Ext js sorting custom column by contents - sorting

Question

I have a grid in ext with some custom columns, and I want to be able to sort this column - I want to sort it by what is displayed inside of it, but really I just cannot figure out how to define a sorter for a column that will not be based on the dataIndex - I tried using a custom model, but I could not get that to work.
{
text: 'Parent',
dataIndex: 'Parent',
renderer: function(value, meta, record) {
var ret = record.raw.Parent;
if (ret) {
return ret.Name;
} else {
meta.tdCls = 'invisible';
return record.data.Name;
}
},
sortable: true
},

Answer 1

You should be able to override the doSort method of the column. Here's the gist of it. I also created a working fiddle (http://jsfiddle.net/cfarmerga/LG5uA/). The fiddle uses the string length of a field as the property to sort on, but of course you could apply your own custom sort logic.
var grid = Ext.create('Ext.grid.Panel',{
//...
columns: [
{ text: 'name', dataIndex: 'name', sortable: true },
{
text: 'Custom',
sortable : true,
dataIndex: 'customsort',
doSort: function(state) {
var ds = this.up('grid').getStore();
var field = this.getSortParam();
ds.sort({
property: field,
direction: state,
sorterFn: function(v1, v2){
v1 = v1.get(field);
v2 = v2.get(field);
return v1.length > v2.length ? 1 : (v1.length < v2.length ? -1 : 0);
}
});
}
}
]
//....
});

Answer 2

For Ext JS version 5, it looks like doSort was taken out, so I couldn't override that. Instead, I went the route of listening to the sortchange event, and from there, I used the Ext.data.Store.setSorters method. The code is a bit custom, and overly complex because of the data that I'm using, so keep that in mind (Fiddle here):
// grid class
initComponent: function() {
...
this.on('sortchange', this.onSortChange, this);
},
onSortChange: function(container, column, direction, eOpts) {
// check for dayColumnIndex
if (column && column.dayColumnIndex !== undefined) {
this.sortColumnByIndex(column.dayColumnIndex, direction);
}
},
sortColumnByIndex: function(columnIndex, direction) {
var store = this.getStore();
if (store) {
var sorterFn = function(rec1, rec2) {
var sortValue = false;
if (rec1 && rec2) {
var day1;
var daysStore1 = rec1.getDaysStore();
if (daysStore1) {
day1 = daysStore1.getAt(columnIndex);
}
var day2;
var daysStore2 = rec2.getDaysStore();
if (daysStore2) {
day2 = daysStore2.getAt(columnIndex);
}
if (day1 && day2) {
var val1 = day1.get('value');
var val2 = day2.get('value');
sortValue = val1 > val2 ? 1 : val1 === val2 ? 0 : -1;
}
}
return sortValue;
};
if (direction !== 'ASC') {
sorterFn = function(rec1, rec2) {
var sortValue = false;
if (rec1 && rec2) {
var day1;
var daysStore1 = rec1.getDaysStore();
if (daysStore1) {
day1 = daysStore1.getAt(columnIndex);
}
var day2;
var daysStore2 = rec2.getDaysStore();
if (daysStore2) {
day2 = daysStore2.getAt(columnIndex);
}
if (day1 && day2) {
var val1 = day1.get('value');
var val2 = day2.get('value');
sortValue = val1 < val2 ? 1 : val1 === val2 ? 0 : -1;
}
}
return sortValue;
};
}
store.setSorters([{
sorterFn: sorterFn
}]);
}
}

Answer 3

There is a convert method on the Ext.data.Model class that allows you to convert the data before it's being used. Then you can just specify this 'dataIndex' in your column and do a normal sort. The column will be sorted by that converted value. Here is the a sample model with just one field (Parent) and with it's corresponding conversion:
Ext.define('MyModel', {
extend: 'Ext.data.Model',
fields: [
{name: 'Parent', type: 'string', convert: sortParent},
// other fields...
],
sortParent: function(value, record) {
var ret = record.raw.Parent;
if (ret) {
return ret.Name;
} else {
meta.tdCls = 'invisible';
return record.data.Name;
}
}
});