Cara dapatkan JavaScript Draggable

Membuat elemen HTML menjadi bisa digeser-geser ternyata jauh lebih mudah dibandingkan dengan apa yang Saya pikir selama ini. Fungsi di bawah ini murni menggunakan JavaScript biasa dan tidak memerlukan library apapun. Berbeda dengan plugin draggable buatan Saya yang dulu:

HTML

1<div id="draggable-element" style="position:relative;">Drag me!</ddiv>

JavaScript

12345678910111213141516171819202122232425262728293031323334var 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) {
    selected = elem; // Store the object of the element which needs to be moved
    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 here...
document.getElementById('draggable-element').onmousedown = function() {
    _drag_init(this);
    return false;
};

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

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Posted by Unknown, Published at 19.26 and have 0 komentar