前端之家

  1. 首页
  2. 问答

为Google数字范围过滤器的较低范围设置最大值

• 问答

我有一个交互式的Google折线图，可以显示用户选择的两年不同年份的历史海平面数据。该图表还显示所选期间的线性趋势线和多项式趋势线。可用的历史数据范围介于1904年至2018年之间。但是，用户可以选择1904年到2120年之间的任何开始年和结束年。如果选择了2018年之后的结束年份，则图表将显示直到2018年的可用历史数据，然后将两条趋势线延伸以显示用户选择的年份之前的预测海平面。

这似乎行之有效，直到选择的两个年份都超过了2018年，即抛出错误时“ 2020年和2056年”（“无法读取null的属性'top'”），因为它无法从包含以下时间段的期间计算和绘制趋势线没有观察到的数据。目前，我正在使用一个错误处理程序来解决此问题，该错误处理程序将在发生这种情况时启动，并显示一条警告消息，提示用户他们不能选择大于2018年的开始年份。然后重新加载页面，并且数字范围过滤器默认返回分别到1904年和2018年的开始和结束年度，这并不理想。我想做的是限制用户选择不超过2018年的开始年份，但是似乎没有在数字范围过滤器控件中进行此操作的选项/设置。有什么想法吗？

我的代码：

<html>

<script src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">

google.charts.load('current',{
  packages: ['controls']
}).then(initialize);

function initialize() {
  var query = new google.visualization.Query('https://docs.google.com/spreadsheets/d/1vn1iuhsG33XzFrC4QwkTdUnxOGdcPQOj-cuaEZeX-eA/edit#gid=0');
  query.send(drawDashboard);
}

function drawDashboard(response) {

  var data = response.getDataTable();
  //Asign units of 'mm' to data.
  var formatMS = new google.visualization.NumberFormat({
    pattern: '# mm'
  });

  // format data into mm.
  for (var colIndex = 1; colIndex < data.getNumberOfColumns(); colIndex++) {
    formatMS.format(data,colIndex);
  }
  var YearPicker = new google.visualization.ControlWrapper({
    controlType: 'NumberRangeFilter',containerId: 'filter_div',options: {
      maxValue:2120,filterColumnLabel: 'Year',ui: {
        cssClass: 'filter-date',format: {pattern: '0000'},labelStacking: 'vertical',allowTyping: false,allowMultiple: false
      }
    },"state": {"lowValue": 1904,"highValue": 2018},});

  google.visualization.events.addListener(YearPicker,'statechange',filterChange);

  var MSLChart = new google.visualization.ChartWrapper({
    chartType: 'LineChart',containerId: 'chart_div',dataTable: data,options: {
      fontSize: '14',title: 'Timbucktoo Annual Mean Sea Level Summary',hAxis: {title: 'Year',format: '0000'},vAxis: {title: 'Height above Chart Datum (mm)',format:'###0'},height: 600,chartArea: {height: '81%',width: '85%',left: 100},legend: {position: 'in',alignment: 'end',textStyle: {fontSize: 13}},colors: ['blue'],trendlines: {
        0: {
          type: 'polynomial',degree: 2,color: 'green',visibleInLegend: true,},1: {
          type: 'linear',color: 'black',series: {
        0: { visibleInLegend: true },1: { visibleInLegend: false },view: {columns: [0,1,2]}
  });

  google.visualization.events.addOneTimeListener(MSLChart,'ready',filterChange);

  function filterChange() {
    // get chart layout
    var chartLayout = MSLChart.getchart().getchartLayoutInterface();

    // get y-axis bounds
    var yAxisCoords = {min: null,max: null};
    var lineIndex = 0;
    var boundsLine = chartLayout.getBoundingBox('line#' + lineIndex);
   try {
    do {
      yAxisCoords.max = yAxisCoords.max || boundsLine.top;
      yAxisCoords.max = Math.min(yAxisCoords.max,boundsLine.top);
      yAxisCoords.min = yAxisCoords.min || (boundsLine.top + boundsLine.height);
      yAxisCoords.min = Math.max(yAxisCoords.min,(boundsLine.top + boundsLine.height));
      lineIndex++;
      boundsLine = chartLayout.getBoundingBox('line#' + lineIndex);
    } while (boundsLine !== null);
     }
     catch (error) {alert("Please choose a start year less than or equal to 2018");
     window.location.reload(false);
     exit;
     }
    var state = YearPicker.getState();
      var EndYear = state.highValue;
    // re-draw chart
    MSLChart.setOption('vAxis.viewWindow.max',chartLayout.getVAxisValue(yAxisCoords.max));
    MSLChart.setOption('vAxis.viewWindow.min',chartLayout.getVAxisValue(yAxisCoords.min));
    MSLChart.setOption('hAxis.viewWindow.max',EndYear);
    MSLChart.draw();
    google.visualization.events.addOneTimeListener(MSLChart.getchart(),filterChange);
    }

  var dashboard = new google.visualization.Dashboard(
    document.getElementById('dashboard_div')
  ).bind(YearPicker,MSLChart).draw(data);
}
</script>
  <div id="dashboard_div">
    <div id="chart_div"></div>
    <div id="filter_div"></div>
  </div>
</html>
king1302218 回答：为Google数字范围过滤器的较低范围设置最大值

