Я использую пример складного дерева d3.js. Мне удалось загрузить внешние данные json при щелчке узла. Теперь я хочу показать изображение предварительной загрузки до тех пор, пока данные json не будут получены с сервера рядом с соответствующим узлом, где я щелкнул.
Я добавил тег div во все узлы и имел img src для gif во всех добавленных тегах div. Я не мог добиться решения.
Ниже мой пример кода:
<!DOCTYPE html>
<html>
<title>Gateways - CollapsibleTree</title>
<meta charset="utf-8">
<style>
.node {
cursor: pointer;
}
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 1.5px;
}
.node text {
font: 12px sans-serif;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 1.5px;
}
a:hover {
text-decoration:underline
}
</style>
<body>
<script src="d3.min.js"></script>
<script src="jquery.min.js"></script>
<script>
var margin = {
top: 20,
right: 120,
bottom: 20,
left: 120
},
width = 960 - margin.right - margin.left,
height = 800 - margin.top - margin.bottom;
var i = 0,
duration = 750,
root;
var tree = d3.layout.tree()
.size([height, width]);
var diagonal = d3.svg.diagonal()
.projection(function(d) {
return [d.y, d.x];
});
var svg = d3.select("body").append("svg")
.attr("id", "treeChart")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.json("http://localhost:8080/demo/gateways.json", function(error, flare) {
root = flare;
root.x0 = height / 2;
root.y0 = 0;
function collapse(d) {
if (d.children) {
d._children = d.children;
d._children.forEach(collapse);
d.children = null;
}
}
root.children.forEach(collapse);
update(root);
});
d3.select(self.frameElement).style("height", "800px");
function update(source) {
$('div#loading1').hide();
// Compute the new tree layout.
var nodes = tree.nodes(root).reverse(),
links = tree.links(nodes);
// Normalize for fixed-depth.
nodes.forEach(function(d) {
d.y = d.depth * 180;
});
// Update the nodes…
var node = svg.selectAll("g.node")
.data(nodes, function(d) {
return d.id || (d.id = ++i);
});
// Enter any new nodes 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", click);
nodeEnter.append("circle")
.attr("r", 15)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});
nodeEnter.append("svg:image")
.attr("class", "circle")
.attr("xlink:href", "logo.png")
.attr("x", "-8px")
.attr("y", "-8px")
.attr("width", "16px")
.attr("height", "16px");
var z = 0,
z2 = 0;
var spinner = nodeEnter.append("div")
.attr("top", function(d) {
return "15%";
})
.attr("left", function(d) {
return "50%";
})
.attr("width", "16px")
.attr("height", "16px")
.attr("position", "absolute")
.attr("id", function(d) {
return "loading" + z++;
});
var spinimage = spinner.append("img")
.attr("src", "loading.GIF")
.attr("alt", "Processing");
nodeEnter.append("a")
.attr("xlink:href", function(d) {
return d.url;
})
.append("text")
.attr("x", function(d) {
return d.children || d._children ? -10 : 10;
})
.attr("dy", ".35em")
.attr("text-anchor", function(d) {
return d.children || d._children ? "end" : "start";
})
.text(function(d) {
return d.name;
})
.style("fill-opacity", 1e-6);
// Transition nodes to their new position.
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + d.y + "," + d.x + ")";
});
nodeUpdate.select("circle")
.attr("r", 4.5)
.style("fill", function(d) {
return d._children || d.children ? "lightsteelblue" : "#fff";
});
nodeUpdate.select("text")
.style("fill-opacity", 1);
// Transition exiting nodes to the parent's new position.
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + source.y + "," + source.x + ")";
})
.remove();
nodeExit.select("circle")
.attr("r", 1e-6);
nodeExit.select("text")
.style("fill-opacity", 1e-6);
// Update the links…
var link = svg.selectAll("path.link")
.data(links, function(d) {
return d.target.id;
});
// Enter any new links at the parent's previous position.
link.enter().insert("path", "g")
.attr("class", "link")
.attr("d", function(d) {
var o = {
x: source.x0,
y: source.y0
};
return diagonal({
source: o,
target: o
});
});
// Transition links to their new position.
link.transition()
.duration(duration)
.attr("d", diagonal);
// Transition exiting nodes to the parent's new position.
link.exit().transition()
.duration(duration)
.attr("d", function(d) {
var o = {
x: source.x,
y: source.y
};
return diagonal({
source: o,
target: o
});
})
.remove();
// Stash the old positions for transition.
nodes.forEach(function(d) {
d.x0 = d.x;
d.y0 = d.y;
});
}
// Toggle children on click.
function click(d) {
$('div#loading1').show();
// made a time out to check the preload
setTimeout(function() {
$.getJSON("http://localhost:8080/demo/gateways.json", function(addJson) {
// on node click get whole json data and parse the data and apppend children of the
//corresponding parent
var childObj = getObjects(addJson, 'name', d.name);
var len = (childObj[0].children).length;
function collapse2(k) {
if (k.children) {
k._children = k.children;
k._children.forEach(collapse2);
k.children = null;
}
}
childObj[0].children.forEach(collapse2);
var newnodes = tree.nodes(childObj[0].children).reverse();
if (d.children) {
d._children = newnodes[0];
d.children = null;
} else {
d.children = newnodes[0];
d._children = null;
}
update(d);
});
//do something special
}, 3000);
}
function getObjects(obj, key, val) {
var objects = [];
for (var i in obj) {
if (!obj.hasOwnProperty(i)) continue;
if (typeof obj[i] == 'object') {
objects = objects.concat(getObjects(obj[i], key, val));
} else if (i == key && obj[key] == val) {
objects.push(obj);
}
}
return objects;
}
</script>
</body>
</html>
