D3 新手...
我正在尝试复制 simple example但是我的数据来自mysql。由于我将我的列重命名为“名称”和“大小”,因此应该很容易过渡。我相信 !d.children;
行/项目限制了要处理的数据,或者我的代码有误。
如何将类添加到现有的 .json?
或
我需要删除哪些代码才能使现有的 .json 正常工作?
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var diameter = 960,
format = d3.format(",d"),
color = d3.scale.category20c();
var bubble = d3.layout.pack()
.sort(null)
.size([diameter, diameter])
.padding(1.5);
var svg = d3.select("body").append("svg")
.attr("width", diameter)
.attr("height", diameter)
.attr("class", "bubble");
d3.json("json.php", function(error, root) {
var node = svg.selectAll(".node")
.data(bubble.nodes(classes(root))
.filter(function(d) { return !d.children; }))
.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
node.append("title")
.text(function(d) { return d.className + ": " + format(d.value); });
node.append("circle")
.attr("r", function(d) { return d.r; })
.style("fill", function(d) { return color(d.packageName); });
node.append("text")
.attr("dy", ".3em")
.style("text-anchor", "middle")
.text(function(d) { return d.className.substring(0, d.r / 3); });
});
// Returns a flattened hierarchy containing all leaf nodes under the root.
function classes(root) {
var classes = [];
function recurse(name, node) {
if (node.children) node.children.forEach(function(child) { recurse(node.name, child); });
else classes.push({packageName: name, className: node.name, value: node.size});
}
recurse(null, root);
return {children: classes};
}
d3.select(self.frameElement).style("height", diameter + "px");
</script>
json.php
<?php
$username = "homedbuser";
$password = "homedbuser";
$host = "localhost";
$database="homedb";
$server = mysql_connect($host, $username, $password);
$connection = mysql_select_db($database, $server);
$myquery = "
SELECT `name`, `size` FROM `lists`
";
$query = mysql_query($myquery);
if ( ! $myquery ) {
echo mysql_error();
die;
}
$data = array();
for ($x = 0; $x < mysql_num_rows($query); $x++) {
$data[] = mysql_fetch_assoc($query);
}
echo json_encode($data);
mysql_close($server);
?>
此外,我认为脚本中的 root
有错误(假设是数据)。我将继续根据我的研究更新代码,直到有响应为止。
最佳答案
您正在尝试的图表要求数据采用分层格式。对于您给出的查询,数据似乎没有层次结构。
我使用了 csv 数据,但没关系,我已经为您在链接中提供的图表提供了我使用的格式。
编写您的 SQL 查询以获取以下格式的数据并使用 d3.json 并导入 php 文件,一切都应该工作正常。
我已经粘贴了所有代码和示例数据。
这可能对您有所帮助。任何问题也请提供示例数据。
数据:
name,size level1,23 level1,23 level1,23 level1,23 level1,23 level1,23 level1,23 level1,23 level1,23 level2,23 level2,23 level2,23 level2,23 level2,23 level2,23 level2,23 level2,23 level2,23
用于转换为层次结构的函数:
d3.csv("data.csv", function(root) { var newData = { name :"root", children : [] }, levels = ["name"]; // For each data row, loop through the expected levels traversing the output tree root.forEach(function(d){ // Keep this as a reference to the current level var depthCursor = newData.children; // Go down one level at a time levels.forEach(function( property, depth ){ // Look to see if a branch has already been created var index; depthCursor.forEach(function(child,i){ if ( d[property] == child.name ) index = i; }); // Add a branch if it isn't there if ( isNaN(index) ) { depthCursor.push({ name : d[property], children : []}); index = depthCursor.length - 1; } // Now reference the new child array as we go deeper into the tree depthCursor = depthCursor[index].children; // This is a leaf, so add the last element to the specified branch if ( depth === levels.length - 1 ) depthCursor.push({ name : d.name, size : d.size }); }); }); //Print what we've got d3.select('body').append('pre') .text(JSON.stringify(newData, null, ' ')); })
结合这两个功能的脚本:
var diameter = 960, format = d3.format(",d"), color = d3.scale.category20c(); var bubble = d3.layout.pack() .sort(null) .size([diameter, diameter]) .padding(1.5); var svg = d3.select("body").append("svg") .attr("width", diameter) .attr("height", diameter) .attr("class", "bubble"); d3.json("yourphpfile.php", function(error, data) { var root = { name :"root", children : [] }, levels = ["name"]; // For each data row, loop through the expected levels traversing the output tree data.forEach(function(d){ // Keep this as a reference to the current level var depthCursor = root.children; // Go down one level at a time levels.forEach(function( property, depth ){ // Look to see if a branch has already been created var index; depthCursor.forEach(function(child,i){ if ( d[property] == child.name ) index = i; }); // Add a branch if it isn't there if ( isNaN(index) ) { depthCursor.push({ name : d[property], children : []}); index = depthCursor.length - 1; } // Now reference the new child array as we go deeper into the tree depthCursor = depthCursor[index].children; // This is a leaf, so add the last element to the specified branch if ( depth === levels.length - 1 ) depthCursor.push({ name : d.name, size : d.size }); }); }); var node = svg.selectAll(".node") .data(bubble.nodes(classes(root)) .filter(function(d) { return !d.children; })) .enter().append("g") .attr("class", "node") .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); node.append("title") .text(function(d) { return d.className + ": " + format(d.value); }); node.append("circle") .attr("r", function(d) { return d.r; }) .style("fill", function(d) { return color(d.packageName); }); node.append("text") .attr("dy", ".3em") .style("text-anchor", "middle") .text(function(d) { return d.className.substring(0, d.r / 3); }); }); // Returns a flattened hierarchy containing all leaf nodes under the root. function classes(root) { var classes = []; function recurse(name, node) { if (node.children) node.children.forEach(function(child) { recurse(node.name, child); }); else classes.push({packageName: name, className: node.name, value: node.size}); } recurse(null, root); return {children: classes}; } d3.select(self.frameElement).style("height", diameter + "px");
关于javascript - Mysql to JSON to D3js no Visual... "class"识别错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19995049/