为防止错误，请在HSSFCellStyle cellStyleAllF = null; cellStyleAllF = wb.createCellStyle(); cellStyleAllF.setAlignment(HSSFCellStyle.ALIGN_CENTER); cellStyleAllF.setVerticalAlignment(HSSFCellStyle.ALIGN_LEFT); cellStyleAllF.setBorderTop(HSSFCellStyle.BORDER_THIN); cellStyleAllF.setTopBorderColor(HSSFColor.BLACK.index); cellStyleAllF.setBorderRight(HSSFCellStyle.BORDER_THIN); cellStyleAllF.setRightBorderColor(HSSFColor.BLACK.index); cellStyleAllF.setBorderBottom(HSSFCellStyle.BORDER_THIN); cellStyleAllF.setBottomBorderColor(HSSFColor.BLACK.index); cellStyleAllF.setBorderLeft(HSSFCellStyle.BORDER_THIN); cellStyleAllF.setLeftBorderColor(HSSFColor.BLACK.index); 函数中，
更改filterChange语句

do...while

只是一个do { yAxisCoords.max = yAxisCoords.max || boundsLine.top; yAxisCoords.max = Math.min(yAxisCoords.max,boundsLine.top); yAxisCoords.min = yAxisCoords.min || (boundsLine.top + boundsLine.height); yAxisCoords.min = Math.max(yAxisCoords.min,(boundsLine.top + boundsLine.height)); lineIndex++; boundsLine = chartLayout.getBoundingBox('line#' + lineIndex); } while (boundsLine !== null); 语句

while

while (boundsLine !== null) { yAxisCoords.max = yAxisCoords.max || boundsLine.top; yAxisCoords.max = Math.min(yAxisCoords.max,(boundsLine.top + boundsLine.height)); lineIndex++; boundsLine = chartLayout.getBoundingBox('line#' + lineIndex); }; 假定将始终绘制至少一条线。

我们不能阻止用户选择超过2018年的开始年份，
但是我们可以立即重置开始年份。 

do...while

请参阅以下工作片段... 

google.visualization.events.addListener(YearPicker,'statechange',function () {
  var state = YearPicker.getState();
  state.lowValue = Math.min(2018,state.lowValue);
  YearPicker.setState({
    lowValue: state.lowValue,highValue: state.highValue
  });
  YearPicker.draw();
  filterChange();
});

google.charts.load('current',{
  packages: ['controls']
}).then(initialize);

function initialize() {
  var query = new google.visualization.Query('https://docs.google.com/spreadsheets/d/1vn1iuhsG33XzFrC4QwkTdUnxOGdcPQOj-cuaEZeX-eA/edit#gid=0');
  query.send(drawDashboard);
}

function drawDashboard(response) {

  var data = response.getDataTable();
  //Asign units of 'mm' to data.
  var formatMS = new google.visualization.NumberFormat({
    pattern: '# mm'
  });

  // format data into mm.
  for (var colIndex = 1; colIndex < data.getNumberOfColumns(); colIndex++) {
    formatMS.format(data,colIndex);
  }
  var YearPicker = new google.visualization.ControlWrapper({
    controlType: 'NumberRangeFilter',containerId: 'filter_div',options: {
      maxValue: 2120,filterColumnLabel: 'Year',ui: {
        cssClass: 'filter-date',format: {pattern: '0000'},labelStacking: 'vertical',allowTyping: false,allowMultiple: false
      }
    },state: {lowValue: 1904,highValue: 2018},});

  google.visualization.events.addListener(YearPicker,function () {
    var state = YearPicker.getState();
    state.lowValue = Math.min(2018,state.lowValue);
    YearPicker.setState({
      lowValue: state.lowValue,highValue: state.highValue
    });
    YearPicker.draw();
    filterChange();
  });

  var MSLChart = new google.visualization.ChartWrapper({
    chartType: 'LineChart',containerId: 'chart_div',dataTable: data,options: {
      fontSize: '14',title: 'Timbucktoo Annual Mean Sea Level Summary',hAxis: {title: 'Year',format: '0000'},vAxis: {title: 'Height above Chart Datum (mm)',format:'###0'},height: 600,chartArea: {height: '81%',width: '85%',left: 100},legend: {position: 'in',alignment: 'end',textStyle: {fontSize: 13}},colors: ['blue'],trendlines: {
        0: {
          type: 'polynomial',degree: 2,color: 'green',visibleInLegend: true,},1: {
          type: 'linear',color: 'black',series: {
        0: { visibleInLegend: true },1: { visibleInLegend: false },view: {columns: [0,1,2]}
  });

  google.visualization.events.addOneTimeListener(MSLChart,'ready',filterChange);

  function filterChange() {
    // get chart layout
    var chartLayout = MSLChart.getChart().getChartLayoutInterface();

