En este artículo, analizaremos la eliminación de Backbone.js de la colección. La colección de eliminación de Backbone.js se usa para eliminar un modelo o una array de modelos de la colección dada.
Sintaxis:
collection.remove(models,options)
Parámetros: Tomará dos parámetros.
- modelos: este es el primer parámetro que se utiliza para especificar los nombres de las instancias,
- opciones: este parámetro toma el tipo de modelo que se eliminará de la colección dada.
Ejemplo 1: En este ejemplo, crearemos un modelo Food y eliminaremos food1 usando el método remove.
HTML
<!DOCTYPE html>
<html>
<head>
<title>Example of Backbone.js</title>
<script src="https://code.jquery.com/jquery-2.1.3.min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js"
type="text/javascript"></script>
<script type="text/javascript">
// 'Food' is a model and that contains the
// default value for the model
var Food = Backbone.Model.extend({
defaults: {
food_name: "Butter",
food_region:"Hyderabad"
}
});
// Here the 'FoodCollection' is a collection instance and model
// 'Food' is specified by overriding the 'model' property
var FoodCollection = Backbone.Collection.extend({
model: Food
});
// The instances "food1" and "food2" are created
// for the model "Food"
var food1 = new Food({name: "Icecream",
country:"Hyderabad"});
var food2 = new Food({name: "cake/chocos",
country:"Guntur"});
// The add() method adds the models 'food1' and 'food2' to
// the collection instance 'final'
var final = new FoodCollection();
final.add([food1,food2]);
// Get the count of total food using length
document.write('Actual Food Count : ' +
final.length);
document.write("<br>");
// Remove food1 model using remove
final.remove([food1]);
document.write('Removed Food Count : ' +
final.length);
</script>
</head>
<body></body>
</html>
Producción:
Actual Food Count : 2 Removed Food Count : 1
Ejemplo 2: en este ejemplo, crearemos un modelo Food y eliminaremos food1 y food3 usando remove:
HTML
<!DOCTYPE html>
<html>
<head>
<title>Example of Backbone.js remove</title>
<script src="https://code.jquery.com/jquery-2.1.3.min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js"
type="text/javascript"></script>
<script type="text/javascript">
// 'Food' is a model and that contains the
// default value for the model
var Food = Backbone.Model.extend({
defaults: {
food_name: "Butter",
food_region: "Hyderabad"
}
});
// Here the 'FoodCollection' is a collection instance and model
// 'Food' is specified by overriding the 'model' property
var FoodCollection = Backbone.Collection.extend({
model: Food
});
// The instances "food1","food2" and "food3" are
// created for the model "Food"
var food1 = new Food({
name: "Icecream",
country: "Hyderabad"
});
var food2 = new Food({
name: "cake/chocos",
country: "Guntur"
});
var food3 = new Food({
name: "drinks",
country: "Guntur"
});
// The add() method adds the models 'food1' and
// 'food2' to the collection instance 'final'
var final = new FoodCollection();
final.add([food1, food2, food3]);
// get the food using toJSON
document.write('Actual Food : ' +
JSON.stringify(final.toJSON()));
document.write("<br>");
document.write("<br>");
// Remove food1 and food3 model using remove
final.remove([food1, [food3]]);
// Get the food using toJSON
document.write('After Removal of food1 and food3 : ' +
JSON.stringify(final.toJSON()));
</script>
</head>
<body></body>
</html>
Producción:
Actual Food : [
{"name":"Icecream","country":"Hyderabad",
"food_name":"Butter","food_region":"Hyderabad"},
{"name":"cake/chocos","country":"Guntur",
"food_name":"Butter","food_region":"Hyderabad"},
{"name":"drinks","country":"Guntur",
"food_name":"Butter","food_region":"Hyderabad"}
]
After Removal of food1 and food3 : [
{"name":"cake/chocos","country":"Guntur",
"food_name":"Butter","food_region":"Hyderabad"},
{"name":"drinks","country":"Guntur",
"food_name":"Butter","food_region":"Hyderabad"}
]
Publicación traducida automáticamente
Artículo escrito por bhanusivanagulug y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA