Hope you guys are doing okay.
I am working on a line graph from Apex Charts and every thing seems to be working fine except one issue.
The lines cross-over/overflows on the y axes whereas they are supposed to stay between the y axes. I have tried adding offsetX to almost everything but it just doesn't seem to work.
What is it that I am doing wrong here? How can I fix it?
Here's CODEPEN.
Here's an image of the issue:
Here's the snippet:
const lineChartEl = document.querySelector('#line-chart');
const lineChartOptions = {
chart: {
height: '380',
width: "100%",
type: "line",
dropShadow: {
enabled: true,
enabledOnSeries: undefined,
top: 0,
left: 0,
blur: 3,
color: '#000',
opacity: 0.35
},
foreColor: 'red', // numbers color
toolbar: {
show: true,
offsetX: -30,
offsetY: 0,
tools: {
download: true,
selection: true,
zoom: false,
zoomin: false,
zoomout: false,
pan: false,
reset: true | '<img src="/static/icons/reset.png" width="20">',
customIcons: []
},
export: {
csv: {
filename: 'data',
columnDelimiter: ',',
headerCategory: 'category',
headerValue: 'value',
dateFormatter(timestamp) {
return new Date(timestamp).toDateString()
}
},
svg: {
filename: 'data',
},
png: {
filename: 'data',
}
}
},
autoSelected: 'zoom'
},
legend: {
position: 'top'
},
grid: {
show: true,
padding: {
left: 0,
right: 0
},
borderColor: "rgba(0,0,0,0.1)"
},
colors: ['red', 'blue', 'yellow'],
stroke: {
width: 2,
},
tooltip: {
theme: "dark"
},
series: [{
name: "Cost",
data: [0, 1042, 2120, 3340, 4013, 5012, 6750, 7520, 8055, 9210]
},
{
name: "Revenue",
data: [1131, 2311, 3143, 4565, 6012, 7750, 8520, 9055, 10210, 7530]
},
{
name: "Profit %",
data: [2, 5, 3, 4, 6, 3.4, 2.2, 5.2, 1.3, 3.8]
}
],
yaxis: [{
title: {
text: "Cost / Revenue"
},
seriesName: "Cost",
tickAmount: 5,
axisBorder: {
show: true,
color: 'red'
},
axisTicks: {
show: true,
color: 'blue'
},
crosshairs: {
show: true,
position: 'back',
stroke: {
color: '#b6b6b6',
width: 1,
dashArray: 0,
},
},
tooltip: {
enabled: true,
offsetX: 0,
},
},
{
title: {
text: "Kilograms"
},
seriesName: "Weight 1",
show: false
},
{
title: {
text: "Profit %"
},
opposite: true,
tickAmount: 5,
seriesName: "Profit %",
axisBorder: {
show: true,
color: 'red'
},
axisTicks: {
show: true,
color: 'blue'
},
crosshairs: {
show: true,
position: 'back',
stroke: {
color: '#b6b6b6',
width: 1,
dashArray: 0,
},
},
tooltip: {
enabled: true,
offsetX: 0,
},
},
],
xaxis: {
tickPlacement: 'on',
axisBorder: {
color: 'red',
},
axisTicks: {
color: 'blue',
},
tooltip: {
enabled: false,
}
},
};
const lineChart = new ApexCharts(lineChartEl, lineChartOptions);
lineChart.render();
<script src="https://cdnjs.cloudflare.com/ajax/libs/apexcharts/3.27.3/apexcharts.min.js"></script>
<div id="line-chart"></div>
You can fix it by removing padding inside grid options:
const lineChartEl = document.querySelector('#line-chart');
const lineChartOptions = {
chart: {
height: '380',
width: "100%",
type: "line",
dropShadow: {
enabled: true,
enabledOnSeries: undefined,
top: 0,
left: 0,
blur: 3,
color: '#000',
opacity: 0.35
},
foreColor: 'red', // numbers color
toolbar: {
show: true,
offsetX: -30,
offsetY: 0,
tools: {
download: true,
selection: true,
zoom: false,
zoomin: false,
zoomout: false,
pan: false,
reset: true | '<img src="/static/icons/reset.png" width="20">',
customIcons: []
},
export: {
csv: {
filename: 'data',
columnDelimiter: ',',
headerCategory: 'category',
