我正在使用Extjs 4和MVC架构。
我有一个输出这个Json数据的python脚本:
{
"data": [
{
"inAnalysis": 3,
"inQuest": 2,
"inDevelopment": 6,
"total": 12,
"inValidation": 1,
"Month": 1303
},
{
"inAnalysis": 1,
"total": 5,
"Month": 1304,
"inDevelopment": 4
}
],
"success": true,
"metaData": {
"fields": [
{
"name": "inAnalysis"
},
{
"name": "inQuest"
},
{
"name": "inDevelopment"
},
{
"name": "inValidation"
},
{
"name": "isDuplicate"
},
{
"name": "New"
},
{
"name": "total"
}
],
"root": "data"
}
}
我想将MetaData的字段用作图表系列,所以我有这样的商店:
Ext.define('Proj.store.ChartData', {
extend: 'Ext.data.Store',
autoload: true,
proxy: {
type: 'ajax',
url : 'data/getParams.py',
reader: new Ext.data.JsonReader({
fields:[]
}),
root: 'data'
}
为了在图表中添加系列,我做了这个:
var chart = Ext.widget('drawchart');
var fields = [];
chartStore.each(function (field) {
fields.push(Ext.create('Ext.data.Field', {
name: field.get('name')
}));
});
chartModel.prototype.fields.removeAll();
chartModel.prototype.fields.addAll(fields);
var series = [];
for (var i = 1; i < fields.length; i++) {
var newSeries = new Ext.chart.BarSeries({
type: 'column',
displayName: fields[i].name,
xField: ['Month'],
yField: fields[i].name,
style: {
mode: 'stretch',
color: this.chartColors[i + 1]
}
});
series.push(newSeries);
chart.series = series;
};
chart.bindStore(chartStore);
chart.redraw();
chart.refresh();
但它没有用,我认为fields数组总是空的... 任何帮助将不胜感激:
答案 0 :(得分:7)
交换或重新加载商店很容易,但是您很难重新配置轴和系列后续... Ext图表不支持。可以替换myChart.axes
集合中的轴,对于系列也是如此,然后仔细研究代码,替换删除现有的精灵等等。然而,这是一个傻瓜&#39;因为,一旦你的代码对Ext的图表代码(将要发生)的未来演变非常脆弱,其次是一个更容易和可靠的解决方案。那就是创建一个新图表,删除旧图表,将新图表放在原位,然后坐下!用户不会看到差异。
您没有提供有关代码的大量信息,因此我将使用Bar chart example解决方案。
首先,您需要修理您的商店:
Ext.define('Proj.store.ChartData', {
extend: 'Ext.data.Store',
//autoload: true,
autoLoad: true, // there was a type in there
fields: [], // was missing
proxy: {
type: 'ajax',
url : 'data/getParams.py',
// better to inline the proxy (lazy init)
reader: {
type: 'json'
,root: 'data' // and root is an option of the reader, not the proxy
}
// reader: new Ext.data.JsonReader({
// fields:[]
// }),
// root: 'data'
}
});
然后,让我们稍微丰富您的回答,以便将之前客户端的模型知识最小化为无。我已将totalField
和categoryField
添加到metaData
节点,我们将其用于轴和系列:
{
"data": [
{
"inAnalysis": 3,
"inQuest": 2,
"inDevelopment": 6,
"total": 12,
"inValidation": 1,
"Month": 1303
},
{
"inAnalysis": 1,
"total": 5,
"Month": 1304,
"inDevelopment": 4
}
],
"success": true,
"metaData": {
"totalField": "total",
"categoryField": "Month",
"fields": [
{
"name": "Month"
},
{
"name": "inAnalysis"
},
{
"name": "inQuest"
},
{
"name": "inDevelopment"
},
{
"name": "inValidation"
},
{
"name": "isDuplicate"
},
{
"name": "New"
},
{
"name": "total"
}
],
"root": "data"
}
}
请注意,代理会自动捕获响应中的metaData
并相应地重新配置其商店(隐式)模型...所以您不需要您的gloubiboulga来执行此操作你自己。值得注意的是,读者将在其rawData
属性中保留原始响应数据的副本;这对于获取我们已添加的自定义信息非常有用。
现在我们有一个适当的商店,会收到详细的回复,让我们使用它:
new Proj.store.ChartData({
listeners: {
load: replaceChart
}
});
这将触发replaceChart
方法,该方法将根据服务器提供的元数据和数据创建一个全新的图表,并销毁并替换旧的图表。这是功能:
function replaceChart(chartStore) {
// Grab the name of the total & category fields as instructed by the server
var meta = chartStore.getProxy().getReader().rawData.metaData,
totalField = meta.totalField,
categoryField = meta.categoryField;
// Build a list of all field names, excluding the total & category ones
var fields = Ext.Array.filter(
Ext.pluck(chartStore.model.getFields(), 'name'),
function(field) {
return field !== categoryField && field !== totalField;
}
);
// Create a pimping new chat like you like
var chart = Ext.create('Ext.chart.Chart', {
store: chartStore,
legend: true,
axes: [{
type: 'Numeric',
position: 'bottom',
fields: [totalField]
}, {
type: 'Category',
position: 'left',
fields: [categoryField]
}],
series: [{
type: 'bar',
axis: 'bottom',
label: {
display: 'insideEnd',
field: fields
},
xField: categoryField,
yField: fields,
stacked: true // or not... like you want!
}]
});
// Put it in the exact same place as the old one, that will trigger
// a refresh of the layout and a render of the chart
var oldChart = win.down('chart'),
oldIndex = win.items.indexOf(oldChart);
win.remove(oldChart);
win.insert(oldIndex, chart);
// Mission complete.
}
答案 1 :(得分:0)
尝试清除未使用系列的行缓存:
Ext.Array.each(chart.series.items, function(item){
if(!item.items.length){
item.line = null;
}
});