为元素添加拖动事件（含例子）

程序员文章站 2022-03-27 20:20:57

//张鑫旭大神function startDrag(triggerElement, targetElement) { //定义拖动事件 triggerElement.addEventListener('mousedown', function(event) { //按下添加鼠标移动和放下事件 var originMouseX, originMouseY, moveX, moveY; //鼠标xy坐标，鼠标移动多少 originMouseX =...

//张鑫旭大神
function startDrag(triggerElement, targetElement) { //定义拖动事件
        triggerElement.addEventListener('mousedown', function(event) { //按下添加鼠标移动和放下事件
            var originMouseX, originMouseY, moveX, moveY; //鼠标xy坐标，鼠标移动多少
            originMouseX = event.clientX;
            originMouseY = event.clientY;
            triggerElement.style.cursor = "all-scroll"; //鼠标样式

            document.addEventListener('mousemove', mouseMove, false) 
            document.addEventListener('mouseup', mouseUp, false) 

            function mouseMove(event) {
                moveX = event.clientX - originMouseX
                moveY = event.clientY - originMouseY
                originMouseX = event.clientX
                originMouseY = event.clientY
                targetElement.style.marginLeft = moveX + targetElement.offsetLeft + 'px' //移动的距离加原来的距离  //left + absolute
                targetElement.style.marginTop = moveY + targetElement.offsetTop + 'px'
                    // 防止选取文字
                event.preventDefault();
                triggerElement.onselectstart = function() {
                    return false;
                }
            } // mouseMove end

            function mouseUp(event) {
                triggerElement.style.cursor = "default"; //设置样式
                document.removeEventListener('mousemove', mouseMove, false) 
                document.removeEventListener('mouseup', mouseUp, false) 
            } // mouseUp end
        }, false)
    };
	
	/*来自于网友*/

拖动缩放例子

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
       
        
        .sq-out {
            text-align: center;
            position: relative;
            display: inline-block;
            border: 1px solid #aaa;
            height: 500px;
            width: 500px;
        }
        
        .sq {
            display: inline-block;
            position: absolute;
            /* position: relative; */
            border: 1px solid #666;
            /* min-width: 20px; */
            /* min-height: 20px; */
        }
        
        .triggerElement {
            position: absolute;
            top: 0;
            left: 0;
            bottom: 0;
            right: 0;
        }
        
        .sq>div:not(.trigger-element) {
            position: absolute;
            /* position: relative; */
            height: 5px;
            width: 5px;
            outline: 1px solid #666;
            background: white;
        }
        
        .trigger-element {
            position: absolute;
            top: 0;
            left: 0;
            bottom: 0;
            right: 0;
        }
        
        .tl {
            top: -3px;
            left: -3px;
            cursor: nw-resize;
        }
        
        .tr {
            top: -3px;
            right: -3px;
            cursor: ne-resize;
        }
        
        .bl {
            bottom: -3px;
            left: -3px;
            cursor: ne-resize;
        }
        
        .br {
            bottom: -3px;
            right: -3px;
            cursor: nw-resize;
        }
    </style>
</head>

<body>
    <div class="sq-out">
        <div class="sq">
            <div class="tl"></div>
            <div class="tr"></div>
            <div class="bl"></div>
            <div class="br"></div>
            <div class="trigger-element"></div>
        </div>
    </div>
    <script>
        var sqout = document.getElementsByClassName("sq-out")[0];
        var triggerElement = document.getElementsByClassName("trigger-element")[0];
        var sq = document.getElementsByClassName("sq")[0];
        var tl = document.getElementsByClassName("tl")[0];
        var tr = document.getElementsByClassName("tr")[0];
        var bl = document.getElementsByClassName("bl")[0];
        var br = document.getElementsByClassName("br")[0];

        startDrag(triggerElement, sq);
        startDrag(br, br, "br");
        startDrag(bl, bl, "bl");
        startDrag(tl, tl, "tl");
        startDrag(tr, tr, "tr");

        initPostion();

        function initPostion() { //初始化
            sq.style.top = "20px";
            sq.style.left = "20px";
            sq.style.bottom = "20px";
            sq.style.right = "20px";
        }

        function startDrag(triggerElement, targetElement, position) { //定义拖动事件
            triggerElement.addEventListener('mousedown', function(event) { //按下添加鼠标移动和放下事件
                document.addEventListener('mousemove', mouseMove, false) 
                document.addEventListener('mouseup', mouseUp, false) 
                var originMouseX, originMouseY, moveX, moveY; //鼠标xy坐标，鼠标移动多少
                originMouseX = event.clientX;
                originMouseY = event.clientY;

                function mouseMove(event) {
                    moveX = event.clientX - originMouseX; ///移动
                    moveY = event.clientY - originMouseY;
                    originMouseX = event.clientX;
                    originMouseY = event.clientY;

                    if (position == "tl") {
                        sq.style.top = (Number.parseInt(sq.style.top) + moveY) + "px";
                        sq.style.left = (Number.parseInt(sq.style.left) + moveX) + "px";
                    } else if (position == "tr") {
                        console.log(position);
                        sq.style.top = (Number.parseInt(sq.style.top) + moveY) + "px";
                        sq.style.right = (Number.parseInt(sq.style.right) - moveX) + "px";
                    } else if (position == "br") {
                        console.log(position);
                        sq.style.bottom = (Number.parseInt(sq.style.bottom) - moveY) + "px";
                        sq.style.right = (Number.parseInt(sq.style.right) - moveX) + "px";
                    } else if (position == "bl") {
                        console.log(position);
                        sq.style.bottom = (Number.parseInt(sq.style.bottom) - moveY) + "px";
                        sq.style.left = (Number.parseInt(sq.style.left) + moveX) + "px";
                    } else {
                        if (!((Number.parseInt(targetElement.style.bottom) - moveY) < 0) && !(moveY + targetElement.offsetTop < 0)) {
                            targetElement.style.top = ((moveY + targetElement.offsetTop)) + 'px'
                            targetElement.style.bottom = (Number.parseInt(targetElement.style.bottom) - moveY) + "px"
                        }
                        if (!((moveX + targetElement.offsetLeft) < 0) && !((Number.parseInt(targetElement.style.right) - moveX) < 0)) {
                            targetElement.style.right = (Number.parseInt(targetElement.style.right) - moveX) + "px"
                            targetElement.style.left = ((moveX + targetElement.offsetLeft)) + 'px' //移动的距离加原来的距离
                        }
                    }

                    // 防止选取文字
                    event.preventDefault();
                    triggerElement.onselectstart = function() {
                        return false;
                    }

                } // mouseMove end
                function mouseUp(event) {
                    document.removeEventListener('mousemove', mouseMove, false)
                    document.removeEventListener('mouseup', mouseUp, false)
                } // mouseUp end
            }, false)
        };
    </script>
</body>

</html>

为元素添加拖动事件（含例子）

本文地址：https://blog.csdn.net/qq_39121810/article/details/107338737

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