浏览器中退出全屏的按钮不会更新答案

【问题标题】：Button to exit full screen in browser doesn't update浏览器中退出全屏的按钮不会更新
【发布时间】：2015-09-15 13:18:20
【问题描述】：

我为我当前的项目实现了一些全屏功能，这是脚本：

jQuery(document).ready(function ($) {

    $(".full-screen-btn").bind("click", function () {
        launchIntoFullscreen(document.getElementById("main-container"));
        showExitFullScreenButton();
    });

    document.addEventListener("fullscreenchange", checkIfFullScreen);
    document.addEventListener("webkitfullscreenchange", checkIfFullScreen);
    document.addEventListener("mozfullscreenchange", checkIfFullScreen);
    document.addEventListener("MSFullscreenChange", checkIfFullScreen);

    function showFullScreenButton() {
        $(".exit-full-screen-btn").addClass("full-screen-btn");
        $(".exit-full-screen-btn").unbind('click')
        $(".full-screen-btn").removeClass("exit-full-screen-btn");
        $(".full-screen-btn").attr("value", "Full Screen");
        $(".full-screen-btn").bind("click", function () {
            launchIntoFullscreen(document.getElementById("main-container"));
            showExitFullScreenButton();
        });
    }

    function showExitFullScreenButton() {
        $(".full-screen-btn").addClass("exit-full-screen-btn");
        $(".full-screen-btn").unbind('click')
        $(".exit-full-screen-btn").removeClass("full-screen-btn");
        $(".exit-full-screen-btn").attr("value", "Exit");
        $(".exit-full-screen-btn").bind("click", function () {
            exitFullscreen();
            showFullScreenButton();
        });
    }

    function checkIfFullScreen() {
        if ($(".full-screen-btn").length) {
            showFullScreenButton();
        } else {
            showExitFullScreenButton();
        }
    }

    // Find the right method, call on correct element
    function launchIntoFullscreen(element) {
        if (element.requestFullscreen) {
            element.requestFullscreen();
        } else if (element.mozRequestFullScreen) {
            element.mozRequestFullScreen();
        } else if (element.webkitRequestFullscreen) {
            element.webkitRequestFullscreen();
        } else if (element.msRequestFullscreen) {
            element.msRequestFullscreen();
        }
    }

    // Close fullscreen
    function exitFullscreen() {
        if (document.exitFullscreen) {
            document.exitFullscreen();
        } else if (document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
        } else if (document.webkitExitFullscreen) {
            document.webkitExitFullscreen();
        }
    }
});

除了用户使用浏览器功能退出全屏（如键盘中的 f11 和 ESC 按钮）时，此脚本一切正常，这不会将我的退出按钮再次更新为全屏按钮（我已经在 Youtube 中看到全屏和最小化按钮，即使用户使用浏览器功能退出全屏，最小化按钮也会更新）。你们能帮帮我吗？谢谢。

这是被替换的html输入按钮：

<input type="button" value="Full Screen" class="full-screen-btn"/>

【问题讨论】：

标签： javascript jquery html html5-fullscreen

【解决方案1】：

不确定，但我认为你应该这样做：

function exitFullscreen() {

    showFullScreenButton(); // THIS IS MY EDIT

    if (document.exitFullscreen) {
        document.exitFullscreen();
    } else if (document.mozCancelFullScreen) {
        document.mozCancelFullScreen();
    } else if (document.webkitExitFullscreen) {
        document.webkitExitFullscreen();
    }
}

【讨论】：

不起作用，我想我会尝试脚本中的event keyup，看看它是否可以处理工作。

【解决方案2】：

我通过在 javascript 中使用 keyup Event 找到了答案：

function checkIfFullScreen() {
    if ($(".full-screen-btn").length) {
        showFullScreenButton();
    } else {

        showExitFullScreenButton();
    }

    // check if f11 or ESC button was pressed
    $(document).keyup(function (e) {
        if (e.which == 122 || e.which == 27) {
            e.preventDefault();
            showFullScreenButton();
        }
    });
}

【讨论】：