javascript Extjs 4 - 为树形面板创建模型
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Extjs 4 - creating a model for a tree panel
提问by nightwatch
I would like to implement a tree panel with content loaded dynamically from the server (as Json) and with a custom data model. But I dont know how to define a model and a data store for that tree. Can you provide some examples? If possible, I'd like to conform to the sencha mvc recommendations (the model and the data store defined as separate classes). I knew how to do it in extjs 3 but i'm lost in version 4.
我想实现一个树面板，其中包含从服务器动态加载的内容（如 Json）和自定义数据模型。但我不知道如何为该树定义模型和数据存储。你能提供一些例子吗？如果可能，我想遵守 sencha mvc 建议（模型和数据存储定义为单独的类）。我知道如何在 extjs 3 中做到这一点，但我在版本 4 中迷失了方向。
Best regards RG
最好的问候 RG
回答by Andrey Selitsky
I experimented with a new MVC approach recently, and I managed to get it work with the treepanel. Nothing special actually:
我最近尝试了一种新的 MVC 方法，我设法让它与树面板一起工作。其实没什么特别的：
View:
看法：
Ext.define('RoleBuilder.view.RoleList', {
extend: 'Ext.tree.Panel',
alias: 'widget.roles',
title: 'Roles',
store: 'Roles'
});
Store:
店铺：
Ext.define('RoleBuilder.store.Roles', {
extend: 'Ext.data.TreeStore',
model: 'RoleBuilder.model.Role',
requires: 'RoleBuilder.model.Role',
root: {
text: 'Roles',
expanded: true
},
proxy: {
type: 'ajax',
url: loadRolesUrl,
actionMethods: 'POST',
reader: {
type: 'json'
}
}
});
Model:
模型：
Ext.define('RoleBuilder.model.Role', {
extend: 'Ext.data.Model',
fields: [
{ name: 'id', type: 'int', mapping: 'Id' },
{ name: 'text', type: 'string', mapping: 'Text' },
{ name: 'leaf', type: 'boolean', mapping: 'Leaf' },
{ name: 'loaded', type: 'boolean', mapping: 'Loaded', defaultValue: false },
{ name: 'Properties'},
{ name: 'expanded', defaultValue: true }
]
});
Controller:
控制器：
Ext.define('RoleBuilder.controller.RoleList', {
extend: 'Ext.app.Controller',
init: function () {
this.control({
'roles': {
itemcontextmenu: this.onItemContextMenuClick,
itemclick: this.onItemClick
}
});
this.application.on({
'role-saved': Ext.Function.bind(this.onRoleSaved, this)
});
},
..... too long, but you got the idea.
Hope it will help.
希望它会有所帮助。
回答by user982513
I struggle so much to get this working. I want to share with you in case you need it.
我努力让这个工作。我想与你分享，以备不时之需。
Here is my view:
这是我的观点：
Ext.define("GiipIq.view.Problem", {
extend: "Ext.window.Window",
alias: "widget.problemwindow",
titleAlign: "center",
closable: false,
layout: "border",
autoShow: true,
maximizable: true,
draggable: false,
resizable: false,
x: 0,
y: 0,
width: Ext.getBody().getViewSize().width/2,
height: Ext.getBody().getViewSize().height/2,
id: "problem-window",
getEastPanel: function() {
return {
region: "west",
xtype: "treepanel",
title: "Problems",
width: 200,
split: true,
collapsible: false,
floatable: false,
rootVisible: false,
useArrows: true,
store: Ext.create("GiipIq.store.Problems"),
id: "problems",
dockedItems: [{
xtype: "toolbar",
dock: "bottom",
layout: "fit",
items: [{
xtype: "button",
text: 'Click to Run Selected Problems',
id: "run-problems-button"
}]
}],
listeners: {
checkchange: function(node, checkedStatus, options) {
console.log("vp");
}
}
};
},
getCentralPanel: function() {
return {
xtype: "tabpanel",
width: (Ext.getBody().getViewSize()/2) - 200,
bodyBorder: false,
items: [{
title: "Problem Description",
id: "problem-description-tab"
},{
xtype: "panel",
title: "Source Code",
},{
xtype: "panel",
title: "Big O Analysis",
}]
};
},
initComponent: function () {
this.items = [
this.getEastPanel(),
this.getCentralPanel()
];
this.callParent(arguments);
}
});
Here is my store:
这是我的商店：
Ext.define("GiipIq.store.Problems", {
extend: "Ext.data.TreeStore",
storeId:"problems-store",
model: "GiipIq.model.Problem",
});
Here is my model:
这是我的模型：
Ext.define("GiipIq.model.Problem", {
extend: "Ext.data.Model",
fields: [
{ name: "text", type: "string" },
{ name: "leaf", type: "bool" },
{ name: "expanded", type: "bool" },
{ name: "checked", type: "bool" }
],
proxy: {
type: "ajax",
actionMethods: { read: "GET" },
api: { read: "app/problems.json", },
reader: {
type: "json",
root: "children"
},
listeners: {
exception: function(proxy, response, operation, opts) {
if(typeof(operation.error) == "string") {
Ext.Msg.alert("Error", "Connection to server interrupted" + operation.error);
}
}
}
}
});
Here is my json:
这是我的 json：
{
success: true,
children: [{
text: "algorithms", expanded: true, leaf: false, checked: false, children: [
{ text: "bit manipulation", leaf: true, checked: true },
{ text: "brain teaser", leaf: true, checked: true }
]
},{
text: "data structures", expanded: true, checked: false, leaf: false, children: [
{ text: "array and strings", leaf: true, checked: true },
{ text: "linked lists", leaf: true, checked: false}
]
},{
text: "knowledge based", expanded: true, leaf: false, checked: false, children: [
{ text: "C and C++", leaf: true, checked: false},
{ text: "Java", leaf: true, checked: false}
]
}]
}
