zoom jumps when using mouse after zoom In/out - d3.js

Question

I am Trying to display my full svg tree within the display in a center view.
var svg = d3.select("body").append("svg")
.call(d3.zoom().on("zoom", function () {
svg.attr("transform", d3.event.transform);
})).on("dblclick.zoom", null)
.attr("width", "1000")
.attr("height",590)
.append("g")
svg.attr("transform",function(d) {
return "translate(" + 450 + "," + svgHeight + ") scale(" + scale + ")";
} );
I am adjusting the scale and height properties of the transform depends on the number of nodes, actually its working fine.
The problem is when I am trying to zoom in/out on the tree for the first time , its not zooming the focused node.
This occurs only when I am doing zoom for first time, from second time its zooming the pointing node.
This is what I tried so far : Codepen

Answer 1

A drawback of the otherwise solid solution #soundquiet posted is that it disrupts panning behaviour, leading to some sort of rapid shifting of the nodes.
A simpler, and more robust solution is shown below. I just wrap the g-element inside another g element called zoomContainer and call all zoom behaviour on that instead.
var treeData = {
"name": "Share point Server 2019",
"id": "a093F0000078Id5QAE",
"children": [{
"name": "is extended by",
"level": "sub node",
"children": [{
"name": "Share point Server 2019",
"id": "a093F0000078Id5QAE"
}]
}, {
"name": "manages",
"level": "sub node",
"children": [{
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}, {
"name": "HPE ProLiant ML350 Tower",
"id": "a093F0000078IcHQAU"
}]
}, {
"name": "is operated by",
"level": "sub node",
"children": [{
"name": "Power point SH-20",
"id": "a093F00000794ZWQAY"
}]
}]
};
var scale = 1,
svgHeight = 200,
nodeCount = 13;;
var margin = {
top: 20,
right: 90,
bottom: 30,
left: 90
},
width = window.outerWidth,
height = window.outerHeight;
var focused = false;
console.log('scale', scale)
var zoomContainer = d3.select("body").append("svg")
.call(d3.zoom().on("zoom", function() {
zoomContainer.attr("transform", d3.event.transform);
})).on("dblclick.zoom", null)
.attr("width", "1000")
.attr("height", 590)
.append("g")
var svg = zoomContainer
.append("g")
.attr("transform", function(d) {
return "translate(" +
(450) + "," + (svgHeight) + ") scale(" + scale + ")";
});
var i = 0,
duration = 750,
root;
// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);
// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) {
return d.children;
});
root.x0 = height;
root.y0 = 0;
// Collapse after the second level
if (typeof collapse === 'undefined')
root.children.forEach(collapse);
update(root);
// Collapse the node and all it's children
function collapse(d) {
if (d.children) {
d._children = d.children
d._children.forEach(collapse)
d.children = null
}
}
function update(source) {
// Assigns the x and y position for the nodes
var treeData = treemap(root);
// Compute the new tree layout.
var nodes = treeData.descendants(),
links = treeData.descendants().slice(1);
let left = root;
let right = root;
var dx = ((nodeCount * 18) / 1000);
// Normalize for fixed-depth.
nodes.forEach(function(d, index) {
d.y = d.depth * 180;
d.x = d.x * ((nodeCount * 18) / 1000);
});
// ****************** Nodes section ***************************
// Update the nodes...
var node = svg.selectAll('g.node')
.data(nodes, function(d) {
return d.id || (d.id = ++i);
});
// Enter any new modes at the parent's previous position.
var nodeEnter = node.enter().append('g')
.attr('class', 'node')
.attr("transform", function(d) {
return "translate(" + (source.y0) + "," + (source.x0) + ")";
})
.on('click', d => {
// d3.event.preventDefault();
component.set("v.nodeName", d.data.name);
})
.on("dblclick", click);
// Add Circle for the nodes
nodeEnter.append('circle')
.attr('class', 'node')
.attr('r', 1e-6)
.style('stroke', 'steelblue')
.style('stroke-width', '3px');
// Add labels for the nodes
nodeEnter.append('text')
.attr("dy", ".35em")
.attr("x", function(d) {
return d.children || d._children ? -13 : 13;
})
.attr("text-anchor", function(d) {
return d.children || d._children ? "end" : "start";
})
.text(function(d) {
return d.data.name;
});
// UPDATE
var nodeUpdate = nodeEnter.merge(node);
// Transition to the proper position for the node
nodeUpdate.transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + (d.y) + "," + (d.x) + ")";
});
// Update the node attributes and style
nodeUpdate.select('circle.node')
.attr('r', 3)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
})
.attr('cursor', 'pointer');
// Remove any exiting nodes
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + (source.y) + "," + source.x + ")";
})
.remove();
// On exit reduce the node circles size to 0
nodeExit.select('circle')
.attr('r', 1e-6);
// On exit reduce the opacity of text labels
nodeExit.select('text')
.style('fill-opacity', 1e-6);
// ****************** links section ***************************
// Update the links...
var link = svg.selectAll('path.link')
.data(links, function(d) {
return d.id;
});
// Enter any new links at the parent's previous position.
var linkEnter = link.enter().insert('path', "g")
.attr("class", "link")
.style('fill', "none")
.style('stroke', "#ccc")
.style('stroke-width', "2px")
.attr('d', function(d) {
var o = {
x: source.x0,
y: source.y0
}
return diagonal(o, o)
});
// UPDATE
var linkUpdate = linkEnter.merge(link);
// Transition back to the parent element position
linkUpdate.transition()
.duration(duration)
.attr('d', function(d) {
return diagonal(d, d.parent)
});
// Remove any exiting links
var linkExit = link.exit().transition()
.duration(duration)
.attr('d', function(d) {
var o = {
x: source.x,
y: source.y
}
return diagonal(o, o)
})
.remove();
// Store the old positions for transition.
nodes.forEach(function(d) {
d.x0 = d.x;
d.y0 = d.y;
});
// Creates a curved (diagonal) path from parent to the child nodes
function diagonal(s, d) {
var path = "M" + d.y + "," + d.x +
"C" + (d.y + s.y) / 2 + "," + d.x +
" " + (d.y + s.y) / 2 + "," + s.x +
" " + s.y + "," + s.x;
return path;
}
// Toggle children on click.
function click(d) {
}
}
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