我有两个阵列(contacts& contactsSelected),它们都具有以下类型的结构:
{
id: 1,
name: bob
},
{
id: 213,
name: Rob
}
我正在使用KnockoutJS。我如何迭代contacts()和每行,确定该行的ID是否包含在contactsSelected数组中?在KnockoutJS中,我有类似的东西:
userCardModel.contactsToShow = ko.dependentObservable(function () {
return ko.utils.arrayFilter(this.contacts(), function(contact) {
return /////////////// LOGIC GOES HERE TO See if this contact.id() is contained in the contactsSelected() array
});
}, userCardModel);
由于
答案 0 :(得分:2)
好的,你可以这样做......
var contactsSelectedLength = contacts.length;
for (var i = 0, contactsLength = contacts.length; i++) {
var contact = contacts[i];
for (var j = 0; j < contactsSelectedLength; j++) {
var selectedContact = contactsSelected[j];
if (contact.id == selectedContact.id) {
// It is in there!
}
}
}
答案 1 :(得分:1)
将“contactsSelected”的ID添加为对象的属性,以便使用“in”运算符或“hasOwnProperty”方法以比线性更好的时间访问它们:
var getSelectedIds = function(sel) {
var len=sel.length, o={}, i;
for (i=0; i<len; i++) {
o[sel[i].id] = true;
}
return o;
};
var selectedIds = getSelectedIds(contactsSelected);
(1 in selectedIds); // => true
(2 in selectedIds); // => false
selectedIds.hasOwnProperty(213); // => true
selectedIds.hasOwnProperty(214); // => false