小编Gra*_*ill的帖子

我试图在用户点击特定栏时触发使用Google的Chart API创建新的BarChart.我想我理解这些概念,并希望至少让getSelection()函数工作并显示用户点击的栏.但每次,当你点击栏时,它只是冻结了显示屏而没有java警报.有什么想法吗？

这是代码:

<script type="text/javascript">
            google.setOnLoadCallback(drawChart);

            function drawChart() {
                var visualization = new google.visualization.BarChart(document.getElementById('acctmeta'));
                var json_data = new google.visualization.DataTable({{acctmeta_json}});          

                visualization.draw(json_data, {width: 850, height: 600, title: 'Collection Level Populated Metadata Fields',
                                  chartArea: {width:"50%"},
                                  vAxis: {title: 'Collection Title/ID', titleTextStyle: {color: 'green'}},
                                  hAxis: {logScale:false, title:'Fields Populated', titleTextStyle: {color: 'green'}}
                                 });

                // Add our selection handler.
                google.visualization.events.addListener(visualization, 'select', selectHandler);


                // The selection handler.
                // Loop through all items in the selection and concatenate
                // a single message from all of them.
                function selectHandler() { …