:darkgreen;height:10px;border-radius:5px;width:" + (progressbar.offsetWidth * preLoadFinish / preLoadCount) + "px'></span>";
                }

                if (preLoadFinish == preLoadCount) {
                    var span = new Date().getTime() - preLoadStart;
                    console.log("All Done In " + span + " ms , " + preLoadError + " errors");
                }
            }
            xh.send("");
        }
        function preLoadAll() {
            preLoadStart = new Date().getTime();
            var xh = new XMLHttpRequest();
            xh.open("GET", "_framework/blazor.boot.json", true);
            xh.onload = function () {
                var res = JSON.parse(xh.responseText);
                console.log(res);
                for (var p in res.resources.assembly)
                    preLoadResource("_framework/_bin/" + p);
                for (var p in res.resources.runtime)
                    preLoadResource("_framework/wasm/" + p);
                preLoadResource("_framework/blazor.webassembly.js");
            }
            xh.send("");
        }
        preLoadAll();
    </script>

    <div id="blazor-error-ui">
        An unhandled error has occurred.
        <a href="" class="reload">Reload</a>
        <a class="dismiss">🗙</a>
    </div>
    <script src="_framework/blazor.webassembly.js"></script>
    <script>navigator.serviceWorker.register('service-worker.js');</script>
</body>

</html>