headerValue: 'value',
dateFormatter(timestamp) {
return new Date(timestamp).toDateString()
}
},
svg: {
filename: 'data',
},
png: {
filename: 'data',
}
}
},
autoSelected: 'zoom'
},
legend: {
position: 'top'
},
grid: {
show: true,
borderColor: "rgba(0,0,0,0.1)"
},
colors: ['red', 'blue', 'yellow'],
stroke: {
width: 2,
},
tooltip: {
theme: "dark"
},
series: [{
name: "Cost",
data: [0, 1042, 2120, 3340, 4013, 5012, 6750, 7520, 8055, 9210]
},
{
name: "Revenue",
data: [1131, 2311, 3143, 4565, 6012, 7750, 8520, 9055, 10210, 7530]
},
{
name: "Profit %",
data: [2, 5, 3, 4, 6, 3.4, 2.2, 5.2, 1.3, 3.8]
}
],
yaxis: [{
title: {
text: "Cost / Revenue"
},
seriesName: "Cost",
tickAmount: 5,
axisBorder: {
show: true,
color: 'red'
},
axisTicks: {
show: true,
color: 'blue'
},
crosshairs: {
show: true,
position: 'back',
stroke: {
color: '#b6b6b6',
width: 1,
dashArray: 0,
},
},
tooltip: {
enabled: true,
offsetX: 0,
},
},
{
title: {
text: "Kilograms"
},
seriesName: "Weight 1",
show: false
},
{
title: {
text: "Profit %"
},
opposite: true,
tickAmount: 5,
seriesName: "Profit %",
axisBorder: {
show: true,
color: 'red'
},
axisTicks: {
show: true,
color: 'blue'
},
crosshairs: {
show: true,
position: 'back',
stroke: {
color: '#b6b6b6',
width: 1,
dashArray: 0,
},
},
tooltip: {
enabled: true,
offsetX: 0,
},
},
],
xaxis: {
tickPlacement: 'on',
axisBorder: {
color: 'red',
},
axisTicks: {
color: 'blue',
},
tooltip: {
enabled: false,
}
},
};
const lineChart = new ApexCharts(lineChartEl, lineChartOptions);
lineChart.render();
<script src="https://cdnjs.cloudflare.com/ajax/libs/apexcharts/3.27.3/apexcharts.min.js"></script>
<div id="line-chart"></div>
Related
I am trying to get both lines on my chart to scale correctly, I have read through the documentation but can't seem to find how to do this.
images
The above image shows what happens to the orange line when a secondary axis is added. It's like they are using the same scale rather than their own.
I currently have the below code:
$(function(e) {
/*-----echart1-----*/
var options = {
chart: {
height: 300,
type: "line",
stacked: false,
toolbar: {
enabled: false
},
dropShadow: {
enabled: true,
opacity: 0.1,
},
},
colors: ["#f99433", '#6759C8'],
dataLabels: {
enabled: false
},
stroke: {
curve: "straight",
width: [3, 3, 0],
dashArray: [0, 4],
lineCap: "round"
},
grid: {
padding: {
left: 0,
right: 0
},
strokeDashArray: 3
},
markers: {
size: 0,
hover: {
size: 0
}
},
series: [{
name: "Price",
type: 'line',
data: ["4.12","4.08","3.98","3.99","3.95","4.01"] }, {
name: "Socials",
type: 'line',
data: ["23","17","6","6","7","7"] }],
yaxis: [
{
title: {
text: "Price",
},
},
{
opposite: true,
title: {
text: "Socials"
}
}
],
xaxis: {
type: "month",
categories: ["2021-12-09 17:01:25","2021-12-09 18:01:29","2021-12-09 19:01:33","2021-12-09 20:01:37","2021-12-09 21:01:42","2021-12-09 22:01:45"],
axisBorder: {
show: false,
color: 'rgba(119, 119, 142, 0.08)',
},
labels: {
style: {
color: '#8492a6',
fontSize: '12px',
},
},
},
fill: {
gradient: {
inverseColors: false,
shade: 'light',
type: "vertical",
opacityFrom: 0.85,
opacityTo: 0.55
}
},
tooltip: {
show:false
},
legend: {
position: "top",
show:true
}
}
var chart = new ApexCharts(document.querySelector("#chartArea"), options);
chart.render();
I am working on page, where i need to have multiple plots, one being a solid gauge and the other being a line graph.
