[英]I can't get json data in code javascript for google chart (project Python Hello Dashboard sample)
Python Hello Dashboard示例我无法运行此项目。 该项目在文件index.html中存在一些问题:我无法获取DataTable的变量数据类型为JSON(dict)。
geodata = {{ data }} // error
geodata="{{data}}" //it is String not type JSON
累积引起错误行google.visualization.DataTable(geodata)请帮帮我!
<script type='text/javascript'>
google.load('visualization', '1', {'packages':
['geochart']});
google.setOnLoadCallback(drawMarkersMap);
geodata = {{ data }} // error
function drawMarkersMap() {
if (! geodata) return;
var data = new google.visualization.DataTable(geodata);
var options = {
region: 'US',
displayMode: 'region',
resolution: 'provinces',
width: '800'
};
var chart = new google.visualization.GeoChart(
document.getElementById('chart_div'));
chart.draw(data, options);
};
</script>
它在此链接中: https : //developers.google.com/bigquery/articles/dashboard#downloadinstalllibraries
您需要更全面地阅读本教程。
{{ data }}
是一个模板占位符 ,它本身不是JSON(并且远没有有效)。 在本教程的进一步内容中,呈现模板时将填充占位符:
@decorator.oauth_required
def get(self):
data = { 'data': self._bq2geo(bq.Query(QUERY, BILLING_PROJECT_ID)),
'query': QUERY }
template = os.path.join(os.path.dirname(__file__), 'index.html')
self.response.out.write(render(template, data))
data
字典中的data
键提供要填充的值; self._bq2geo()
方法生成JSON值:
def _bq2geo(self, bqdata):
"""geodata output for region maps must be in the format region, value.
Assume the BigQuery query output is in this format and get names from schema.
"""
logging.info(bqdata)
columnNameGeo = bqdata['schema']['fields'][0]['name']
columnNameVal = bqdata['schema']['fields'][1]['name']
logging.info("Column Names=%s, %s" % (columnNameGeo, columnNameVal))
geodata = { 'cols': ({'id':columnNameGeo,'label':columnNameGeo,'type':'string'},
{'id':columnNameVal, 'label':columnNameVal, 'type':'number'})}
geodata['rows'] = [];
logging.info(geodata)
for row in bqdata['rows']:
newrow = ({'c':[]})
newrow['c'].append({'v': 'US-'+row['f'][0]['v']})
newrow['c'].append({'v':row['f'][1]['v']})
geodata['rows'].append(newrow)
logging.info('FINAL GEODATA---')
logging.info(geodata)
return json.dumps(geodata)
该方法返回一个JSON值,该值将替换{{ data }}
占位符字符串。
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