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腳本在本地不起作用,但在服務器上起作用

[英]Script does not work locally but does on server

我剛剛開始使用javascript,好吧,我被卡住了,這也很令人尷尬。

首先,我嘗試加載一個無效的本地json文件。 我發現這很快。

但是,當我修復這個錯誤時,它仍然無法正常工作。

我所擁有的基本上是http://bl.ocks.org/mbostock/4339083的副本,它可以在我的瀏覽器中運行,而我的嘗試卻沒有。

現在我有兩個文件:

data.js

var json =
{
    "name":"flare",
    "children":
    [
...

這樣我就可以在不需要網絡服務器的情況下准備好我的json

我有一個帶腳本的html文件:

<!DOCTYPE html>
<meta charset="utf-8">
<style>

    .node {
        cursor: pointer;
    }

    .node circle {
        fill: #fff;
        stroke: steelblue;
        stroke-width: 1.5px;
    }

    .node text {
        font: 10px sans-serif;
    }

    .link {
        fill: none;
        stroke: #ccc;
        stroke-width: 1.5px;
    }

</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="data.js"></script>
<script>
    alert("here");

    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("width", width + margin.right + margin.left)
            .attr("height", height + margin.top + margin.bottom)
            .append("g")
            .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    alert("there");

    d3.json(json, function(error, flare) {
        if (error) throw error;

        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) {

        // 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", 1e-6)
                .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

        nodeEnter.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 ? "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) {
        if (d.children) {
            d._children = d.children;
            d.children = null;
        } else {
            d.children = d._children;
            d._children = null;
        }
        update(d);
    }

</script>

你可以看到它現在基本上是一個1:1的副本。

當我打開.html文件時,我的頁面保持空白。

怎么會這樣? 我理解如果我嘗試通過d3.json加載本地d3.json文件會發生這種情況,因為這會嘗試執行http請求,如果沒有Web服務器來處理它就會失敗。

但是現在json數據被保存在變量中,這種行為對我來說毫無意義。

請賜教! 我現在試圖解決這個問題。

替換這個:

d3.json(json, function(error, flare) {
    if (error) throw error;

    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);
});

有了這個:

var flare = json;

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.json(url[, callback])使用默認的mime類型application/json在指定的URL上創建對JSON文件的請求。 在您的代碼中,您傳遞的是JSON對象而不是URL。 請試試這個:

d3.json(json, function(error, flare)

並將data.json json分配給root

//d3.json(json, function(error, flare) { <-- this will be removed
//if (error) throw error; <-- remove this too not needed !
root = json;
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);
//} <-- don't forget the closing brace.

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