backbone.jsHow do I sort a collection in Backbone.js?
Backbone.js provides a sort()
method to sort a collection. This method takes a comparator function as an argument, which is used to compare two models in a collection. The comparator function should return a negative number if the first model should come before the second, a positive number if the first model should come after the second, and 0 if they are equal.
For example, to sort a collection of models by their name
attribute, we could do the following:
var sortedCollection = collection.sort(function(model1, model2) {
if (model1.get('name') < model2.get('name')) return -1;
if (model1.get('name') > model2.get('name')) return 1;
return 0;
});
This example code would return a new sorted collection, leaving the original collection unchanged.
Code explanation
collection.sort(function(model1, model2)
: This invokes thesort()
method on the collection, passing in a comparator function as an argument.model1.get('name')
andmodel2.get('name')
: These lines get thename
attribute from each model in the collection.if (model1.get('name') < model2.get('name')) return -1;
: This line compares thename
attributes of the two models, returning -1 if the first model should come before the second.if (model1.get('name') > model2.get('name')) return 1;
: This line compares thename
attributes of the two models, returning 1 if the first model should come after the second.return 0;
: This line returns 0 if the two models are equal.
Helpful links
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