在页面加载时，JavaScript加载屏幕

This is a little hard to explain, So I'll try my best

这有点难解释，所以我会尽力的。

So while a HTML page loads, I'd like there to be a cool loading screen going on. When it finishes loading, I want the loading screen to clear and the HTML document to be shown.

所以当HTML页面加载时，我希望有一个很酷的加载屏幕。加载完成后，我希望加载屏幕清晰，并显示HTML文档。

Basically, I want This:

基本上,我想要这样的:

CSS:

CSS:

/* Absolute Center CSS Spinner */
.loading {
  position: fixed;
  z-index: 999;
  height: 2em;
  width: 2em;
  overflow: show;
  margin: auto;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

/* Transparent Overlay */
.loading:before {
  content: '';
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.3);
}

/* :not(:required) hides these rules from IE9 and below */
.loading:not(:required) {
  /* hide "loading..." text */
  font: 0/0 a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}

.loading:not(:required):after {
  content: '';
  display: block;
  font-size: 10px;
  width: 1em;
  height: 1em;
  margin-top: -0.5em;
  -webkit-animation: spinner 1500ms infinite linear;
  -moz-animation: spinner 1500ms infinite linear;
  -ms-animation: spinner 1500ms infinite linear;
  -o-animation: spinner 1500ms infinite linear;
  animation: spinner 1500ms infinite linear;
  border-radius: 0.5em;
  -webkit-box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.5) -1.5em 0 0 0, rgba(0, 0, 0, 0.5) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
  box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) -1.5em 0 0 0, rgba(0, 0, 0, 0.75) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
}

/* Animation */

@-webkit-keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@-moz-keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@-o-keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

HTML:

HTML:

<div class="loading">Loading&#8230;</div>

to be happening while the page loads. when the page loads, That is cleared, and the rest of the HTML document is displayed. (I'm making a credits system and while the credits load i just really need it to say it's loading, people complain they can't click anything and i have to tell them all it's just loading)

在页面加载时发生。当页面加载时，将清除该页面，并显示HTML文档的其余部分。(我正在制作一个信用系统，当我需要它的时候它就会显示它正在加载，人们抱怨他们不能点击任何东西，我必须告诉他们所有的东西都在加载)

I'd like to stay away from Ajax as much as possible since I'd like to learn Javascript.

我希望尽可能远离Ajax，因为我想学习Javascript。

6 个解决方案

#1

You can wait until the body is ready:

你可以等到身体准备好:

function onReady(callback) {
  var intervalId = window.setInterval(function() {
    if (document.getElementsByTagName('body')[0] !== undefined) {
      window.clearInterval(intervalId);
      callback.call(this);
    }
  }, 1000);
}

function setVisible(selector, visible) {
  document.querySelector(selector).style.display = visible ? 'block' : 'none';
}

onReady(function() {
  setVisible('.page', true);
  setVisible('#loading', false);
});

body {
  background: #FFF url("https://i.imgur.com/KheAuef.png") top left repeat-x;
  font-family: 'Alex Brush', cursive !important;
}

.page    { display: none; padding: 0 0.5em; }
.page h1 { font-size: 2em; line-height: 1em; margin-top: 1.1em; font-weight: bold; }
.page p  { font-size: 1.5em; line-height: 1.275em; margin-top: 0.15em; }

#loading {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 100;
  width: 100vw;
  height: 100vh;
  background-color: rgba(192, 192, 192, 0.5);
  background-image: url("https://i.stack.imgur.com/MnyxU.gif");
  background-repeat: no-repeat;
  background-position: center;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css" rel="stylesheet"/>
<link href="https://fonts.googleapis.com/css?family=Alex+Brush" rel="stylesheet">
<div class="page">
  <h1>The standard Lorem Ipsum passage</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
    dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
<div id="loading"></div>

Here is a JSFiddle that demonstrates this technique.

下面是一个演示该技术的JSFiddle。

#2

At the beginning of your loading script, just make your

在加载脚本的开始，只需要创建您的

visible through css [display:block;] and make the rest of the page invisible through css[display:none;].

通过css可见[display:block;]，通过css使页面的其余部分不可见[display:none;]。

Once the loading is done, just make the loading invisible and the page visible again with the same technique. You can use the document.getElementById() to select the divs you want to change the display.

