[英]How to export/save updated d3.js v4 tree json data string
我正在使用以下代码:
https://bl.ocks.org/adamfeuer/042bfa0dde0059e2b288
并且正在加载一个非常简单的 json 字符串来创建树:
{
"name": "flare",
"children": [{
"name": "analytics"
}, {
"name": "animate"
}]
}
所以我想弄清楚的是,在我向“flare”节点添加一个新的子节点(例如)之后,我如何创建一个更新的 json 字符串以保存新添加的节点?
添加新节点后更新的 json 示例如下:
{
"name": "flare",
"children": [{
"name": "analytics"
}, {
"name": "animate"
}, {
"name": "NEW NODE"
}]
}
是否有一些我没有找到的内置功能? 还是必须构建自定义函数? 如果我需要一个自定义函数,有人可以指出我正确的方向吗? 非常感谢!
我提出的这个解决方案并不完美,值得改进,但有效,它将帮助您入门。
下面的所有代码都添加在 dndTree.js 文件中更新函数的末尾。
console.log(root); //root contains everything you need
const getCircularReplacer = (deletePorperties) => { //func that allows a circular json to be stringified
const seen = new WeakSet();
return (key, value) => {
if (typeof value === "object" && value !== null) {
if(deletePorperties){
delete value.id; //delete all properties you don't want in your json (not very convenient but a good temporary solution)
delete value.x0;
delete value.y0;
delete value.y;
delete value.x;
delete value.depth;
delete value.size;
}
if (seen.has(value)) {
return;
}
seen.add(value);
}
return value;
};
};
var myRoot = JSON.stringify(root, getCircularReplacer(false)); //Stringify a first time to clone the root object (it's allow you to delete properties you don't want to save)
var myvar= JSON.parse(myRoot);
myvar= JSON.stringify(myvar, getCircularReplacer(true)); //Stringify a second time to delete the propeties you don't need
console.log(myvar); //You have your json in myvar
现在你有了你的 json,你可以:
下载您的新 tree.json 文件:
function download(content, fileName, contentType) { var a = document.createElement("a"); var file = new Blob([content], { type: contentType }); a.href = URL.createObjectURL(file); a.download = fileName; a.click(); } download(myvar, 'tree.json', 'text/plain');
或者你可以直接写在你的文件中。
node.js 的一个例子:
var fs = require('fs');
fs.writeFile("tree.json", myvar, function(err) {
if (err) {
console.log(err);
}
});
检查此以获取更多信息以保存文件: How do I save JSON to local text file
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