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An Aurelia plugin for the treacherous validation system
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Treacherous plugin for aurelia which allows treacherous validation to hook into the view.

It is very much like the knockout one but tries to work similarly to aurelia's new validation system wherever possible.

(See more about Treacherous HERE)



Just do an jspm install npm:treacherous-aurelia

How do I use it

Once you have installed it you should have access to the treacherous-aurelia module, and the treacherous module (which is a dependency of treacherous-aurelia. You should use treacherous as normal to make your groups and rulesets etc, like:

import {createGroup, createRuleset} from "treacherous";

var model = ...;
var ruleset = createRuleset();
var validationGroup = createGroup(model, ruleset);

The aurelia plugin here is purely just for letting aurelia know about the treacherous system so for aurelia to be aware of your validation groups etc you need to add the plugin to aurelia in your setup, like so:

export function configure(aurelia) {
        .plugin('treacherous-aurelia'); // THIS MAGIC HERE

Then you need to specify what you want to validate:

<input value.bind="someValue & validate"/>

or if you want to manually specify what you want to validate

<input value.bind="someValue" validate-property="someValue"/>

or if you need to do anything complex go for:

<input value.bind="someValue" validate-property.bind="'someArray[' + $index + ']'"/>

Here is an example of what it does and how to use it, feel free to look at the source in the examples folder. View Example

Available Attributes/Elements/Binding Behaviours

This adds a few custom attributes/elements for you to consume to allow your validationGroup instances to be used within the view.

validate binding behaviour

This will attempt to automatically resolve the property you wish to bind to and will use the default registered validation strategy to process it. If it is something complex, like nested properties or arrays you may need to use one of the complex binding attributes.


<input value.bind="someValue & validate"/>

validation-group Attribute

This binding is very much like a with binding, where it provides the validation group to the child bindingContext scopes.

Basic Usage

<section validation-group.bind="someValidationGroup">...</section>

validate-property Attribute

This binding is for manually showing property errors, you can put this anywhere and it will automatically populate the errors for that property into the element you are using.

Basic Usage

<div validate-property="someProperty"></div>

Remember you want to pass the string literal for the property, you can bind complex logic if you are within a complex scenario like a repeat etc.

validation-summary Element

This binding populates the element with a validation summary showing all current errors for the model.

Basic Usage

<!-- Assuming a validationGroup is in scope -->

Advanced Usage

<validation-summary validation-group.bind="someValidationGroup"></validation-summary>

You can use this element anywhere on the page regardless of if it is within the scope of a validation-group container, this way if you have multiple validators on the page you can have them all be output in one place.


By default there is no styling, as its up to you really how you want to style your inline/summary errors, there are some classes which are appended by default which should target in your css:

  • .valid : When a the property associated is valid (you would probably do input.valid in most cases)
  • .invalid : When the property associated is invalid (you would probably do input.invalid in most cases)
  • .validation-error-container : The element containing an inline error for a property
  • .validation-summary-container : The element containing the validation summary elements

These classes are defined within the default InlineValidator as well, ValidationSummaryElement, so if you use your own implementations here you can define any classes you want.


Custom Strategy

Out of the box there is an inline strategy which can be replaced quite easily by replacing the current strategy in the DI container, like so:

import {ValidationStrategy} from "treacherous-aurelia";
import {YourStrategy} from "wherever";

aurelia.container.registerInstance(ValidationStrategy, new YourStrategy());

Webpack Users!

So if you are using webpack bundler for Aurelia you need to make sure in your webpack config file that where you have the new AureliaWebpackPlugin() call you add this in as a sub module like so:

new AureliaWebpackPlugin({
    nameExternalModules: false

And your package.json like this:

"aurelia": {
    "build": {
        "resources": [

This will solve any of the globalResources calls which fail to resolve, same is needed for any other aurelia plugins you want to consume in your webpack project.


So currently this is a bare bones implementation as the knockout version does a lot more for you, such as automatic validation hooking on value and textInput bindings. So going forward there should be some way to achieve the same thing within Aurelia but it is often difficult to get targetted information from the Aurelia team while they are moving towards a major RC.

  • There has been a minor update to allow for basic auto binding via the validate binding behaviour
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