加载完成后，只需使加载不可见，并且使用相同的技术再次显示页面。可以使用document.getElementById()选择要更改显示的div。

Edit: Here's what it would sort of look like. When the body finhishes loading, it will call the javascript function that will change the display values of the different elements. By default your style would be to have the page not visible the loading visible.

编辑:这是它看起来的样子。当主体完成加载时，它将调用javascript函数，该函数将更改不同元素的显示值。默认情况下，样式是页面不可见，加载不可见。

<head>
    <style>
        #page{
            diplay:none;
        }
        #laoding{
            display:block;
        }
    </style>
    <script>
        function myFunction()
        {
            document.getElementById("page").style.display = "block";
            document.getElementById("loading").style.diplay = "none";
        }
    </script>
</head>

<body onload="myFunction()">
    <div id="page">

    </div>
    <div id="loading">

    </div>
</body>

#3

To build further upon the ajax part which you may or may not use (from the comments)

要进一步构建ajax部分，您可以使用它，也可以不使用它(来自注释)

a simple way to load another page and replace it with your current one is:

加载另一个页面并将其替换为当前页面的简单方法是:

<script>
    $(document).ready( function() {
        $.ajax({
            type: 'get',
            url: 'http://pageToLoad.from',
            success: function(response) {
                // response = data which has been received and passed on to the 'success' function.
                $('body').html(response);
            }
        });
    });
<script>

#4

I would suggest adding class no-js to your html to nest your CSS selectors under it like:

我建议将类no-js添加到html中，将CSS选择器嵌套在下面:

.loading {
    display: none;
 }

.no-js .loading {
 display: block;
 //....
}

and when you finish loading your credit code remove it:

当你下载完你的信用代码后，删除它:

$('html').removeClass('no-js');

This will hide your loading spinner as there's no no-js class in html it means you already loaded your credit code

这将隐藏你的加载spinner，因为在html中没有no-js类，这意味着你已经加载了你的信用代码

#5

If in your site you have ajax calls loading some data, and this is the reason the page is loading slow, the best solution I found is with

如果在您的站点中有ajax调用来加载一些数据，这就是页面加载缓慢的原因，那么我找到的最佳解决方案是使用ajax

$(document).ajaxStop(function(){
    alert("All AJAX requests completed");
});

https://jsfiddle.net/44t5a8zm/ - here you can add some ajax calls and test it.

在这里，您可以添加一些ajax调用并对其进行测试。

#6

This method uses the WindowOrWorkerGlobalScope.setInterval(https://developer.mozilla.org/en-US/doc) method to track the ready states of the document & see if the <body> element exists.

该方法使用WindowOrWorkerGlobalScope.setInterval(https://developer.mozilla.org/en-US/doc)方法跟踪文档的准备状态，并查看元素是否存在。

// Function > Loader Screen Script
(function LoaderScreenScript(window = window, document = window.document, undefined = window.undefined || void 0) {
    // Initialization > (Processing Time, Condition, Timeout, Loader (...))
    let processingTime = 0,
        condition = function() {
            // Return
            return document.body
        },
        timeout = function() {
            // Return
            return (processingTime * 1e3) / 2
        },
        loaderScreenFontSize = typeof window.loaderScreenFontSize != 'undefined' ? window.loaderScreenFontSize : 14,
        loaderScreenMargin = typeof window.loaderScreenMargin != 'undefined' ? window.loaderScreenMargin : 10,
        loaderScreenMessage = typeof window.loaderScreenMessage != 'undefined' ? window.loaderScreenMessage : 'Loading, please wait…',
        loaderScreenOpacity = typeof window.loaderScreenOpacity != 'undefined' ? window.loaderScreenOpacity : .75,
        loaderScreenTransition = typeof window.loaderScreenTransition != 'undefined' ? window.loaderScreenTransition : .675,
        loaderScreenWidth = typeof window.loaderScreenWidth != 'undefined' ? window.loaderScreenWidth : 7.5;

    // Function > Update
    function update() {
        // Set Timeout
        setTimeout(function() {
            // Initialization > (Data, Metadata)
            var data = document.createElement('loader-screen-element'),
                metadata = setInterval(function() {
                    /* Logic
                            [if:else if:else statement]
                    */
                    if (document.readyState == 'complete') {
                        // Alpha
                        alpha();

