JavaScript How to set a default value for a property of an Polymer object, on the basis of other properties default value property access,default value property c#,default value

I want set property's value for Polymer object from function, which depended from other properties, if default value not set

Polymer({
    is: "my-element",
    properties : {
        a: String,
        b: String,
        c: {
            type: String,
            value: function() {return " " + this.a + " " + this.b}
        }
    },
    calcC: function() {return " " + this.a + " " + this.b}
});

How can i realize it?

<dom-module id="my-element">
    <template>
        <p>a: {{a}}</p>
        <p>b: {{b}}</p>
        <p>c: {{c}}</p>
        <p>calc c: {{calcC()}}</p>
    </template>
</dom-module>

<my-element a="a" b="b"></my-element>

render

a: a

b: b

c: undefined undefined

calc c: undefined undefined

jsfiddle

Answer:1

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