svelte-html5-validators
v1.0.0
Published
Simple library that adds validator attributes --required, min, maxlength...-- to form elements using Svelte.
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Svelte HTML5 Validators
Simple library that adds validator attributes --required, min, maxlength...-- to form elements using Svelte. By directly adding these attributes to the form elements, the native HTML5 validation controls can be used. That includes the pseudo-classed valid
and invalid
to style form elements according to its validity status.
Install
npm i svelte-html5-validators
oryarn add svelte-html5-validators
How to use
<script>
import { buildForm } from "svelte-html5-validators";
const { form, applyValidators } = buildForm({
"name": ["required", "pattern:^[A-Z][a-zA-Z\\s]*$"],
}, { initialValidation: true, validateOnChange: true });
let formData = {
name: "world"
};
</script>
<style type="text/scss">
input {
&:invalid {
border: 2px dashed red;
}
&:valid {
border: 2px solid black;
}
}
</style>
<form use:applyValidators>
<input
type="text"
name="name"
bind:value={formData.name} />
</form>
API
buildForm(validators: FieldValidators, config: Config = {}): { form: Form; applyValidators: SvelteAction }
Returns a Form object and the applyValidators
action, which uses the validators given as the first parameters.
As second parameter you can pass a configuration object. The possible options are as follow:
| Property | Description | Default | |----------|-------------|------| | initialValidation | Set to true if you want to perform an initial validation check | true | | validateOnChange | Set to true if you want to perform a validation check after every input | true |
applyValidators: SvelteAction
A Svelte action to use on the form HTML element. Finds all the form elements (input, textarea, select) and adds the validators given to buildForm
.
It is necessary to give to all the form elements, or at least to the ones where you want to apply validators, an id
or name
attribute. In either case, there exists a form element and a validator for it is not provided or a validator is defined for a not added form element, applyValidators
will not error out.
Field Validators Object
Object to be provided to the buildForm
function. The properties for this object are the form elements id
or name
attributes, and the assigned value to each property is a string array with the validators.
The validators that require a value (e.g.: min) are on the form min:6
.
{ "name": ["required", "minlength:6"], "age": ["min:0", "max:99"] }
<input type="text" name="name" />
<input type="number" name="age" />
Form Object
Svelte store returned by the buildForm
function. This store provides the object value, the getControl
function, and the validate
function.
Value
{ entries: { name: string; value: any; valid: boolean; }[]; valid: boolean }
entries
is an array of objects. Each entry has name
, the control name of the form element; value, the value of the form element; and valid, the validity of the form element.valid
indicates the entire form validity.
getControl: (formControlName: string) => { name: string; value: any; valid: boolean }
Returns the entry of the given formControlName
of the form object.
validate: () => void
Checks the validity of the form and updates the form object with the current form data.
clear: () => void
Clears the form object --undefines the values from each entry-- and invalidates each entry and the form. If you want to check if the form object is valid after clearing it, you will need to execute validate
.
Validators
required
{ "control": ["required"] }
Adds the attribute required
to the form element with id
or name
control.
Valid when it has some value.
disabled
{ "control": ["disabled"] }
Adds the attribute disabled
to the form element with id
or name
control.
Blocks editing of the form element.
pattern
{ "control": ["pattern:^[A-Z][a-zA-Z\\s]*$"] }
Adds the attribute pattern
with the pattern given after the : to the form element with id
or name
control.
Valid when the value matches the pattern.
min
{ "control": ["min:3"] }
Adds the attribute min
with the given argument to the form element with id
or name
control.
Valid for inputs of type range
, number
, date
, month
, week
, datetime
, datetime-local
, and time
when the value is higher than the given argument.
max
{ "control": ["max:30"] }
Adds the attribute max
with the given argument to the form element with id
or name
control.
Valid for inputs of type range
, number
, date
, month
, week
, datetime
, datetime-local
, and time
when the value is lower than the given argument.
minlength
{ "control": ["minlength:3"] }
Adds the attribute minlength
with the given argument to the form element with id
or name
control.
Valid for inputs of type text
, search
, url
, tel
, email
, password
, and also on textareas when the number of characters is larger than the given argument.
maxlength
{ "control": ["maxlength:30"] }
Adds the attribute maxlength
with the given argument to the form element with id
or name
control.
Valid for inputs of type text
, search
, url
, tel
, email
, password
, and also on textareas when the number of characters is smaller than the given argument.
datetime
{ "control": ["datetime"] }
Sets the input's attribute type
with id
or name
control to datetime-local
.
Valid when the value is a datetime.
datetime-local
{ "control": ["datetime-local"] }
Sets the input's attribute type
with id
or name
control to datetime-local
.
Valid when the value is a datetime.
date
{ "control": ["date"] }
Sets the input's attribute type
with id
or name
control to date
.
Valid when the value is a date.
time
{ "control": ["time"] }
Sets the input's attribute type
with id
or name
control to time
.
Valid when the value is a time.
month
{ "control": ["month"] }
Sets the input's attribute type
with id
or name
control to month
.
Valid when the value is a month.
week
{ "control": ["week"] }
Sets the input's attribute type
with id
or name
control to week
.
Valid when the value is a week.
{ "control": ["email"] }
Sets the input's attribute type
with id
or name
control to email
.
Valid when the value is an e-mail address.
tel
{ "control": ["tel"] }
Sets the input's attribute type
with id
or name
control to tel
.
Valid when the value is a telephone number.
url
{ "control": ["url"] }
Sets the input's attribute type
with id
or name
control to url
.
Valid when the value is an URL.
password
{ "control": ["password"] }
Sets the input's attribute type
with id
or name
control to password
.
Hides the value of the form element.