En este artículo, discutiremos la colección pop La colección pop Backbone.js se usa para eliminar un modelo o una array de modelos de la colección dada. Es similar al método de eliminación.
Sintaxis:
collection.pop(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 pop.
HTML
<!DOCTYPE html>
<html>
<head>
<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"
}
});
// 'FoodCollection' is a collection instance and
// 'Food' is specified by overriding the 'model' property
var FoodCollection = Backbone.Collection.extend({
model: Food
});
// "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"});
// 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 pop
final.pop([food1]);
document.write('Popped Food Count : ' + final.length);
</script>
</head>
<body></body>
</html>
Producción:
Actual Food Count : 2 Popped Food Count : 1
Ejemplo 2 : en este ejemplo, crearemos un modelo Food y eliminaremos food1 y food3 usando pop.
HTML
<!DOCTYPE html>
<html>
<head>
<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"
}
});
// 'FoodCollection' is a collection instance and
// 'Food' is specified by overriding the 'model' property
var FoodCollection = Backbone.Collection.extend({
model: Food
});
// "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"});
// add() method adds the models 'food1' and 'food2'
// to the collection instance 'final'
var final = new FoodCollection();
final.add([food1,food2,food3]);
// get the count of total food using length
document.write('Actual Food Count : ' + final.length);
document.write("<br>");
// remove food1 and food3 model using pop
final.pop([food1,[food3]]);
document.write('Removed Food Count : ' + final.length);
</script>
</head>
<body></body>
</html>
Producción:
Actual Food Count : 3 Removed Food Count : 2
Publicación traducida automáticamente
Artículo escrito por bhanusivanagulug y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA