Question

EasyUi的Combobox如何选中某项值？

$('#combo').combobox('select','菜单项');
用这句代码，可以选中combobox中的某一项值
但是combobox中的数据如果是对象，用上面这句代码就选不中了
要怎么才能选中对象呢？

[{
"id":1,
"text":"text1"
},{
"id":2,
"text":"text2"
}]

$('#cc').combobox({
url:'combobox_data.json',
valueField:'id',
textField:'text'
});

Answer 1

1.添加combobox后做如下设置

2.根据自己的需要在类中重写如下方法

// ==========================================================
// Combo box data source methods
// ==========================================================
- (NSInteger) numberOfItemsInComboBox: (NSComboBox *) aComboBox {
#pragma unused (aComboBox)
return ([dataSource count]);
}
- (id) comboBox: (NSComboBox *) aComboBox objectValueForItemAtIndex: (NSInteger) index {
#pragma unused (aComboBox)
return [dataSource objectAtIndex:index];
}
- (NSUInteger) comboBox: (NSComboBox *) aComboBox indexOfItemWithStringValue: (NSString *) string {
#pragma unused (aComboBox)
return [dataSource indexOfObject:string];
}

- (NSString *) firstGenreMatchingPrefix: (NSString *) prefix {
NSString *string = nil;
NSString *lowercasePrefix = [prefix lowercaseString];
NSEnumerator *stringEnum = [dataSource objectEnumerator];

while ( string = [stringEnum nextObject] )
if ([[string lowercaseString] hasPrefix:lowercasePrefix] ) {
return (string) ;
}

return (nil);
} // firstGenreMatchingPrefix

- (NSString *) comboBox: (NSComboBox *) aComboBox completedString: (NSString *) inputString {
#pragma unused (aComboBox)
// This method is received after each character typed by the user, because we have checked the "completes" flag for
// genreComboBox in IB.
// Given the inputString the user has typed, see if we can find a genre with the prefix, and return it as the suggested complete
// string.
NSString *candidate = [self firstGenreMatchingPrefix:inputString];
return (candidate ? candidate : inputString);
}
这些方法实现combobox在选择选项、自动完成时的处理方式。其中dataSource为NSArray。
3.设置combobox的datasource为实现上述方法的对象即可。

Answer 2

$('#combobox).combobox('getValue')
获取当前选中的值$
('#combobox).combobox('getText')