问题
I have this collection from DataBase:
var items = [{ 'Name':'Michael', 'TypeId':1 }
{ 'Name':'Max', 'TypeId':1 }
{ 'Name':'Andre', 'TypeId':1 }
{ 'Name':'Georg', 'TypeId':2 }
{ 'Name':'Greg', 'TypeId':3 }
{ 'Name':'Mitchell', 'TypeId':2 }
{ 'Name':'Ptro', 'TypeId':1 }
{ 'Name':'Helga', 'TypeId':1 }
{ 'Name':'Seruin', 'TypeId':2 }
{ 'Name':'Ann', 'TypeId':3 }
{ 'Name':'Marta', 'TypeId':2 }]
I need to sort this items by TypeId increasing.
Like that:
var itemsSorted = [{ 'Name':'Michael', 'TypeId':1 }
{ 'Name':'Max', 'TypeId':1 }
{ 'Name':'Andre', 'TypeId':1 }
{ 'Name':'Ptro', 'TypeId':1 }
{ 'Name':'Helga', 'TypeId':1 }
{ 'Name':'Georg', 'TypeId':2 }
{ 'Name':'Mitchell', 'TypeId':2 }
{ 'Name':'Marta', 'TypeId':2 }]
{ 'Name':'Seruin', 'TypeId':2 }
{ 'Name':'Greg', 'TypeId':3 }
{ 'Name':'Ann', 'TypeId':3 }
Is there any built in function in JavaScript that can sort array of objects by property?
回答1:
You could use orderBy
filter.
var itemsSorted = $filter('orderBy')(items, 'TypeId')
On View
ng-repeat="item in items | orderBy: 'TypeId'"
By default filters are ascending(explicit would be +TypeId
), you could use -TypeId
to make it descending.
Additional Stuff
If you wanted to sort by multiple properties then do use array instead of string
like ['TypeId', 'Name']
ng-repeat="item in items | orderBy: ['TypeId', 'Name']"
There is big performance benefit you get when you do manual filtering inside controller. where as filtering on view is slower as it evaluates ng-repeat
express and bindings each time when digest cycle fire. Generally you won't see any performance hit in small collection, but in bigger collection you will see filtering on view will work slow.
回答2:
You can use js sort
function & ternary operator
var items = [{ 'Name':'Michael', 'TypeId':1 },
{ 'Name':'Max', 'TypeId':1 },
{ 'Name':'Andre', 'TypeId':1 },
{ 'Name':'Georg', 'TypeId':2 },
{ 'Name':'Greg', 'TypeId':3 },
{ 'Name':'Mitchell', 'TypeId':2 },
{ 'Name':'Ptro', 'TypeId':1 },
{ 'Name':'Helga', 'TypeId':1 },
{ 'Name':'Seruin', 'TypeId':2 },
{ 'Name':'Ann', 'TypeId':3 },
{ 'Name':'Marta', 'TypeId':2 }]
var sortedArray = items.sort(function(a,b){
return a.TypeId >b.TypeId?1:a.TypeId <b.TypeId?-1:0
})
console.log(sortedArray);
JSFIDDLE Example
回答3:
In a template:
<li ng-repeat="item in items | orderBy:'TypeId'">...</li>
In a controller/service:
vm.sortedItems = $filter('orderBy')(items, 'TypeId');
回答4:
You can use Array.prototype.sort:
var items = [{ 'Name':'Michael', 'TypeId':1 },
{ 'Name':'Max', 'TypeId':1 },
{ 'Name':'Andre', 'TypeId':1 },
{ 'Name':'Georg', 'TypeId':2 },
{ 'Name':'Greg', 'TypeId':3 },
{ 'Name':'Mitchell', 'TypeId':2 },
{ 'Name':'Ptro', 'TypeId':1 },
{ 'Name':'Helga', 'TypeId':1 },
{ 'Name':'Seruin', 'TypeId':2 },
{ 'Name':'Ann', 'TypeId':3 },
{ 'Name':'Marta', 'TypeId':2 }];
items.sort(function(a, b) { return a.TypeId - b.TypeId; })
console.table(items);
document.getElementById('demo').innerHTML = JSON.stringify(items, null, 4);
<pre id="demo"></pre>
来源:https://stackoverflow.com/questions/36667731/sorting-array-of-objects-by-property