ExtJs Grid 合计 [Ext | GridPanel | GridSummary]
2010-09-14 13:45:37 来源:WEB开发网2. 实现统计功能的 GroupSummary.js,本代码来源于 http://extjs.com/forum/showthread.php?t=21331。这里没有用自带例子里面的GroupSummary.js,因为在我这边报错。
Ext.ns('Ext.ux.grid');
Ext.ux.grid.GridSummary = function(config) {
Ext.apply(this, config);
};
Ext.extend(Ext.ux.grid.GridSummary, Ext.util.Observable, {
init : function(grid) {
this.grid = grid;
this.cm = grid.getColumnModel();
this.view = grid.getView();
var v = this.view;
// override GridView's onLayout() method
v.onLayout = this.onLayout;
v.afterMethod('render', this.refreshSummary, this);
v.afterMethod('refresh', this.refreshSummary, this);
v.afterMethod('syncScroll', this.syncSummaryScroll, this);
v.afterMethod('onColumnWidthUpdated', this.doWidth, this);
v.afterMethod('onAllColumnWidthsUpdated', this.doAllWidths, this);
v.afterMethod('onColumnHiddenUpdated', this.doHidden, this);
// update summary row on store's add/remove/clear/update events
grid.store.on({
add: this.refreshSummary,
remove: this.refreshSummary,
clear: this.refreshSummary,
update: this.refreshSummary,
scope: this
});
if (!this.rowTpl) {
this.rowTpl = new Ext.Template(
'<div class="x-grid3-summary-row x-grid3-gridsummary-row-offset">',
'<table class="x-grid3-summary-table" border="0" cellspacing="0" cellpadding="0" style="{tstyle}">',
'<tbody><tr>{cells}</tr></tbody>',
'</table>',
'</div>'
);
this.rowTpl.disableFormats = true;
}
this.rowTpl.compile();
if (!this.cellTpl) {
this.cellTpl = new Ext.Template(
'<td class="x-grid3-col x-grid3-cell x-grid3-td-{id} {css}" style="{style}">',
'<div class="x-grid3-cell-inner x-grid3-col-{id}" unselectable="on" {attr}>{value}</div>',
"</td>"
);
this.cellTpl.disableFormats = true;
}
this.cellTpl.compile();
},
calculate : function(rs, cm) {
var data = {}, cfg = cm.config;
for (var i = 0, len = cfg.length; i < len; i++) { // loop through all columns in ColumnModel
var cf = cfg[i], // get column's configuration
cname = cf.dataIndex; // get column dataIndex
// initialise grid summary row data for
// the current column being worked on
data[cname] = 0;
if (cf.summaryType) {
for (var j = 0, jlen = rs.length; j < jlen; j++) {
var r = rs[j]; // get a single Record
data[cname] = Ext.ux.grid.GridSummary.Calculations[cf.summaryType](r.get(cname), r, cname, data, j);
}
}
}
return data;
},
onLayout : function(vw, vh) {
if (Ext.type(vh) != 'number') { // handles grid's height:'auto' config
return;
}
// note: this method is scoped to the GridView
if (!this.grid.getGridEl().hasClass('x-grid-hide-gridsummary')) {
// readjust gridview's height only if grid summary row is visible
this.scroller.setHeight(vh - this.summary.getHeight());
}
},
syncSummaryScroll : function() {
var mb = this.view.scroller.dom;
this.view.summaryWrap.dom.scrollLeft = mb.scrollLeft;
this.view.summaryWrap.dom.scrollLeft = mb.scrollLeft; // second time for IE (1/2 time first fails, other browsers ignore)
},
doWidth : function(col, w, tw) {
var s = this.view.summary.dom;
s.firstChild.style.width = tw;
s.firstChild.rows[0].childNodes[col].style.width = w;
},
doAllWidths : function(ws, tw) {
var s = this.view.summary.dom, wlen = ws.length;
s.firstChild.style.width = tw;
var cells = s.firstChild.rows[0].childNodes;
for (var j = 0; j < wlen; j++) {
cells[j].style.width = ws[j];
}
},
doHidden : function(col, hidden, tw) {
var s = this.view.summary.dom,
display = hidden ? 'none' : '';
s.firstChild.style.width = tw;
s.firstChild.rows[0].childNodes[col].style.display = display;
},
renderSummary : function(o, cs, cm) {
cs = cs || this.view.getColumnData();
var cfg = cm.config,
buf = [],
last = cs.length - 1;
for (var i = 0, len = cs.length; i < len; i++) {
var c = cs[i], cf = cfg[i], p = {};
p.id = c.id;
p.style = c.style;
p.css = i == 0 ? 'x-grid3-cell-first ' : (i == last ? 'x-grid3-cell-last ' : '');
if (cf.summaryType || cf.summaryRenderer) {
p.value = (cf.summaryRenderer || c.renderer)(o.data[c.name], p, o);
} else {
p.value = '';
}
//此处设置默认不显示时用什么符号标记
if (p.value == undefined || p.value === "") p.value = "-";
buf[buf.length] = this.cellTpl.apply(p);
}
return this.rowTpl.apply({
tstyle: 'width:' + this.view.getTotalWidth() + ';',
cells: buf.join('')
});
},
refreshSummary : function() {
var g = this.grid, ds = g.store,
cs = this.view.getColumnData(),
cm = this.cm,
rs = ds.getRange(),
data = this.calculate(rs, cm),
buf = this.renderSummary({data: data}, cs, cm);
if (!this.view.summaryWrap) {
this.view.summaryWrap = Ext.DomHelper.insertAfter(this.view.scroller, {
tag: 'div',
cls: 'x-grid3-gridsummary-row-inner'
}, true);
}
this.view.summary = this.view.summaryWrap.update(buf).first();
},
toggleSummary : function(visible) { // true to display summary row
var el = this.grid.getGridEl();
if (el) {
if (visible === undefined) {
visible = el.hasClass('x-grid-hide-gridsummary');
}
el[visible ? 'removeClass' : 'addClass']('x-grid-hide-gridsummary');
this.view.layout(); // readjust gridview height
}
},
getSummaryNode : function() {
return this.view.summary
}
});
Ext.reg('gridsummary', Ext.ux.grid.GridSummary);
/*
* all Calculation methods are called on each Record in the Store
* with the following 5 parameters:
*
* v - cell value
* record - reference to the current Record
* colName - column name (i.e. the ColumnModel's dataIndex)
* data - the cumulative data for the current column + summaryType up to the current Record
* rowIdx - current row index
*/
Ext.ux.grid.GridSummary.Calculations = {
sum : function(v, record, colName, data, rowIdx) {
return data[colName] + Ext.num(v, 0);
},
count : function(v, record, colName, data, rowIdx) {
return rowIdx + 1;
},
max : function(v, record, colName, data, rowIdx) {
return Math.max(Ext.num(v, 0), data[colName]);
},
min : function(v, record, colName, data, rowIdx) {
return Math.min(Ext.num(v, 0), data[colName]);
},
average : function(v, record, colName, data, rowIdx) {
var t = data[colName] + Ext.num(v, 0), count = record.store.getCount();
return rowIdx == count - 1 ? (t / count) : t;
}
}
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