I am using the Ionic Framework 5 with angular and High Charts.
I am finding that when one plot is displayed, it works fine, but with more then one I am getting some type of conflict where the line chart does not get updated and the gauge gets data which is meant for the line graph.
This my code. Do i need to do anything in perticular?
particulate_plot() {
let particulte_chart = this.particulte_chart.stockChart('particulate_plot', {
chart: {
type: 'line',
animation: true,
backgroundColor: "#464340",
},
credits: {
enabled: false
},
legend: {
enabled: true,
layout: 'horizontal',
verticalAlign: 'bottom',
floating: false,
},
rangeSelector: {
selected: 1,
inputEnabled: false,
enabled: false
},
title: {
text: "Particulate Mass Concentration",
style: {
"color": "#f4f5f8",
"fontSize": "12px"
}
},
xAxis: {
type: 'datetime',
dateTimeLabelFormats: {
day: '%e of %b',
},
title: {
text: 'Date',
style: {
"color": "#f4f5f8",
"fontSize": "12px"
}
},
labels: {
style: {
"color": "#f4f5f8",
"fontSize": "12px"
}
}
},
yAxis: {
min: 0,
opposite: false,
title: {
text: "Mass \xb5g/m\xb3",
style: {
"color": "#f4f5f8",
"fontSize": "12px"
}
},
labels: {
formatter: function() {
return (this.value.toFixed(2) ? '' : '') + this.value.toFixed(2);
},
style: {
"color": "#f4f5f8",
"fontSize": "12px"
}
},
plotLines: [{
label: {
text: "EU Limit 40 \xb5g/m\xb3",
style: {
"color": "#f4f5f8",
"fontSize": "12px"
},
align: 'center',
y: -10,
},
color: 'red', // Color value
value: 3, // Value of where the line will appear
width: 5 // Width of the line
}],
},
navigator: {
enabled: false
},
scrollbar: {
enabled: false
},
series: [{
boostThreshold: 0,
color: '#FFF59D',
name: "PM1.0",
type: 'spline',
data: this.datasets[0].data,
showInNavigator: true,
visible: false,
lineWidth: 1,
},
{
boostThreshold: 0,
color: '#FFAB40',
name: "PM2.5",
type: 'spline',
data: this.datasets_b[0].data,
showInNavigator: true,
visible: true,
lineWidth: 1,
},
{
boostThreshold: 0,
color: '#90CAF9',
name: "PM4",
type: 'spline',
data: this.datasets_c[0].data,
showInNavigator: true,
visible: false,
lineWidth: 1,
},
{
boostThreshold: 0,
color: '#4DD0E1',
name: "PM10",
type: 'spline',
data: this.datasets_d[0].data,
showInNavigator: true,
visible: false,
lineWidth: 1,
}
],
"tooltip": {
"pointFormat": "<b>{point.y:.2f}</b>",
"shared": true
},
});
}
}
air_main_gauge() {
let maingauge_chart = this.maingauge_chart.stockChart('MainGuageA', {
chart: {
type: 'solidgauge',
backgroundColor: 'white',
},
credits: {
enabled: false
},
pane: {
center: ['50%', '50%'],
size: '100%',
innerSize: '10%',
startAngle: -150,
endAngle: 150,
background: {
backgroundColor: HighCharts.defaultOptions.legend.backgroundColor || '#EEE',
innerRadius: '85%',
outerRadius: '100%',
shape: 'arc'
}
},
lineWidth: 1,
tooltip: {
enabled: false
},
navigator: {
enabled: false
},
rangeSelector: {
selected: 1,
inputEnabled: false,
enabled: false
},
scrollbar: {
enabled: false
},
// the value axis
yAxis: {
min: 0,
max: 100,
// title: {
// text: 'Speed'
// },
stops: [
[0.1, '#55BF3B'], // green
[0.5, '#DDDF0D'], // yellow
[0.8, '#ed1f1f'] // red
],
minorTickInterval: null,
tickPixelInterval: 400,
tickWidth: 0,
gridLineWidth: 10,
gridLineColor: 'transparent',
labels: {
enabled: false
},
title: {
enabled: false
}
},
series: [{
// name: 'Speed',
data: [20],
dataLabels: {
format: '<div style="text-align:center">' +
'<span style="font-size:25px">{y}</span><br/>' +
'<span style="font-size:12px;opacity:0.4">km/h</span>' +
'</div>',
position: 'right',
