D3js-對柱狀圖的增，刪，排序

時間 2019-11-17

原文原文鏈接

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>D3 添加刪除排序柱狀圖</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<script type="text/javascript" src="js/d3/d3.js"></script>
<script type="text/javascript" src="js/d3/d3.min.js"></script>

<script type="text/javascript">

//定義變量
var width =1000;
var height=600;

var dataset=[];

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

for(var i=0;i<5;i++)
{
dataset[i]=Math.floor(Math.random()*100);
}

console.log(dataset);
//外邊框
var padding={top:20,right:20,bottom:20,left:20};
//矩形寬度包含空白
var rectStep=35;
//矩形寬度不包含空白
var rectWidth=30;

//繪製矩形
function draw()
{
//1-----------------------------------
//獲取矩形updata部分
var updateRect = svg.selectAll("rect")
.data(dataset);

//獲取矩形的enter部分
var enterRect =updateRect.enter();

//獲取矩形的exit部分
var exitRect =updateRect.exit();

//獲取矩形update方法的處理
updateRect.attr("fill","steelblue")
//矩形座標
.attr("x",function(d,i)
{
return padding.left+i*rectStep;
})
.attr("y",function(d,i)
{
return height-padding.bottom-d;
})
//矩形的高寬
.attr("width",rectWidth)
.attr("height",function(d,i)
{
return d;
});
//獲取矩形 enter方法的處理
enterRect.append("rect")
.attr("fill","steelblue")
//矩形座標
.attr("x",function(d,i)
{
return padding.left+i*rectStep;
})
.attr("y",function(d,i)
{
return height-padding.bottom-d;
})
//矩形的高寬
.attr("width",rectWidth)
.attr("height",function(d,i)
{
return d;
});

//獲取矩形exit方法的處理
exitRect.remove();

//2--------------------------------------

//獲取文字update的處理
var updateText = svg.selectAll("text")
.data(dataset);

var enterText = updateText.enter();

var exitText = updateText.exit();

updateText.attr("fill","white")
.attr("font-size","14px")
.attr("text-anchor","middle")
.attr("x",function(d,i)
{
return padding.left+i*rectStep;
})
.attr("y",function(d,i)
{
return height-padding.bottom-d;
})
.attr("dx",rectWidth/2)
.attr("dy","1em")
.text(function(d,i)
{
return d;
});
enterText.append("text")
.attr("fill","white")
.attr("font-size","14px")
.attr("text-anchor","middle")
.attr("x",function(d,i)
{
return padding.left+i*rectStep;
})
.attr("y",function(d,i)
{
return height-padding.bottom-d;
})
.attr("dx",rectWidth/2)
.attr("dy","1em")
.text(function(d,i)
{
return d;
});

exitText.remove();
}

//調用畫圖函數
draw();

//排序
function sortData()
{
dataset.sort(d3.ascending);
draw();
}

//添加
function addData()
{
dataset.push(Math.floor(Math.random()*100));
draw();
}
//刪除
function deleteData()
{
//選中所有條
dataset.shift();
var bars = svg.selectAll("rect")
.data(dataset);

bars.exit()
.remove();
draw();
}
</script>

<br/>
<div>
<button type="button" onclick="sortData()">排序</button>
<button type="button" onclick="addData()">添加</button>
<button type="button" onclick="deleteData()">刪除</button>

</div>
</body>

</html>javascript

參考站點：http://www.ourd3js.com/wordpress/?p=841css

http://blog.csdn.net/tianxuzhang/article/details/14086627
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