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Polymer Object Attribute With Default Values

Asked By: Anonymous

I want to set up an options object attribute in my custom element that will take default values when not supplied by user.

<!DOCTYPE html>
<html>
<head>
    <a href="http://bower_components/platform/platform.js">http://bower_components/platform/platform.js</a>
    <link rel="import" href="bower_components/polymer/polymer.html">
</head>
<body>
    <my-element options="{{{
                option_1: 'val1',
                option_2: 'val2',
                allow_this: true,
                allow_that: false
            }}}">
    </my-element>
</body>
</html>

<polymer-element name="my-element" attributes="options">
    <template>
        <ul>
            <!-- ... -->
        </ul>
    </template>

    <script>
        Polymer('my-element', {
            options: {
                option_1: 'default_val1',
                option_2: 'default_val2',
                allow_this: false,
                allow_that: false
            }
        });
    </script>

</polymer-element>

The above code doesn’t work as values specified in the element constructor always override those I am trying to pass in. How can I set it up so that option values are set to those passed in and default values are only used as fallback?


Solution

Answered By: Anonymous

You can pass object values into published properties using JSON in attributes, but it must be strictly valid JSON (http://jsonlint.com/).

In this case, try:

<my-element options='{
            "option_1": "val1",
            "option_2": "val2",
            "allow_this": true,
            "allow_that": false
        }'>
</my-element>

Notice the single quotes on the attribute, and the double quotes inside the JSON itself. The double quotes are required by the JSON specifications.

Note that this is not data-binding, and so it does not use mustache notation {{ }}. Instead, you are simply describing a string value in an attribute that Polymer will deserialize (JSON.parse) into an object.

techinplanet staff


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