    // get y-axis bounds
    var yAxisCoords = {min: null,max: null};
    var lineIndex = 0;
    var boundsLine = chartLayout.getBoundingBox('line#' + lineIndex);

    while (boundsLine !== null) {
      yAxisCoords.max = yAxisCoords.max || boundsLine.top;
      yAxisCoords.max = Math.min(yAxisCoords.max,boundsLine.top);
      yAxisCoords.min = yAxisCoords.min || (boundsLine.top + boundsLine.height);
      yAxisCoords.min = Math.max(yAxisCoords.min,(boundsLine.top + boundsLine.height));
      lineIndex++;
      boundsLine = chartLayout.getBoundingBox('line#' + lineIndex);
    };

    var state = YearPicker.getState();
    var EndYear = state.highValue;

    // re-draw chart
    MSLChart.setOption('vAxis.viewWindow.max',chartLayout.getVAxisValue(yAxisCoords.max));
    MSLChart.setOption('vAxis.viewWindow.min',chartLayout.getVAxisValue(yAxisCoords.min));
    MSLChart.setOption('hAxis.viewWindow.max',EndYear);
    MSLChart.draw();
    google.visualization.events.addOneTimeListener(MSLChart.getChart(),filterChange);
  }

  var dashboard = new google.visualization.Dashboard(
    document.getElementById('dashboard_div')
  ).bind(YearPicker,MSLChart).draw(data);
}

编辑

没有用于修改趋势线工具提示的选项，
但是我们可以在<script src="https://www.gstatic.com/charts/loader.js"></script> <div id="dashboard_div"> <div id="chart_div"></div> <div id="filter_div"></div> </div>事件期间手动更改它。

首先，我们需要使用html工具提示，默认情况下它们是svg。
添加此选项... 

'onmouseover'

然后将 tooltip: { isHtml: true },事件添加到图表中，
我们可以在包装器的'onmouseover'事件中执行此操作。 

'ready'

请参阅以下工作片段... 

google.visualization.events.addOneTimeListener(MSLChart,function () {
  google.visualization.events.addListener(MSLChart.getChart(),'onmouseover',function (props) {
    // ensure trendline tooltip
    if ((props.column === 0) && (props.row !== null)) {
      // get year value
      var year = MSLChart.getDataTable().getValue(props.row,0);

      // get tooltip,remove width
      var tooltip = MSLChart.getChart().getContainer().getElementsByTagName('ul');
      tooltip[0].parentNode.style.width = null;

      // get tooltip labels
      var tooltipLabels = MSLChart.getChart().getContainer().getElementsByTagName('span');

      // set year
      tooltipLabels[0].innerHTML = year;

      // remove formula
      tooltipLabels[1].innerHTML = '';

      // set height value
      var height = parseFloat(tooltipLabels[2].innerHTML.split(' ')[2].replace(',','')).toFixed(0);
      tooltipLabels[2].innerHTML = height + ' mm';
    }
  });
});

google.charts.load('current',tooltip: {
        isHtml: true
      },filterChange);
  }

  google.visualization.events.addOneTimeListener(MSLChart,function () {
    google.visualization.events.addListener(MSLChart.getChart(),function (props) {
      // ensure trendline tooltip
      if ((props.column === 0) && (props.row !== null)) {
        var year = MSLChart.getDataTable().getValue(props.row,0);

        // get tooltip,remove width
        var tooltip = MSLChart.getChart().getContainer().getElementsByTagName('ul');
        tooltip[0].parentNode.style.width = null;

        // get tooltip labels
        var tooltipLabels = MSLChart.getChart().getContainer().getElementsByTagName('span');

        // set year
        tooltipLabels[0].innerHTML = year;

        // remove formula
        tooltipLabels[1].innerHTML = '';

        // set height
        var height = parseFloat(tooltipLabels[2].innerHTML.split(' ')[2].replace(','')).toFixed(0);
        tooltipLabels[2].innerHTML = height + ' mm';
      }
    });
  });

  var dashboard = new google.visualization.Dashboard(
    document.getElementById('dashboard_div')
  ).bind(YearPicker,MSLChart).draw(data);
}

controlsgoogle-chartwrappergoogle-visualizationjavascripttrendline
本文链接：https://www.f2er.com/3105577.html

大家都在问