},
tooltip: {
// valueSuffix: ' km/h'
enabled: false
}
}],
plotOptions: {
solidgauge: {
innerRadius: '85%',
dataLabels: {
y: -45,
borderWidth: 0,
useHTML: true
}
},
},
});
}
</ion-row><ion-row class="ion-align-self-start"><!-- <script src="https://code.highcharts.com/highcharts.js"></script>--><script src="https://code.highcharts.com/stock/highstock.js"></script><script src="https://code.highcharts.com/highcharts-more.js"></script><script src="https://code.highcharts.com/modules/solid-gauge.js"></script><script src="https://code.highcharts.com/modules/exporting.js"></script><script src="https://code.highcharts.com/modules/export-data.js"></script><script src="https://code.highcharts.com/modules/accessibility.js"></script><div id="particulate_plot" style="width:100%; height:100%;"></div><div id="MainGuageA" style="width: 100%;" class="posi"></div><!-- <ion-item class="leafpostion" lines="none"></ion-item>--><!-- <ion-icon name="leaf" class="leaf"></ion-icon>--></ion-row>
is possible in apache echarts to fill space from left and right?
When i'm use boundaryGap: false it looks like that (first and last value are partially hidden):
i need to fill left and right empty spaces and i have no idea how... Thanks
heres my code:
option = {
xAxis: {
type: 'category',
boundaryGap: false,
data: ['a', 'b','c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l'],
axisTick: {
show: false,
},
axisLine: {
show:false,
},
},
grid:{
height: 200,
left: 0,
right: 0,
},
yAxis: {
min: -10,
type: 'value',
silent: false,
axisLine:false,
axisLabel: false,
axisTick: false,
minorSplitLine: {
show: false
},
splitLine: {
show: true,
lineStyle: {
color: "#EAEEF6",
opacity: "1",
width: "1",
},
}
},
series: [
{
label: {
normal: {
show: true,
position: 'top',
color: '#474646',
fontSize:12,
fontWeight: 'bold'
}
},
data: [2,1,-4,-4,-3,-3,-5,-4,0,1,1.5,2],
type: 'line',
smooth: true,
}
],
}
https://jsfiddle.net/zm8whknr/
Option 1: You can modify the grid.left and grid.right options to set the left and right spacing of the chart to accommodate the cropped values,
grid:{
height: 200,
left: 10,
right: 10,
},
Result:
Option 2: You can align the first and last element's xaxis label and data label to 'left' and 'right' to avoid cropping.
Modified xAxis option,
xAxis.data = [{value:'a', textStyle:{'align': 'left'}}, ... ,{value:'l', textStyle:{'align': 'right'}}],
Modified Series data option,
series[0].data = [{value:2, label:{'align': 'left'}}, ... , {value:2, label:{'align': 'right'}}],
Chart Option,
option = {
xAxis: {
type: 'category',
boundaryGap: false,
data: [{value:'a', textStyle:{'align': 'left'}},'b','c','d','e','f','g','h','i','j','k',{value:'l', textStyle:{'align': 'right'}}],
axisTick: {
show: false,
},
axisLine: {
show:false,
},
},
grid:{
height: 200,
left: 0,
right: 0,
},
yAxis: {
min: -10,
type: 'value',
silent: false,
axisLine:false,
axisLabel: false,
axisTick: false,
minorSplitLine: {
show: false
},
splitLine: {
show: true,
lineStyle: {
color: "#EAEEF6",
opacity: "1",
width: "1",
},
}
},
series: [
{
label: {
normal: {
show: true,
position: 'top',
color: '#474646',
fontSize:12,
fontWeight: 'bold'
}
},
data: [{value:2, label:{'align': 'left'}},1,-4,-4,-3,-3,-5,-4,0,1,1.5, {value:2, label:{'align': 'right'}}],
type: 'line',
smooth: true,
animationDelay: idx => idx * 100,
lineStyle: {
normal: {
width: 4,
color:'#29d9c9',
shadowColor: 'rgba(41, 217, 201, 0.5)',
shadowOffsetX: 0,
shadowOffsetY: 8,
shadowBlur: 10
},
},
areaStyle: {
origin: 'start',
