In jQuery how can I set “top,left” properties of an element with position values relative to the parent and not the document?

Question

.offset([coordinates]) method set the coordinates of an element but only relative to the document. Then how can I set coordinates of an element but relative to

Answer 1

Use offset() function of jQuery. Here it would be:

$container.offset({
        'left': 100,
        'top': mouse.y - ( event_state.mouse_y - event_state.container_top ) 
    });