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@lion/validate
Advanced tools
🛠 Status: Pilot Phase
Lion Web Components are still in an early alpha stage; they should not be considered production ready yet.
The goal of our pilot phase is to gather feedback from a private group of users. Therefore, during this phase, we kindly ask you to:
- not publicly promote or link us yet: (no tweets, blog posts or other forms of communication about Lion Web Components)
- not publicly promote or link products derived from/based on Lion Web Components
As soon as Pilot Phase ends we will let you know (feel free to subscribe to this issue https://github.com/ing-bank/lion/issues/1)
Validation is applied by default to all form controls via the ValidateMixin.
For a detailed description of the validation system and the ValidateMixin
, please see ValidationSystem.
npm i --save @lion/validate
import '@lion/input/lion-input.js';
import { %ValidatorName% } from '@lion/validate';
Note that we import an lion-input here as an example of a form control implementing ValidateMixin. We could equally well use lion-textarea, lion-select, lion-fieldset etc. to illustrate our example.
All validators are provided as pure functions. They should be applied to the formcontrol (implementing
ValidateMixin
) as follows:
import '@lion/input/lion-input.js';
import { Required, IsString, MaxLength, DefaultSuccess, Validator } from '@lion/validate';
const isInitialsRegex = /^([A-Z]\.)+$/;
class IsInitialsExample extends Validator {
constructor(...args) {
super(...args);
this.name = 'IsExampleInitials';
}
execute(value) {
let hasError = false;
if (!IsString || !isInitialsRegex.test(value.toLowerCase())) {
hasError = true;
}
return hasError;
}
static getMessage({ fieldName }) {
return `Please enter a valid {fieldName} in the format "A.B.C.".`;
}
}
<lion-input
label="Initials"
name="initials"
.validators="${[new Required(), new MaxLength(10), new IsInitialsExample(null, { type: 'warning' }), new DefaultSuccess()]}"
></lion-input>
In the example above we use different types of validators.
A validator applied to .validators
expects an array with a function, a parameters object and
optionally an additional configuration object.
MinMaxLength({ min: 5, max: 10 });
The custom IsInitialsExample
checks if the value is fitting our regex, but does not prevent the user from submitting other values.
Retrieving validity states is as easy as checking for:
myInitialsInput.hasFeedbackFor.include('error');
FAQs
Validate your form elements
The npm package @lion/validate receives a total of 7 weekly downloads. As such, @lion/validate popularity was classified as not popular.
We found that @lion/validate demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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