我正在设计一个自定义控件,看起来像这样:
我已经让ComboBox加载Store很好,但我想要做的是使用箭头选择Combo中的下一个和上一个值。我已将Combo上的valueField
设置为Store中的“id”,这不是时尚增量。
我尝试过这样的事情:
// this gets the current record
var currentBanner = this.bannersComboBox.getStore().getById(this.bannersComboBox.getValue());
// this gets the current records index in the store
var currentStoreIndex = this.bannersComboBox.getStore().indexOf(currentBanner);
问题是ComboBox上的setValue()
需要“值”,在这种情况下,我需要做一个简单的setValue(currentValue + 1 [-1])
,或者那种性质的东西。当值不是增量值时,如何增加组合?
如果Combo上有selectNext()
或其他方法,这将非常简单!
答案 0 :(得分:3)
想出来。 :)
var currentBanner = this.bannersComboBox.getStore().getById(this.bannersComboBox.getValue());
var currentStoreIndex = this.bannersComboBox.getStore().indexOf(currentBanner);
var nextBannerValue = this.bannersComboBox.getStore().getAt(currentStoreIndex + 1).get('id')
this.bannersComboBox.setValue(nextBannerValue);
答案 1 :(得分:1)
我更喜欢使用select()而不是setValue()。这是选择下一个组合框项目的代码:
function comboSelectNextItem( combo, suppressEvent ) {
var store = combo.getStore();
var value = combo.getValue();
var index = store.find( combo.valueField, value );
var next_index = index + 1;
var next_record = store.getAt( next_index );
if( next_record ) {
combo.select( next_record );
if( ! suppressEvent ) {
combo.fireEvent( 'select', combo, [ next_record ] );
}
}
}
选择上一个组合框项目的代码:
function comboSelectPrevItem( combo, suppressEvent ) {
var store = combo.getStore();
var value = combo.getValue();
var index = store.find( combo.valueField, value );
var prev_index = index - 1;
var prev_record = store.getAt( prev_index );
if( prev_record ) {
combo.select( prev_record );
if( ! suppressEvent ) {
combo.fireEvent( 'select', combo, [ prev_record ] );
}
}
}
您还可以扩展Ext.form.field.ComboBox以包含这些功能(稍作更改)。例如,您可以将此代码放在应用程序的launch()函数中,以便任何Ext.form.field.Combobox继承这两种方法:
Ext.define( "Ext.form.field.ComboBoxOverride", {
"override": "Ext.form.field.ComboBox",
"selectNextItem": function( suppressEvent ) {
var store = this.getStore();
var value = this.getValue();
var index = store.find( this.valueField, value );
var next_index = index + 1;
var next_record = store.getAt( next_index );
if( next_record ) {
this.select( next_record );
if( ! suppressEvent ) {
this.fireEvent( 'select', this, [ next_record ] );
}
}
},
"selectPrevItem": function( suppressEvent ) {
var store = this.getStore();
var value = this.getValue();
var index = store.find( this.valueField, value );
var prev_index = index - 1;
var prev_record = store.getAt( prev_index );
if( prev_record ) {
this.select( prev_record );
if( ! suppressEvent ) {
this.fireEvent( 'select', this, [ prev_record ] );
}
}
}
});
然后您可以在代码中的任何位置使用这些方法:
var combo = ... // the combo you are working on
combo.selectNextItem(); // select the next item
combo.selectPrevItem(); // select the previous item