                        // Test
                        test()
                    }
                });

            // Insertion
            document.body.appendChild(data);

            // Style > <body> > Overflow
            document.body.style = ('overflow: hidden !important; pointer-events: none !important; user-drag: none !important; user-select: none !important;' + (document.body.getAttribute('style') || ' ')).trim();

            // Modification > Data
                // Inner HTML
                data.innerHTML =
                    '<style media=all type=text/css>' +
                        'body::selection {' +
                            'background-color: transparent !important;' +
                            'text-shadow: none !important' +
                        '} ' +
                        '@keyframes rotate {' +
                            '0% { transform: rotate(0) }' +
                            'to { transform: rotate(360deg) }' +
                        '}' +
                    '</style>' +
                    "<div style='animation: rotate 1s ease-in-out 0s infinite backwards; border: " + loaderScreenWidth + "px solid rgba(0, 0, 0, " + loaderScreenOpacity + "); border-top-color: rgba(0, 51, 255, " + loaderScreenOpacity + "); border-radius: 50%; height: 75px; margin: 0 auto; margin-bottom: " + loaderScreenMargin + "px; width: 75px'> </div>" +
                    "<small style='color: rgba(127, 127, 127, .675); font-family: \"Open Sans\", \"Calibri Light\", Calibri, sans-serif; font-size: " + loaderScreenFontSize + "px !important; margin: 0 auto; margin-top: " + loaderScreenMargin + "px; text-align: center'> " + loaderScreenMessage + " </small>";

                // Style
                data.style = 'align-items: center; background-color: rgba(255, 255, 255, .98); display: flex; flex-direction: column; height: ' + innerHeight + 'px; justify-content: center; left: 0; margin: auto; max-height: 100% !important; max-width: 100% !important; min-height: 100vh; min-width: 100vh; position: fixed; top: 0; transition: ' + loaderScreenTransition + 's ease-in-out; width: ' + innerWidth + 'px; z-index: 2147483647';

            // Function
                // Alpha
                function alpha() {
                    // Clear Interval
                    clearInterval(metadata)
                };

                // Test
                function test() {
                    // Style > Data
                        // Background Color
                        data.style.backgroundColor = 'transparent';

                        // Opacity
                        data.style.opacity = 0;

                    // Set Timeout
                    setTimeout(function() {
                        // Deletion
                        data.remove();

                        // Modification > <body> > Style
                        document.body.style = document.body.getAttribute('style').replace('overflow: hidden !important;', '').replace('pointer-events: none !important;', '').replace('user-drag: none !important;', '').replace('user-select: none !important;', '');
                        (document.body.getAttribute('style') || '').trim() || document.body.removeAttribute('style')
                    }, ((+getComputedStyle(data).getPropertyValue('animation-delay').replace(/[a-zA-Z]/g, '').trim() + +getComputedStyle(data).getPropertyValue('animation-duration').replace(/[a-zA-Z]/g, '').trim() + +getComputedStyle(data).getPropertyValue('transition-delay').replace(/[a-zA-Z]/g, '').trim() + +getComputedStyle(data).getPropertyValue('transition-duration').replace(/[a-zA-Z]/g, '').trim()) * 1e3) + 100);
                }
        }, timeout())
    };

    /* Logic
            [if:else if:else statement]
    */
    if (condition())
        // Update
        update();

    else {
        // Initialization > Data
        var data = setInterval(function() {
            /* Logic
                    [if:else if:else statement]
            */
            if (condition()) {
                // Update > Processing Time
                processingTime += 1;

                // Update
                update();

                // Metadata
                metadata()
            }
        });

        // Function > Metadata
        function metadata() {
            // Clear Interval
            clearInterval(data);

            /* Logic
                    [if:else if:else statement]

                > Deletion
            */
            if ('data' in window && typeof data == 'undefined')
                delete window.data
        }
    }
})(window, window.document, window.undefined || void 0)

This pre-loading screen was made by Lapys @ https://github.com/LapysDev

这个预加载屏幕由Lapys @ https://github.com/LapysDev制作