需求：需要根据数据动态显示Gridpanel的列。
思路：将json数据取出，然后遍历json首行的列。已拼接字符串的形式来生成columnModel和store的fields字段值。
代码如下：
json数据(createcol.json)：
{
'coders': [
{ 'pro':'ADM','id': '1', 'name': 'McLaughlin', 'descn': 'brett@newInstance.com','test':'test' },
{ 'pro':'RMS','id': '2', 'name': 'Hunter', 'descn': 'jason@servlets.com' },
{ 'pro':'fdks','id': '3', 'name': 'Harold', 'descn': 'elharo@macfaq.com' },
{ 'pro':'fkas','id': '4', 'name': 'Harolds', 'descn': 'elhaross@macfaq.com' },
{ 'pro':'qfks','id': '5', 'name': 'Karolds', 'descn': 'lhaross@macfaq.com' },
{ 'pro':'wfks','id': '6', 'name': 'Yarolds', 'descn': 'elaross@macfaq.com' },
{ 'pro':'efks','id': '7', 'name': 'Jarolds', 'descn': 'elharss@macfaq.com' },
{ 'pro':'rfks','id': '8', 'name': 'Larolds', 'descn': 'elhass@macfaq.com' },
{ 'pro':'tfks','id': '9', 'name': 'Haroldws', 'descn': 'elhaross@macfaq.com' },
{ 'pro':'yfks','id': '10', 'name': 'WHarolds', 'descn': 'elhaross@macfaq.com' }
]
}
js代码：
Ext.onReady(function() {
/**
* 同步ajax调用 返回json Object
*
* @param {}
* urlStr
* @param {}
* paramsStr 为字符串键值对形式"key=value&key2=value2"
* @return {} 返回json Object
*/
function ajaxSyncCall(urlStr) {
var obj;
var result;
//For IE
if (window.ActiveXObject) {
obj = new ActiveXObject('Microsoft.XMLHTTP');
}
//For Not IE
else if (window.XMLHttpRequest) {
obj = new XMLHttpRequest();
}
obj.onreadystatechange = function() {
if (obj.readyState == 4 && obj.status == 200) {
result = obj.responseText;
}
}
//param:Type:'get/post';URL;sync(是否异步传输)
obj.open('GET', urlStr, false);
//obj.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
obj.send(null);
return result;
}
var sm = new Ext.grid.CheckboxSelectionModel();
var rn = new Ext.grid.RowNumberer()
var proj = {
header: "pro",
//renderTo:"hello",
dataIndex: "pro",
editor: { xtype: 'textfield',
allowBlank: false
}
};
//返回model和store的fields字段值
function getFields() {
var col = "[rn,sm,";
var stor_str = "[";
var result = "";
var json = Ext.util.JSON.decode(ajaxSyncCall("creatcol.json?id=" + Math.random()));
//遍历外层对象
for (data in json) {
//第二层循环,遍历数组
for (dt1 in json[data]) {
//第三层循环，遍历hash数据
for (dt2 in json[data][dt1]) {
//将header和dataIndex的值一hash格式传到数组中，在声明columnModel时用
//var temp = {};
col += "{header:" + "'" + dt2 + "',";
col += "dataIndex:" + "'" + dt2 + "',";
//col += sm+"'"+dt2+"',";
//col +=new Ext.grid.RowNumberer()+"'"+dt2+"',";
col += "editor:{ xtype:'textfield',allowBlank: false}},";
stor_str += "{name:" + "'" + dt2 + "'},";
}
col = col.substring(0, col.lastIndexOf(","));
stor_str = stor_str.substring(0, stor_str.lastIndexOf(","));
col += "]";
stor_str += "]";
result = col + "$" + stor_str;
return result;
}
}
}
var result = getFields(); alert(result);
var index = result.indexOf("$");
var columnModel = result.substring(0, index);
var storeStr = result.substring(index + 1);
// var sm = new Ext.grid.CheckboxSelectionModel();
var cm = new Ext.grid.ColumnModel(
//new Ext.grid.RowNumberer(),
//sm,
eval(columnModel)
);
cm.defaultSortable = true;
// ArrayReader
var store = new Ext.data.Store({
root: 'coders',
//remoteSort: true,
proxy: new Ext.data.HttpProxy({
url: 'creatcol.json?id=' + Math.random(),
method: 'GET'
}),
reader: new Ext.data.JsonReader({
idProperty: 'threadid',
root: 'coders'
}, eval(storeStr))
});
store.load({ params: { start: 0, limit: 5} });
var tbar = [
new Ext.Toolbar.TextItem('Tools bar:'),
{ xtype: "tbfill" }, {
pressed: true,
text: "Refresh",
handler: function() {
Ext.Msg.alert("Refresh", "Refresh!")
}
}, {
xtype: "tbfill"
}, {
pressed: true,
text: "Selection"
}, {
xtype: "tbseparator"
}, {
pressed: true,
text: "Add",
handler: function() { Ext.Msg.alert("Add", "add infro!") }
}, {
xtype: "tbseparator"
}, {
pressed: true,
text: "save",
handler: function() {
Ext.Msg.alert("Save", "save infro successed!!!")
}
}, {
xtype: "tbseparator"
}
];
var grid = new Ext.grid.EditorGridPanel({
draggable: true,
store: store,
cm: cm,
el: grid,
renderTo: 'w',
width: 630,
height: 320,
loadMask: true,
//tbar:tbar,
tools: [{ id: "save" }, {
id: "help",
handler: function() { Ext.Msg.alert("Help", "Need help!") }
}, {
id: "close",
handler: function() { grid.hide(); }
}],
bbar: [
new Ext.PagingToolbar({
store: store,
pageSize: 5,
displayInfo: true,
displayMsg: "Displaying {0} - {1} of {2}",
emptyMsg: "No data to display",
items: ['-', {
pressed: true,
enableToggle: true,
text: 'show preview',
cls: 'x-btn-text-icon details',
toggleHandler: function(btn, pressed) {
var view = grid.getView();
view.showPreview = pressed;
view.refresh();
}
}]
})
],
collapsible: true,
multiSelect: true,
title: 'Edit Plants',
frame: true,
clicksToEdit: 2,
trackMouseOver: true,
// viewConfig: {
stripeRows: true,
enableTextSelection: true
//}
});
grid.render();
});