Dojo初探之4:dojo的event（鼠标/键盘）事件绑定操作（基于dojo1.11.2版本）

时间：2022-02-11 04:10:48

前言：

上一章详解了dojo的dom/query操作，本章基于dom/query基础上进行事件绑定操作

dojo的事件

dojo的事件绑定操作分为鼠标和键盘两种进行详解

1、鼠标事件

我们沿用上一章中所使用的方法进行事件绑定

（1）事件绑定操作：on(页面元素，事件，绑定方法）

// domConstruct.place(操作的元素, 父元素, "位置");位置：first,before,after
require(["dojo/dom-construct", "dojo/on", "dojo/domReady!"],
    function(domConstruct, on) {
        function moveFirst() {
            var list = dom.byId("list"),
                three = dom.byId("three");
            domConstruct.place(three, list, "first");
        }

        function moveBeforeTwo() {
            var two = dom.byId("two"),
                three = dom.byId("three");

            domConstruct.place(three, two, "before");
        }

        function moveAfterFour() {
            var four = dom.byId("four"),
                three = dom.byId("three");

            domConstruct.place(three, four, "after");
        }

        function moveLast() {
            var list = dom.byId("list"),
                three = dom.byId("three");

            domConstruct.place(three, list);
        }
        //绑定事件
        on(dom.byId("moveFirst"), "click", moveFirst);
        on(dom.byId("moveBeforeTwo"), "click", moveBeforeTwo);
        on(dom.byId("moveAfterFour"), "click", moveAfterFour);
        on(dom.byId("moveLast"), "click", moveLast);

        function destroyFirst() {
            var list = dom.byId("list"),
                items = list.getElementsByTagName("li");
            if (items.length) {
                //清除某个元素
                domConstruct.destroy(items[0]);
            }
        }

        function destroyAll() {
            //清空父类下的子元素
            domConstruct.empty("list");
        }
        // 给id为destroyFirst的元素绑定一个点击事件
        on(dom.byId("destroyFirst"), "click", destroyFirst);
        // 给id为destroyAll的元素绑定一个点击事件
        on(dom.byId("destroyAll"), "click", destroyAll);
    });

（2）页面：

<head>
    <title>domTest</title>
    <meta charset="utf-8">
    <script src="dojo/dojo.js">
    </script>
    <script src="js/view/domTest.js"></script>
</head>

<body>
    <ul id="list">
        <li id="one">One</li>
        <li id="two">Two</li>
        <li id="three">Three</li>
        <li id="four">Four</li>
        <li id="five">Five</li>
    </ul>
    <button id="moveFirst">The first item</button>
    <button id="moveBeforeTwo">Before Two</button>
    <button id="moveAfterFour">After Four</button>
    <button id="moveLast">The last item</button>
    <button id="destroyFirst">Destroy the first list item</button>
    <button id="destroyAll">Destroy all list items</button>
</body>

2、键盘事件

（1）绑定键盘事件

var dom = require("dojo/dom");
require(["dojo/on", "dojo/domReady!"], function(on) {
    //给document绑定一个松开按键的事件
    on(document, "keyup", function(event) {
        //把当前按键的值给id为keyCode的元素
        dom.byId("keyCode").value = event.keyCode;
    });
});
require(["dojo/dom-construct", "dojo/on", "dojo/query", "dojo/keys", "dojo/domReady!"],
    function(domConstruct, on, query, keys) {
        //给input并且类型是text的标签绑定一个键盘按下事件
        query("input[type='text']").on("keydown", function(event) {
            switch (event.keyCode) {
                case keys.UP_ARROW:
                    event.preventDefault();
                    alert("上");
                    break;
                case keys.DOWN_ARROW:
                    event.preventDefault();
                    alert("下");
                    break;
                case keys.ENTER:
                    alert("回车");
                    break;
                default:
                    alert("其他按键: " + event.keyCode);
            }
        });
    });

（2）页面

<head>
    <title>键盘事件测试</title>
    <meta charset="utf-8">
    <script src="dojo/dojo.js">
    </script>
    <script src="js/view/keyeventTest.js">
    </script>
</head>

<body>
    <h1>按任意键</h1> keyCode value: <input type="text" id="keyCode" size="2">
    <h1>按方向键上、下</h1>
    <input type="text" id="input1" value="up">
    <input type="text" id="input2" value="down">
    <input type="submit" id="send1" value="send"></body>

下一章将讲解dojo如何发送ajax请求

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