vue-model-date

This is a helper directive, that provides functionality similar to v-model for handling binding between

• date model properties and
• html input elements of type date or string

Installation

$ npm install --save-dev vue-model-date

Usage

Import the directive into each component as required, or register globally. The date-fns library is used for formatting and parsing. If model property being bound to also contains a time portion, this will remain intact

Most default behaviour can be over-ridden by providing hook function as options when binding

Directive Options

Binding options recognized by the directive

Name	Type	Required	Description
value	String | Date	Y	identifies the model property to bind to
pattern	String	N	used for parsing and formatting. defaults to 'YYYY-MM-DD' see [link]
adjustDate	Function(Date,Date) : Date | Null	N	if the date portion of provided args is different, then return (arg2) +/- days if the date portion of provided args is the same, then return null
equal	Function(Date,Date) : Boolean	N	perform an equality check on the date portion of the provided args
parse	Function(String,String) : Date	N	parse the provided string (arg1) using the specified pattern (arg2)
format	Function(Date,String) : String	N	format the provided date (arg1) using the specified pattern (arg2)

Examples

These assume you have registered the directive similar to below

import { Vue } from 'vue';
import { VueModelDate } from 'vue-model-date';

new Vue({
    template: ...,
    directives: {
        'model-date': VueModelDate
    },
    data: () => { return { myDate: date } }
})

Usage

If the browser has native support for date input controls, then usage is straight forward. The directive will ignore any custom formatting in this scenario, as the default is sufficient.

simple

binds to a model property. This assumes the browser has native support for date input controls.

<input type="date" v-model-date="myDate"/>

data: function() {
    return { myDate: new Date() };
}

binding to an object literal for options

binds to the object literal provided. Below specifies an optional formatting pattern, to be used if the browser does not have native support for date control

<input type="date" v-model-date="{ value: myDate, pattern: 'MM-DD-YYYY' }"/>

data: function() {
    return { myDate: new Date() };
}

bind to model property for options

binds to a model property. When using this syntax, you must supply a string for the value property)

<input type="date" v-model-date="opts"/>

data: function() {
    return {
        myObject: {
            myDate: new Date()
        },
        opts : {
            value: 'myObject.myDate' // binding expression to identify the model property,
            pattern: 'MM-DD-YYYY' // custom parse/format pattern
        }
    };
}

no native support

If the browser does not have native support for date input, it will degrade to a text input. In this scenario, a property 'hasNativeSupport' will be added to the dataset of HTML element.

You should then further restrict user input by conditionally adding 'pattern' to the element as shown below

<input type="text" v-model-date="opts" :pattern="($el.dataset.hasNativeSupport ? false : opts.validator)" />

data: function() {
    return {
        myDate: new Date(),
        opts : {
            value: 'myDate', // binding expression to identify the model property,
            pattern: 'MM-DD-YYYY', // custom parse/format pattern
            validator: '[0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]' // the custom regex string to be used for fallback scenario
        }
    };
}

custom hooks

the example below supplies a custom function hook for equality checking (performed after UI changes occur). when you provide a hook, the context of this object will be the directive instance

<input type="date" v-model-date="opts"/>

data: function(){
    return {
        myDate: new Date(),
        opts : {
            value: 'myDate' // note use of string as binding expression,
            equal: (oldValue,newValue) => {
                // ... customize how the equality comparison is done
                return true;
            }
        }
    };
}

Authors

• mrellipse

Contributing

There are no plans to alter/change this code (besides any bug fixes)

License

This project is licensed under the MIT License - see the LICENSE file for details

Acknowledgments

• vuejs.org
• date-fns.org