ExtJS 5.1:将记录值绑定到组件属性 [英] ExtJS 5.1: Binding record value to component property
问题描述
状态
字段隐藏或显示一个按钮,所以我想到做一些绑定。然而,看起来绑定只限于反转,而不是实际使用表达式。要更好地了解,请查看此代码: Ext.application({
name:'Fiddle',
launch:function(){
Ext.define('User',{
extends:'Ext.data.Model',
fields:['name','status']
});
Ext.define('UserListController',{
extends:'Ext.app.ViewController',
alias:'controller.userlist'
});
Ext.define('UserListViewModel',{
extends:'Ext.app.ViewModel',
alias:'viewmodel.userlist'
});
Ext.define('UserList',{
extends:'Ext.form.Panel',
controller:'userlist',
viewModel:'userlist',
tbar:[{
text:'Add',
参考:'addButton',
bind:{
// hidden:'{status == 2}'
}
},{
文本:'删除',
引用:'deleteButton',
bind:{
//隐藏:'{status == 1}'
}
}
items:[{
xtype:'displayfield',
name:'name',
fieldLabel:'Name'
},{
xtype: 'displayfield',
name:'status',
fieldLabel:'Status'
}]
});
var myForm = Ext.create('UserList',{
width:400,
height:200,
renderTo:Ext.getBody()
});
var record = Ext.create('User',{
name:'blah',
status:2
});
myForm.loadRecord(record);
if(record.get('status')=== 2){
myForm.lookupReference('addButton')。hide();
}
}
});
正如你所看到的,我目前只是探测记录的值来隐藏addButton。有没有办法用绑定或其他方法来完成这个?很高兴地注意到,我也看过公式,但是从我的理解来看,这只是为了改变数据的呈现方式,所以看起来不是正确的路线。
如果您的记录是视图模型数据的一部分 - 请使用公式,如:
formula:{
hideDeleteButton:function(getter){
return getter('record.status')=== 2;
},
hideAddButton:function(getter){
return getter('record.status')=== 1;
}
}
然后在你的视图中你可以绑定: p>
{
文本:'添加',
引用:'addButton',
bind:{
hidden:'{hideAddButton}'
}
},{
text:'Delete',
reference:'deleteButton',
bind:
hidden:'{hideDeleteButton}'
}
}
一个工作实例: https://fiddle.sencha.com/#fiddle/mcg
Let's say I've got a ViewController, ViewModel, and my View. In the View, I've got a form panel that gets a loaded record. When this record loads into the form, I want to hide or show a button based on the record's status
field, so I figured do something with binding. However, it looks like binding is limited to only inverting, not actually using an expression. To get a better understanding, take a look at this code:
Ext.application({
name : 'Fiddle',
launch : function() {
Ext.define('User', {
extend: 'Ext.data.Model',
fields: ['name', 'status']
});
Ext.define('UserListController', {
extend : 'Ext.app.ViewController',
alias: 'controller.userlist'
});
Ext.define('UserListViewModel', {
extend: 'Ext.app.ViewModel',
alias: 'viewmodel.userlist'
});
Ext.define('UserList', {
extend: 'Ext.form.Panel',
controller: 'userlist',
viewModel: 'userlist',
tbar: [{
text: 'Add',
reference: 'addButton',
bind: {
//hidden: '{status == 2}'
}
}, {
text: 'Delete',
reference: 'deleteButton',
bind: {
//hidden: '{status == 1}'
}
}],
items: [{
xtype: 'displayfield',
name: 'name',
fieldLabel: 'Name'
}, {
xtype: 'displayfield',
name: 'status',
fieldLabel: 'Status'
}]
});
var myForm = Ext.create('UserList', {
width: 400,
height: 200,
renderTo: Ext.getBody()
});
var record = Ext.create('User', {
name: 'blah',
status: 2
});
myForm.loadRecord(record);
if (record.get('status') === 2) {
myForm.lookupReference('addButton').hide();
}
}
});
As you can see, I'm currently just probing the values of the record to hide the addButton. Is there anyway I can accomplish this with binding or some other approach? It's good to note that I also looked at formulas, but from what I'm understanding, that's only for changing how data is rendered, so it didn't seem like the proper route.
If your record is part of the view model data - use formulas, like:
formulas: {
hideDeleteButton: function (getter) {
return getter('record.status') === 2;
},
hideAddButton: function (getter) {
return getter('record.status') === 1;
}
}
And then in your view you can bind:
{
text: 'Add',
reference: 'addButton',
bind: {
hidden: '{hideAddButton}'
}
}, {
text: 'Delete',
reference: 'deleteButton',
bind: {
hidden: '{hideDeleteButton}'
}
}
A working example: https://fiddle.sencha.com/#fiddle/mcg
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