How to set the Origin (drag.origin) for drag behavior in d3 JavaScript library

Question

I am trying to implement drag behavior for group consisting from HTML-text and background-rectangle using the d3 framework. I was able to get it working, although when not s

Answer 1

You simply need to set the origin() function accordingly. In the second case this is straightforward, in the first case somewhat more difficult because you are using coordinates as well as a transform. The basic pattern (for the second case) looks like this:

 .origin(function() { 
        var t = d3.select(this);
        return {x: t.attr("x"), y: t.attr("y")};
    })

Updated jsfiddle here.

Answer 2

group element has no x/y attributes - no problem! create ones:

var node = svg.append("g")
            .attr('x',x_1)
            .attr('y',y_1)
            .attr("class","node")
            .attr("name","Node_A")
            .attr("transform","translate(" + x_1 + ", " + y_1 +")")
            .call(drag);

when, the .origin function from Lars will work

and dont forget to update x,y attributes, while dragging:

function dragged() {

    d3.select(this).attr("transform","translate(" + d3.event.x + ", " + d3.event.y +")");
    d3.select(this).attr("x",d3.event.x);
    d3.select(this).attr("y",d3.event.y);
}