Attach a click event handler to a D3 element

Upon loading the page, the nodeClick() method is called without any clicking action. How can I adjust it so that the nodeClick() function is only triggered when I click on the element?

Here is the code snippet:

var node = svg.selectAll(".node")
    .on("click", nodeClick());

set within this context:

var width = 960,
   height = 500;

var color = d3.scale.category10();

var nodes = [],
    links = [];

var force = d3.layout.force()
    .nodes(nodes)
    .links(links)
    .charge(-400)
    .linkDistance(120)
    .size([width, height])
    .on("tick", tick);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var node = svg.selectAll(".node")
    .on("click", nodeClick()),
    link = svg.selectAll(".link");

function start() {
    link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; });
    link.enter().insert("line", ".node").attr("class", "link");
    link.exit().remove();

    node = node.data(force.nodes(), function(d) { return d.id;});
    node.enter().append("circle").attr("class", function(d) { return "node " + d.id; }).attr("r", 8);
    node.exit().remove();

    force.start();
}

function nodeClick() {
    console.log("ASDASDASD");
}

function tick() {
    node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; })

    link.attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });
}

Answer №1

Make sure not to mistakenly call the function when setting up the click handler. Instead, attach a function to the handler that will execute the desired function:

.on("click", function() { performClickAction() });

Alternatively, you can simply pass the function name without executing it (more concise):

.on("click", performClickAction);

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