color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{
offset: 0,
color: 'rgba(0, 214, 143, 0.3)',
}, {
offset: 1,
color: 'rgba(0, 214, 143, 0)',
}]),
opacity: 1,
},
itemStyle:{
color: '#29d9c9',
borderWidth: 5
},
symbolSize: 5
}
],
animationEasing: 'elasticOut',
animationDelayUpdate: idx => idx * 5,
}
I am currently using Apex Line Chart to generate 6 series. The issue I am running into is that there are 3 pairs that share a y-axis title and ticks with its partner. If I display 2 series and they are partners their title and ticks display twice on the y axis. The only viable solution that I can think to implement is to have only one of each partner have a display on always, but ideally i want to hide the y axis when the partners aren't selected and display when they are selected. If anyone can help with the latter solution I would be very grateful
const options = {
chart: {
id: 'lineChart',
background: theme.palette.background.paper,
},
colors: [blue, yellow, green, red, pink, neonGreen],
height: '500px',
markers: {
size: 5,
},
series: [
{
name: 'Whopper fat',
data: whopperFatSeriesData,
},
{
name: 'Whopper Calories',
data: whopperCaloriesSeriesData,
},
{
name: 'Whopper Cost',
data: whopperCostSeriesData,
},
{
name: 'McDouble fat',
data: mcDoubleFatSeriesData,
},
{
name: 'McDouble Calories',
data: mcDoubleCaloriesSeriesData,
},
{
name: 'McDouble Cost',
data: mcDoubleCostSeriesData,
},
],
stroke: {
width: 2,
},
theme: {
mode: theme.palette.type,
},
tooltip: {
shared: true,
custom: function ({ dataPointIndex }: { dataPointIndex: number }) {
return renderToStaticMarkup(
<CustomTooltip data={whopperFatSeriesData} dataPointIndex={dataPointIndex}></CustomTooltip>,
)
},
},
title: {
text: 'Cloud Usage',
offsetY: -8,
style: {
fontSize: '24px',
},
},
xaxis: {
type: 'datetime',
title: {
text: '',
offsetY: 8,
style: {
fontSize: '15px',
},
},
labels: {
formatter: function (value: any, timestamp: any, index: any) {
return moment.utc(timestamp).format('DD-MMM-YY')
},
},
},
yaxis: [
{
max: getMaxCalories,
seriesName: 'Whopper Fat',
title: {
text: 'Whopper Fat (g)',
offsetX: -8,
style: {
fontSize: '15px',
},
},
decimalsInFloat: 3,
},
{
title: {
text: 'Whopper Calories (kc)',
opposite: -8,
style: {
fontSize: '15px',
color: yellow,
},
},
decimalsInFloat: 2,
opposite: true,
axisBorder: {
show: true,
color: yellow,
},
axisTicks: {
show: true,
},
showAlways: false,
},
{
title: {
text: 'Cost ($)',
offsetX: -8,
style: {
fontSize: '15px',
color: green,
},
},
decimalsInFloat: 2,
opposite: true,
axisBorder: {
show: true,
color: green,
},
axisTicks: {
show: true,
},
showAlways: false,
},
{
max: getMaxCalories,
title: {
text: 'McDouble fat (g)',
offsetX: -8,
style: {
fontSize: '15px',
},
show: false,
},
decimalsInFloat: 3,
show: false,
},
{
title: {
text: 'McDouble Calories (kc)',
opposite: -8,
style: {
fontSize: '15px',
color: yellow,
},
},
decimalsInFloat: 2,
opposite: true,
axisBorder: {
show: true,
color: yellow,
},
axisTicks: {
show: true,
},
showAlways: false,
},
{
title: {
text: 'Cost ($)',
offsetX: -8,
style: {
fontSize: '15px',
color: green,
},
},
decimalsInFloat: 2,
opposite: true,
axisBorder: {
show: true,
color: green,
},
axisTicks: {
show: true,
},
showAlways: false,
},
],
}
Image of Chart
I have created a Bar graph using echarts. I want to bind multiple values to data object dynamically, currently I'm able to bind only single value. here is my java script. I'mm a newbie for this, hoping for a fully functional solution.
var myChart = echarts.init(document.getElementById('page_views_today'));
var option = {
// Setup grid
grid: {
zlevel: 0,
x: 20,
x2: 40,
y: 20,
y2: 20,
borderWidth: 0,
backgroundColor: 'rgba(0,0,0,0)',
borderColor: 'rgba(0,0,0,0)',
},
// Add tooltip
tooltip: {
trigger: 'axis',
axisPointer: {
type: 'shadow', // line|shadow
lineStyle: { color: 'rgba(0,0,0,.5)', width: 1 },
shadowStyle: { color: 'rgba(0,0,0,.1)' }
}
},
// Add legend
legend: {
data: []
},
toolbox: {
orient: 'vertical',
show: true,
showTitle: true,
color: ['#bdbdbd', '#bdbdbd', '#bdbdbd', '#bdbdbd'],
feature: {
mark: { show: false },
dataZoom: {
show: true,
title: {
dataZoom: 'Data Zoom',
dataZoomReset: 'Reset Zoom'
}
},
dataView: { show: false, readOnly: true },
magicType: {
show: true,
itemSize: 12,
itemGap: 12,
title: {
line: 'Line',
bar: 'Bar',
},
type: ['line', 'bar'],
option: {
/*line: {
itemStyle: {
normal: {
color:'rgba(3,1,1,1.0)',
}
},
data: [1,2,3,4,5,6,7,8,9,10,11,12]
}*/
}
},
restore: { show: false },
saveAsImage: { show: true, title: 'Save as Image' }
}
},
// Enable drag recalculate
calculable: true,
// Horizontal axis
xAxis: [{
type: 'category',
boundaryGap: false,
data: [
'0h-2h', '2h-4h', '4h-6h', '6h-8h', '8h-10h', '10h-12h', '12h-14h', '14h-16h', '16h-18h', '18h-20h', '20h-22h', '22h-24h'
],
axisLine: {
show: true,
onZero: true,
lineStyle: {
color: 'rgba(63,81,181,1.0)',
type: 'solid',
width: '2',
shadowColor: 'rgba(0,0,0,0)',
shadowBlur: 5,
shadowOffsetX: 3,
shadowOffsetY: 3,
},
},
axisTick: {
show: false,
},
splitLine: {
show: false,
lineStyle: {
color: '#fff',
type: 'solid',
width: 0,
shadowColor: 'rgba(0,0,0,0)',
},
},
}],
// Vertical axis
yAxis: [{
type: 'value',
splitLine: {
show: false,
lineStyle: {
color: 'fff',
type: 'solid',
width: 0,
shadowColor: 'rgba(0,0,0,0)',
},
},
axisLabel: {
show: false,
},
axisTick: {
show: false,
},
axisLine: {
show: false,
onZero: true,
lineStyle: {
color: '#ff0000',
type: 'solid',
width: '0',
shadowColor: 'rgba(0,0,0,0)',
shadowBlur: 5,
shadowOffsetX: 3,
shadowOffsetY: 3,
},
},
}],
// Add series
series: [
{
name: 'Page Views',
type: 'bar',
smooth: true,
symbol: 'none',
symbolSize: 2,
showAllSymbol: true,
barWidth: 10,
itemStyle: {
normal: {
color: 'rgba(63,81,181,1.0)',
borderWidth: 2, borderColor: 'rgba(63,81,181,1)',
areaStyle: { color: 'rgba(63,81,181,1)', type: 'default' }
}
},
data: []
}
]
};
Here is my java-script function from where I want to bind the values dynamically.
// Load data into the ECharts instance
load_graph_with_positions(option);
function load_graph_with_positions(option) {
option.series[0].data[0] = 1234;
myChart.setOption(option);
}
One way to do this is by passing values in an array and then shifting the previous values, while pushing-in the data. Following is the example of shiting and pushing the data:
option.series[0].data.shift();
option.series[0].data.push(json.num);
Hence your function will become:
function load_graph_with_positions(option,values) {
var valuesLength = values.length;
for (var i = 0; i < valuesLength; i++) {
option.series[0].data.shift();
option.series[0].data.push(values[i]);
}
myChart.setOption(option);
}
You can also refer to following github example for dynamic addition:
https://github.com/hisune/Echarts-PHP/blob/master/demo/dynamic.php