has : Returns "true if the attribute is non-null or non-undefined value.
Syntax : model.has(attribute)
if (model.has("attribute name")) {
}
Example
Output :
The model student has name: True
unset :It is used to remove an attribute from a backbone model.
Syntax:model.unset(attribute)
Example
Output :
After unset, student name is:undefined
clear : Removes all attributes of a model.
Syntax:model.clear([options])
Example
After unset, student id is:10
IdAttribute :It gives you model's unique identifier that contains the name of the member of the class, that is use as id.
Example
Syntax : model.has(attribute)
if (model.has("attribute name")) {
}
Example
<!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">
student
= Backbone.Model.extend({
defaults:
{
name:
"",
class:
""
},
initialize:
function
(a, b)
{
this.set("name",
a);
this.set("class",
b);
}
});
var
mymodel = new
student('john',
12);
if
(mymodel.has('name'))
{
document.write("The
model student has name: True");
}
else
{
document.write("The
model student has name: False");
}
</script>
</head>
</html>
The model student has name: True
unset :It is used to remove an attribute from a backbone model.
Syntax:model.unset(attribute)
Example
<!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">
student
= Backbone.Model.extend({
defaults:
{
name:
"",
class:
""
},
initialize:
function
(a, b)
{
this.set("name",
a);
this.set("class",
b);
}
});
var
mymodel = new
student('john',
12);
mymodel.unset('name');
document.write("
");
");
document.write("After
unset, student name is:",
mymodel.get('name'));
</script>
</head>
</html>
After unset, student name is:undefined
clear : Removes all attributes of a model.
Syntax:model.clear([options])
Example
<!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">
student
= Backbone.Model.extend({
defaults:
{
name:
"",
class:
""
},
initialize:
function
(a, b)
{
this.set("name",
a);
this.set("class",
b);
}
});
var
mymodel = new
student('john',
12);
mymodel.clear();
document.write("
");
");
document.write("After
unset, student name is:",
mymodel.get('name'));
</script>
</head>
</html>
Output :
After unset, student name is:undefined
id : The id is an arbitrary string (integer id or UUID),It uniquely identifies the model entity.set when model is created.
Syntax:model.id
ExampleSyntax:model.id
<!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">
student
= Backbone.Model.extend({
defaults:
{
id:
10
}
});
var
mymodel = new
student();
document.write("
");
");
document.write("After
unset, student id is:",
mymodel.get('id'));
</script>
</head>
</html>
Output :
IdAttribute :It gives you model's unique identifier that contains the name of the member of the class, that is use as id.
Example
<!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">
student
= Backbone.Model.extend({
defaults:
{
idAttribute:
'id',
name
:'',
age
:''
}
});
var
mymodel = new
student({id:10,name:'john',age:'12'});
document.write("
");
");
document.write("Unique
indentifier name is :",
mymodel.idAttribute+'');
document.write("Unique
indentifier value is :",
mymodel.get(mymodel.idAttribute));
</script>
</head>
</html>
Output :
Unique indentifier name is :id
Unique indentifier value is :10
Unique indentifier value is :10
Cid : Cid specifies the client id which is automatically generated by Backbone.js. The Backbone.js Cid model can be uniquely identified on the client.
Example
<!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">
student
= Backbone.Model.extend({
defaults:
{
idAttribute:
'id',
name
:'',
age
:''
}
});
var
mymodel = new
student({ id: 10, name: 'john',
age: '12'
});
document.write("Unique
indentifier name is :",
mymodel.cid+'');
var
mymodel1 = new
student({ id: 11, name: 'john2',
age: '15'
});
document.write("Unique
indentifier name is :",
mymodel1.cid + '');
</script>
</head>
</html>
Output :
Unique indentifier name is :c1
Unique indentifier value is :c2
Unique indentifier value is :c2
