Question

我的小提琴目前有1个可拖动的项目

https://jsfiddle.net/wayneker/yfmh4kx6/4/

但我想总共添加71种不同形状的物品。我尝试添加<div id="draggable-element"></div>，但我无法移动它。十字准线显示但不能移动它。我知道我将不得不为不同的形状添加不同的类，但我想我会首先尝试使用几个项目。我还需要了解可拖动物品的起始位置。

var selected = null, // Object of the element to be moved
    x_pos = 0, y_pos = 0, // Stores x & y coordinates of the mouse pointer
    x_elem = 0, y_elem = 0; // Stores top, left values (edge) of the element

// Will be called when user starts dragging an element
function _drag_init(elem) {
    // Store the object of the element which needs to be moved
    selected = elem;
    x_elem = x_pos - selected.offsetLeft;
    y_elem = y_pos - selected.offsetTop;
}

// Will be called when user dragging an element
function _move_elem(e) {
    x_pos = document.all ? window.event.clientX : e.pageX;
    y_pos = document.all ? window.event.clientY : e.pageY;
    if (selected !== null) {
        selected.style.left = (x_pos - x_elem) + 'px';
        selected.style.top = (y_pos - y_elem) + 'px';
    }
}

// Destroy the object when we are done
function _destroy() {
    selected = null;
}

// Bind the functions...
document.getElementById('draggable-element').onmousedown = function () {
    _drag_init(this);
    return false;
};

document.onmousemove = _move_elem;
document.onmouseup = _destroy;

Answer 1

将draggable-element设为class，您可以将其应用于多个元素。此时，使用onmousedown将getElementsByClassName()函数绑定到类的所有元素。

以下是更新的示例：https://jsfiddle.net/WordyTheByrd/zjq6h5Lo/

可拖动的项目问题

1 个答案: