Javascript 如何在海图中获得y轴的极限值?
在Highcharts中,我可以使用xAxis事件获取当前视图的极值(x轴边界),但如何获取这些边界处每个系列的Y轴值Javascript 如何在海图中获得y轴的极限值?,javascript,highcharts,Javascript,Highcharts,在Highcharts中,我可以使用xAxis事件获取当前视图的极值(x轴边界),但如何获取这些边界处每个系列的Y轴值 xAxis: { events: { setExtremes: function (e) { $('#report').html( '<b>The new time interval is: (' + Highcharts.dateFormat("%m/%d
xAxis: {
events: {
setExtremes: function (e) {
$('#report').html(
'<b>The new time interval is: (' +
Highcharts.dateFormat("%m/%d/%Y", e.min) +
', ' +
Highcharts.dateFormat("%m/%d/%Y", e.max) +
').</b><br />The values at those boundaries are: <b>(Y1, Y2)</b>.'
);
}
}
},
更新:根据评论:
var data = e.target.series[0].processedYData; // Get the y-axis data.
var dataMin = data[0]; // The first value.
var dataMax = data[data.length-1]; // The last value.
$(函数(){
$(“#容器”).highcharts('StockChart'{
xAxis:{
活动:{
设置极端值:函数(e){
//警报('新的时间间隔为:min:'+
//dateFormat(“%m/%d/%Y”,e.max));
var data=e.target.series[0]。processedYData;
var dataMin=数据[0];
var dataMax=data[data.length-1];
$(“#报告”).html(
'新的时间间隔为:('+
Highcharts.dateFormat(“%m/%d/%Y”,e.min)+
', ' +
Highcharts.dateFormat(“%m/%d/%Y”,e.max)+
“)。
这些边界处的值为:(“+dataMin+”、“+dataMax+”);
}
}
},
范围选择器:{
选定:1
},
系列:[{
名称:“MSFT”,
资料来源:MSFT
}]
});
});代码>
我在上一次单击中看到了Y值,因为我使用了setextrems事件来形成我的HTML。还有另一个名为“Extremes后的事件”的事件专门用于此目的
更新的JavaScript代码:
$(function () {
function create_new_legend(e) {
var html = `
<table id="new-legend">
<tr>
<th> </th>
<th class="price">Start</th>
<th class="price">End</th>
<th class="price">Change</th>
</tr>
`;
for (var i = 0; i < e.target.series.length; ++i) {
var series_name = e.target.series[i].name;
// Skip over the navigator.
if (series_name.toLowerCase().trim() ==
"Navigator".toLowerCase().trim())
{
continue;
}
var series_min_date = e.target.series[i].processedXData[0];
var series_max_date = e.target.series[i].processedXData[
e.target.series[i].processedXData.length - 1];
var series_processed_y_data = e.target.series[i].processedYData;
var series_min_y_data = series_processed_y_data[0].toFixed(2);
var series_max_y_data = series_processed_y_data[
series_processed_y_data.length - 1].toFixed(2);
var series_data_change = ((series_max_y_data - series_min_y_data)/(series_min_y_data) * 100).toFixed(2);
var series_css_class = (series_data_change > 0)
? 'pos' : ((series_data_change == 0)
? 'zero' : 'neg');
html += `
<tr>
<td class="stock">` + series_name + `</td>
<td class="price">` + series_min_y_data + `</td>
<td class="price">` + series_max_y_data + `</td>
<td class="price"><span class="` + series_css_class + '">' + series_data_change + `%</td>
</tr>
`;
} // end iterate through each series
html += `
</table>
`;
$('#div-new-legend').html(html);
} // end function create_new_legend(e)
$('#container').highcharts('StockChart', {
chart: {
renderTo: 'container',
events: {
load: create_new_legend
}
},
legend: {
enabled: true,
align: 'right',
verticalAlign: 'middle',
layout: 'vertical',
width: 200,
borderColor: 'black',
borderWidth: 0.5
},
xAxis: {
events: {
afterSetExtremes: create_new_legend
}
},
rangeSelector: {
selected: 1
},
series: [{
name: 'Microsoft',
data: MSFT
}, {
name: 'Adobe',
data: ADBE
}, {
name: 'Google',
data: GOOGL
}]
});
});
不幸的是,这似乎并不正确。例如,如果我调整其大小,使x轴最小数据点为2015年5月7日,则dataMin点读数为46.14,但该日期的实际MSFT股价数据点为47.75。它们不应该是相同的吗?不一定是鼠标悬停时读取的MSFT值。你必须看到可见范围的最小值和最大值。我认为这不是他想要的。yAxis.getextrems将为您提供数据集中的最大和最小y值,而OP希望找出与xAxis.getextrems.Rahul Sharma对应的y值是正确的。这正是我想要的。@snrub先生,这也不是真的。我试过了,但并不总是这样。问题是,我认为,processedYData似乎具有绘制在图形上的点,但在某些情况下,极值无法悬停,因为它们太接近边缘。为了测试它们并不总是关闭一个元素,更改范围的左边界,保持右边界不变。您有JSFIDLE版本吗?我自己做的。也许有人可以使用它:)
.pos {
color: green;
}
.neg {
color: red;
}
#new-legend-header {
background-color: #e7f0f9;
font-weight: bold;
font-size: 100%;
text-align: center;
padding: 0.5em;
width: 300px;
margin-bottom: 0;
}
#new-legend {
margin-top: 0.5em;
background-color: #FFFFFF;
border-collapse: collapse;
width: 300px;
font-family: "Lucida Grande","Lucida Sans Unicode",Arial,Helvetica,sans-serif;
font-size: 12px;
line-height: normal;
}
#new-legend th,
#new-legend td {
padding: 0;
}
#new-legend td.stock {
text-align: left;
padding-left: 0.5em;
}
#new-legend td {
text-align: right;
}
var data = e.target.series[0].processedYData; // Get the y-axis data.
var dataMin = data[0]; // The first value.
var dataMax = data[data.length-1]; // The last value.
$(function () {
function create_new_legend(e) {
var html = `
<table id="new-legend">
<tr>
<th> </th>
<th class="price">Start</th>
<th class="price">End</th>
<th class="price">Change</th>
</tr>
`;
for (var i = 0; i < e.target.series.length; ++i) {
var series_name = e.target.series[i].name;
// Skip over the navigator.
if (series_name.toLowerCase().trim() ==
"Navigator".toLowerCase().trim())
{
continue;
}
var series_min_date = e.target.series[i].processedXData[0];
var series_max_date = e.target.series[i].processedXData[
e.target.series[i].processedXData.length - 1];
var series_processed_y_data = e.target.series[i].processedYData;
var series_min_y_data = series_processed_y_data[0].toFixed(2);
var series_max_y_data = series_processed_y_data[
series_processed_y_data.length - 1].toFixed(2);
var series_data_change = ((series_max_y_data - series_min_y_data)/(series_min_y_data) * 100).toFixed(2);
var series_css_class = (series_data_change > 0)
? 'pos' : ((series_data_change == 0)
? 'zero' : 'neg');
html += `
<tr>
<td class="stock">` + series_name + `</td>
<td class="price">` + series_min_y_data + `</td>
<td class="price">` + series_max_y_data + `</td>
<td class="price"><span class="` + series_css_class + '">' + series_data_change + `%</td>
</tr>
`;
} // end iterate through each series
html += `
</table>
`;
$('#div-new-legend').html(html);
} // end function create_new_legend(e)
$('#container').highcharts('StockChart', {
chart: {
renderTo: 'container',
events: {
load: create_new_legend
}
},
legend: {
enabled: true,
align: 'right',
verticalAlign: 'middle',
layout: 'vertical',
width: 200,
borderColor: 'black',
borderWidth: 0.5
},
xAxis: {
events: {
afterSetExtremes: create_new_legend
}
},
rangeSelector: {
selected: 1
},
series: [{
name: 'Microsoft',
data: MSFT
}, {
name: 'Adobe',
data: ADBE
}, {
name: 'Google',
data: GOOGL
}]
});
});
.pos {
color: green;
}
.neg {
color: red;
}
.zero {
color: black;
}
#new-legend {
margin-top: 0.5em;
background-color: #FFFFFF;
border-collapse: collapse;
width: 300px;
font-family: "Lucida Grande","Lucida Sans Unicode",Arial,Helvetica,sans-serif;
font-size: 12px;
line-height: normal;
}
#new-legend th,
#new-legend td {
padding: 0;
}
#new-legend td.stock {
text-align: left;
padding-left: 0.5em;
}
.price {
text-align: right;
}