22.JavaScript制作一个简单的提示框插件

javascript制作一个简单的提示框插件

下面是制作的提示框插件文件

window.myplugin = window.myplugin || {};

window.myplugin.showmsg = (function () {
    var *, //蒙层
        promptbox, //提示框
        closespan, //关闭按钮
        titlespan, //提示标题
        contextspan, //提示信息
        okbtn, //确定按钮
        cancelbtn, //取消按钮
        isregevent, //是否注册事件
        option; //传入的参数



    /**
     * 初始化蒙层
     */
    function init*() {
        if (!*) { //没有蒙层则初始化
            //蒙层：覆盖整个窗口，半透明的黑色
            * = document.createelement("div");
            *.style.position = "fixed";
            *.style.width = *.style.height = "100%";
            *.style.left = *.style.top = 0;
            *.style.background = "rgba(0,0,0,.5)";
            document.body.appendchild(*);
        }
        *.style.display = "block"; //展示蒙层
    }

    /**
     * 初始化提示框
     */
    function initpromptbox() {
        //提示框：宽高300，位置居中
        if (!promptbox) {
            promptbox = document.createelement("div");
            promptbox.style.width = promptbox.style.height = "300px";
            promptbox.style.background = "#fff";
            promptbox.style.fontsize = "14px";
            promptbox.style.position = "absolute";
            promptbox.style.top = promptbox.style.left = "50%";
            promptbox.style.marginleft = promptbox.style.margintop = "-150px";
            promptbox.style["data-myplugin-id"] = "promptbox";
            initpromptcontext();
            *.appendchild(promptbox);
            titlespan = document.queryselector("[data-myplugin-id='title']"); //提示标题
            contextspan = document.queryselector("[data-myplugin-id='message']"); //提示信息
            closespan = document.queryselector("[data-myplugin-id='close']"); //关闭按钮
            okbtn = document.queryselector("[data-myplugin-id='ok']"); //确定按钮
            cancelbtn = document.queryselector("[data-myplugin-id='cancel']"); //取消按钮
        }

        okbtn.innertext = option.oktext || "确定";
        cancelbtn.innertext = option.canceltext || "取消";
        titlespan.innertext = option.title || "提示";
        contextspan.innertext = option.context || "";
    }

    /**
     * 初始化提示框中的内容
     */
    function initpromptcontext() {
        //内容包含：标题，关闭按钮，提示信息，确定按钮，取消按钮

        //创建标题，关闭按钮
        var div = document.createelement("div");
        div.innerhtml = `<span style="float:left;" data-myplugin-id="title"></span>
        <span  style="float:right;cursor:pointer;" data-myplugin-id="close">x</span>`;
        div.style.height = "50px";
        div.style.padding = "10px 20px";
        div.style.background = "#eee";
        div.style.boxsizing = "border-box";
        promptbox.appendchild(div);

        //创建提示信息
        div = document.createelement("div");
        div.innerhtml = `<span  data-myplugin-id="message"></span>`;
        div.style.height = "200px";
        div.style.padding = "10px 20px";
        div.style.boxsizing = "border-box";
        promptbox.appendchild(div);

        //创建确定按钮，取消按钮
        div = document.createelement("div");
        div.innerhtml = `<button style="float:right;margin:10px;cursor:pointer;" data-myplugin-id="cancel"></button><button style="float:right;margin:10px;cursor:pointer;" data-myplugin-id="ok"></button>`;
        div.style.height = "50px";
        div.style.padding = "10px 20px";
        div.style.boxsizing = "border-box";
        promptbox.appendchild(div);
    }

    //注册事件
    function regevent() {
        if (!isregevent) { //未注册事件
            //1.点击关闭，点击蒙层，点击取消按钮
            closespan.onclick = *.onclick = function () {
                *.style.display = "none"; //隐藏蒙层
            };

            okbtn.onclick = function () {
                option && option.okfunction && option.okfunction();
                *.style.display = "none"; //隐藏蒙层
            }

            cancelbtn.onclick = function () {
                option && option.cancelfunction && option.cancelfunction();
                *.style.display = "none"; //隐藏蒙层
            }

            //2.拖动提示框事件
            window.onmousedown = function (e) {
                var target = gettarget(e.target); //是否包含目标元素

                if (target) {
                    var style = window.getcomputedstyle(target);
                    var left = parseint(style.left);
                    var top = parseint(style.top);
                    var disx = parseint(e.pagex) - left;
                    var disy = parseint(e.pagey) - top;

                    window.onmousemove = function (e) {
                        var newleft = parseint(e.pagex) - disx;
                        var newtop = parseint(e.pagey) - disy;

                        promptbox.style.left = newleft + "px";
                        promptbox.style.top = newtop + "px";

                    };
                    window.onmouseup = window.onmouseleave = function () {
                        window.onmousemove = null;
                    }
                }
            };

            function gettarget(target) {
                while (target) {
                    if (target.tagname === "div" && target.style["data-myplugin-id"] === "promptbox") {
                        return target;
                    } else {
                        target = target.parentelement;
                    }
                }
                return false;
            }
        }
    }




    /**
     * @param {object} opts 
     * opts.title : 提示标题
     * opts.context : 提示信息
     * opts.canceltext:取消按钮内容
     * opts.oktext:确定按钮内容
     * opts.canceltext:取消按钮内容
     * opts.okfunction:确定按钮的回调函数
     * opts.cancelfunction:取消按钮的回调函数
     */
    function showmsg(opts) {
        if (typeof opts === "string") {
            option = {
                context: opts
            }
        } else {
            option = opts || {};
        }
        init*();
        initpromptbox();
        regevent();
    }

    return showmsg;
}());

 

引入并使用myplugin.js文件

<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>document</title>
</head>

<body>
    <script src="./js/myplugin.js"></script>
    <script>
        window.myplugin.showmsg({
            title: "信息",
            context: "确定删除吗",
            oktext: "ok",
            canceltext: "cancel",
            okfunction: function(){
                console.log("点击ok按钮");
            },
            cancelfunction:function(){
                console.log("点击cancel按钮");
            }
        });
    </script>
</body>

</html>

 

效果展示：