The Backbone.JS Has() model is used to get a true value, if the attribute value is defined with a non-null value or non-undefined value.
Syntax:
Model.has(attribute)
Parameters:
attribute: This parameter is used to define properties of a model.
Example:
<title>Example</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">
var X = Backbone.Model.extend();
var Y=new X();
Y.set({MSG1: "HELLO", MSG2: "WORLD"});
if(Y.has('MSG2'))
{
document.write("We have one more message: True");
}
else
{
document.write("We have one more message: False");
}
</script>We have one more message: True
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<title>Example</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">
var X = Backbone.Model.extend();
var Y=new X();
Y.set({MSG1: "HELLO", MSG2: "WORLD"});
if(Y.has('MSG2'))
{
document.write("We have one more message: True");
}
else
{
document.write("We have one more message: False");
}
</script>We have one more message: True
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Example We have one more message: True
Output:
We have one more message: True
We have one more message: True
We have one more message: True
Explanation:
In this example the Backbone.JS has() model is giving a true value if MSG2 is present in Y.