EDITED I am using Sencha touch charts sample provided for column charts. The code is as below
new Ext.chart.Panel({
fullscreen: true,
title: 'Column Chart',
dockedItems: [{
xtype: 'button',
iconCls: 'help',
iconMask: true,
ui: 'plain',
handler: onHelpTap
}, {
xtype: 'button',
iconCls: 'shuffle',
iconMask: true,
ui: 'plain',
handler: onRefreshTap
}],
items: {
cls: 'column1',
animate: {
easing: 'bounceOut',
duration: 750
},
store: window.store1,
shadow: false,
gradients: [{
'id': 'v-1',
'angle': 0,
stops: {
0: {
color: 'rgb(212, 40, 40)'
},
100: {
color: 'rgb(117, 14, 14)'
}
}
},
{
'id': 'v-2',
'angle': 0,
stops: {
0: {
color: 'rgb(180, 216, 42)'
},
100: {
color: 'rgb(94, 114, 13)'
}
}
},
{
'id': 'v-3',
'angle': 0,
stops: {
0: {
color: 'rgb(43, 221, 115)'
},
100: {
color: 'rgb(14, 117, 56)'
}
}
},
{
'id': 'v-4',
'angle': 0,
stops: {
0: {
color: 'rgb(45, 117, 226)'
},
100: {
color: 'rgb(14, 56, 117)'
}
}
},
{
'id': 'v-5',
'angle': 0,
stops: {
0: {
color: 'rgb(187, 45, 222)'
},
100: {
color: 'rgb(85, 10, 103)'
}
}
}],
axes: [{
type: 'Numeric',
position: 'left',
fields: ['wins'],
minimum: 0,
maximum: 10,
label: {
renderer: function (v) {
return v.toFixed(0);
}
},
title: 'Wins'
},
{
type: 'Category',
position: 'bottom',
fields: ['School'],
title: 'School'
}],
series: [{
type: 'column',
axis: 'left',
highlight: true,
renderer: function (sprite, storeItem, barAttr, i, store) {
barAttr.fill = colors[i % colors.length];
return barAttr;
},
label: {
field: 'wins'
},
xField: 'School',
yField: 'wins'
}],
interactions: [{
type: 'panzoom',
axes: ['bottom']
}]
}
});
}
EDITED: I am now able to load the json data when I check this in the debugger but my chart is still not getting displayed. Here is my updated code
Ext.regModel('Details', { fields: [{ name: 'School' }, { name: 'wins'}] });
// create the Data Store
window.store1 = new Ext.data.Store({
model: 'Details',
proxy: {
type: 'scripttag',
url: 'http://localhost:2650/AjaxWCFService.svc/GetDataset',
reader: {
root: 'data',
type: 'json'
}
},
autoLoad: true
});
appreciate if anyone could let me know if I am doing anything wrong.
OLD POST: I am using a json output to bind to my Sencha Column chart. My code is as belows -
Ext.regModel('details', { idProperty: 'name', fields: ['School', 'wins'] });
// create the Data Store
window.store1 = new Ext.data.Store({
model: 'details',
autoLoad: true,
proxy: {
type: 'ajax',
method: 'POST',
url: 'http://localhost:2650/AjaxWCFService.svc/GetDataset',
reader: {
type: 'json',
root: 'data'
}
},
listeners: {
load: function (obj, records) {
Ext.each(records, function (rec) {
console.log(rec.get('name'));
});
}
}
});
This is the json data that is returned from the url
{
data: [
{School:'Dukes',wins:'3'},
{School:'Emmaus',wins:'10'},
{School:'Maryland',wins:'5'},
{School:'Virginia',wins:'2'}
]
}
But this doesn't display the graph instead I get a javascript error "Uncaught type error: Cannot read property lenght of undefined" in sencha-touch.js file.
If i hard code the data from the json output directly then it works
window.store1 = new Ext.data.JsonStore({
root: 'data',
fields: ['School', 'wins'],
autoLoad: true,
data: [
{School:'Dukes',wins:'3'},
{School:'Emmaus',wins:'10'},
{School:'Maryland',wins:'5'},
{School:'Virginia',wins:'2'}
]
});
Also when I load the jsonStore from the ExtDesigner it works fine. When I copy the same code in my Secha charts index.js file it doesn't work.
Can someone please let me know what I am doing wrong in my code?
I solved this issue with the help of a Sencha folk. Thanks Dan. Here is the solution:
- run the sample on a web server as loading JSON files from the file system can sometimes cause problems.
Structure the json data as below
{ "data": [ { "School": "Dukes", "wins": "3" }, { "School": "Emmaus", "wins": "10" }, { "School": "Maryland", "wins": "5" }, { "School": "Virginia", "wins": "2" } ] }Use the below data store
window.store1 = new Ext.data.Store({ model: 'Details', proxy: { type: 'ajax', url: 'GetDataset.json', reader: { root: 'data', type: 'json' } }, autoLoad: true });
I'm guessing here, but it seems like a problem I've had before. I believe the problem is with the proxy. Try:
proxy: {
type: 'rest',
url: 'http://localhost:2650/AjaxWCFService.svc/GetDataset',
reader: {
root: 'data'
}
},
Now, you need to define the callback function for the proxy. There's an elegant way with some config, but I honsetly don't know how to do that, so I found out a different solution at the time, the hard way, which is to wrap the JSON which your service returns inside of(like they do here):
Ext.data.JsonP.callback1();
If none of that works, also consider adding the following to your proxy, and emitting a 'total' as part of your JSON response.
totalProperty: 'total'
But keep in mind that I really don't think this will help much at all and that I'm just throwing these ideas out based on a working sample I have.
Try reading this and this. And most of all good luck, that's all of the top of my head mate. Also have a look at this post.
I hope that points you in the right direction. Like I said, I'm not sure, this is my best guess. I'm probably wrong.
Cheers rivanov
来源：https://stackoverflow.com/questions/10203872/cant-get-json-datastore-into-extjs-sencha-touch-chart-displays-error-cannot