js-binding

Simplified json generation

Install

npm install json-binding --save

Usage

This library allows to create json template and bind with your model, for example:

This is json template.

{
    '{{type}}Id': '{{id}}',
    list: [
        { 
            $repeat: 'item in items', 
            $if: 'item.confirm', 
            amount: {{item.amount}} 
        }
    ]
}

This is model.

{
    id: 1,
    type: 'order',
    items: [
        { amount: 4, confirm: true },
        { amount: 9, confirm: false },
    ]
}

And you can bind template and model together by:

let jsonBinder = new JsonBinder();
let result = jsonBinder.bind(template, model);

And the result will be:

{
    orderId: 1,
    list: [
        { amount: 4 }
    ]
}

Directives

$bind

$bind is to output from your model.

result = jsonBinder.bind(
    { test: { $bind: 'foo' } }, 
    { foo: ['bar'] }
);
expect(result).deep.equals({ test: ['bar'] });

$content

$content is to return object inside this directive.

result = jsonBinder.bind(
    { test: { $content: ['bar'] } }, 
    { }
);
expect(result).deep.equals({ test: ['bar'] });

$if

$if is to conditionally add or not add object.

result = jsonBinder.bind({
    foo: { $if: 'x == 1', fooKey: 'fooValue' },
    bar: { $if: 'x == 2', barKey: 'barValue' },
}, { x: 1 });
expect(result).deep.equals({ foo: { fooKey: 'fooValue' } });

You can use $if in conjuction with $content and $else.

result = jsonBinder.bind(
    { test: { $if: 'x == 2', $content: 'yes', $else: 'no' } }, 
    { x: 1 }
);
expect(result).deep.equals({ test: 'no' });

$init

$init is to run command when binding.

result = jsonBinder.bind({ $init: 'x = 2', $content: '{{x}}' }, { x: 1 });
expect(result).equals('2');

$repeat

$repeat is to loop your model and bind to template.

result = jsonBinder.bind(
    { list: [ { $repeat: 'item in items', $if: 'item != "c"', value: '{{item}}' } ] }, 
    { items: [ 'a', 'b', 'c' ]}
);
expect(result).deep.equals({ 
    list: [
        { value: 'a' },
        { value: 'b' },
    ]
});

You can loop through object.

result = jsonBinder.bind(
    { 
        $repeat: '(key, value) in obj', 
        $content: '{{key}}={{value}}' 
    }, 
    { obj: { a: 'b', c: 'd' } }
);
expect(result).deep.equals(['a=b', 'c=d']);

In $repeat, you can access to index by $index, and access to parent scope by $parent.

$template

You can add template by registerTemplate and bind model to template by $template.

jsonBinder.registerTemplate('baz', { foo: 'baz' });

result = jsonBinder.bind({ $template: 'template' }, { template: 'baz' });
expect(result).deep.equals({ foo: 'baz' });

Custom Directives

You can add custom directives by registerDirective. Please see example in unit test.

Promise

If one of operation is Promise, bind method will return Promise. Otherwise JsonBinder will return non-promise value.

Plug to AngularJS

This library can be used in NodeJS or on browser without AngularJS. If you would like to register JsonBinder to AngularJS and using AngularJS filters, you can do following.

angular.module('yourModule')
    .service('jsonBinder', JsonBinder);

Now you can use AngularJS filters.

{
    totalValue: '{{ vm.sumTotal() | number:2 }}'
}