在浏览器中退出全屏的按钮不会更新

Question

我为我当前的项目实现了一些全屏功能，下面是脚本:

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();
        }
    }
});

一切都工作得很好，这个脚本除了当用户使用浏览器功能退出全屏(如键盘中的f11和ESC按钮)，这不会更新我的退出按钮再次成为一个全屏按钮(我已经看到了全屏和最小化按钮在Youtube和最小化按钮更新，即使用户使用浏览器功能退出全屏)。你们能帮帮我吗?谢谢。

这是要替换的html输入按钮:

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

Answer 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();
    }
}

Answer 2

我通过使用javascript中的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();
        }
    });
}