form-elements
v2.3.3
Published
Form elements for HTML-element based systems
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form-elements
A collection of form elements.
Usage
const els = require('form-elements')
const html = require('nanohtml')
const scratch = {
test: '',
test2: '',
pushed: 0
}
const errOpts = {
classes: ['error-note'],
animate: true,
hiddenState: {
height: function () {
let height = this.$errorContainer.clientHeight
if (this.$errorContainer.children.length === 0) {
height = '0'
}
return `${height}px`
},
overflow: 'hidden',
transition: 'height 0.8s'
},
visibleState: {
height: function () {
let height = this.$errorContainer.clientHeight
if (this.$errorContainer.children.length === 0) {
height = '0'
}
return `${height}px`
}
}
}
function main (state, emit) {
const formErrors = els.error(errOpts)
const inputOpts = {
classes: [],
validate: true,
errorDisplay: formErrors
}
const input2Opts = {
classes: [],
required: true,
validate: true,
errorDisplay: formErrors
}
const $input = els.labeledInput('test email', 'email', oninput, scratch.test, inputOpts)
const $input2 = els.labeledInput('test required', 'text', oninput2, scratch.test2, input2Opts)
return html`<div class="">
<div class="">
${formErrors.render()}<br>
<b>Button pushed:</b> ${scratch.pushed}<br>
<b>Input value:</b> ${scratch.test}<br>
${$input}<br>
${$input2}<br>
${els.button('i am a button', (evt) => ++scratch.pushed && emit('render'))}
</div>
</div>`
function oninput (evt) {
scratch.test = evt.currentTarget.value
}
function oninput2 (evt) {
scratch.test2 = evt.currentTarget.value
}
}
Results in:
<form>
<div></div>
<label>Email<br><input type="email" value=""></label>
<button>submit!</button>
</form>
In this example, the <input type='email'>
field will be validated using the
built-in browser's validation framework for email addresses. When the user
blur
s from the field, it'll attempt to validate the data inside, and if
it isn't valid, it'll display the error in the <div>
located at the top
of the form.
Options
elementOptions:object(key:string,value:any)
All the elements accept an elementOptions
hash as the final argument which controls any additional element attributes you may wish to set, in addition to the following:
classes:array(string)
- an array of class names to apply, in addition to the default ones.style:string
- a string containing inline style information
If you wish to override all the classes attached to the input, you can do so by providing the class
key on this options list.
Event handlers should be provided using the on[event]
key, e.g. oninput
or onblur
.
Each element type will have specific attributes that can be set in addition to the default attributes provided by the DOM spec.
errorOptions:object(key:string,value:any)
This is a superset of elementOptions
containing the following extra values:
animate:boolean
: whether or not it should attach style information for CSS animations to show/hide the error elementvisibleState:object(key:string,value:string|function)
: what styles to apply to the object when it's visiblehiddenState:object(key:string,value:string|function)
: what styles to apply to the object when it's visible
The valid keys for visibleState
and hiddenState
are all valid HTML Style rules. You can either set them to a string or a function which returns a sting and runs in the context of the Error element.
{
animate: true,
hiddenState: {
opacity: 0,
transition: 'opacity 0.8s ease-in'
},
visibleState: {
opacity: 1,
height: function () {
const height = this.$el.clientHeight + 15
return `${height}px`
}
}
}
The initial state of the object is hiddenState
-- these rules will supercede any styles or classes on the object. When errors are presented to the user, it will apply the styles found in visibleState
. These will be applyed everytime a new error is presented, allowing you to grow/shrink or otherwise alter the box. When all of the errors are gone, it will apply
the hiddenState
styles again.
API
error(opts:errorOptions):ErrorDisplay
Create a new error display object
ErrorDisplay
:
#render():HTMLDivElement
- return a<div>
element, using theopts
provided by the constructor#displayError(key:string, text:string):undefined
- Add a new error to the display#removeError(key:string):undefined
- Remove an error from the display#clear():undefined
- Remove all errors
Elements
input(label:string, type:string, inputHandler:function(evt:HTMLInputEvent, value:(string|number), opts:elementOptions):HTMLInputElement
Create a form input with various options. opts
accepts any of the HTMLInputElement attributes, the usual default attributes, in addition to several custom fields:
validate:boolean
- should validation be attempted when theblur
event has been firedvalidator:function($el:HTMLInputElement):boolean
- a custom validation method that returns true/false. If you need to set a custom error message, you should use$el.setCustomValidity
, but don't forget to set to an empty string when the error has been resolved!errorDisplay:ErrorElement
- the error element that validation errors should be placed into. Must match the API provided by the includederror
object
<input type=[type] value=[value] oninput=[inputHandler]>
button(text:string, clickHandler:function(evt:HTMLClickEvent), opts:elementOptions):HTMLButtonElement
Create a button with a click handler.
<button onclick=[clickHandler]>[text]</button>
label(text:string, opts:elementOptions):HTMLLabellement
Create a label
<label>[text]</label>
labeledInput(label:string, type:string, inputHandler:function(evt:HTMLInputEvent, value:(string|number), labelOpts:elementOptions, inputOpts:elementOptions)
Create a form input element wrapped by a label
<label>[text]<br><input type=[type] value=[value] oninput=[inputHandler]></label>
License
Copyright © 2018 Scripto, LLC. Licensed under Apache-2.0