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/*
jQuery placeholder plugin
by Andrey Kuzmin, @unsoundscapes
Based on existing plugin http://mths.be/placeholder by @mathias
and this demo http://robertnyman.com/2011/05/02/ by @robertnyman
Adopted to toggle placeholder on user input instead of focus
Released under the MIT license
*/
(function (factory) {
'use strict';
if (typeof define === 'function' && define.amd) {
// AMD. Register as anonymous module.
define(['jquery'], factory)
} else {
// Browser globals.
factory(jQuery)
}
}(function ($) {
'use strict';
var isInputSupported = 'placeholder' in document.createElement('input')
, isTextareaSupported = 'placeholder' in document.createElement('textarea')
, $placeholders = $()
function getAttributes (element) {
// Return an object of element attributes
var newAttrs = {}
, rinlinejQuery = /^jQuery\d+$/
$.each(element.attributes, function () {
if (this.specified && !rinlinejQuery.test(this.name)) {
newAttrs[this.name] = this.value
}
})
return newAttrs
}
function setCaretTo (element, index) {
// Set caret to specified @index
if (element.createTextRange) {
var range = element.createTextRange()
range.move('character', index)
range.select()
} else if (element.selectionStart !== null) {
element.focus()
element.setSelectionRange(index, index)
}
}
function Placeholder (element, options) {
this.options = options || {}
this.$replacement = this.$element = $(element)
this.initialize.apply(this, arguments)
// Cache all elements with placeholders
$placeholders = $placeholders.add(element)
}
Placeholder.prototype = {
initialize: function () {
this.isHidden = true
this.placeholderAttr = this.$element.attr('placeholder')
// do not mess with default behavior
this.$element.removeAttr('placeholder')
this.isPassword = this.$element.is('[type=password]')
if (this.isPassword) this.makeReplacement()
this.$replacement.on({
'keydown.placeholder': $.proxy(this.hide, this)
, 'focus.placeholder drop.placeholder click.placeholder': $.proxy(this.setCaret, this)
})
this.$element.on({
'blur.placeholder keyup.placeholder': $.proxy(this.show, this)
})
this.show()
}
// Set or get input value
// Setting value toggles placeholder
, val: function (value) {
if (value === undefined) {
return this.isHidden ? this.$element[0].value : '';
}
if (value === '') {
if (this.isHidden) {
this.$element[0].value = value
this.show()
}
} else {
if (!this.isHidden) this.hide()
this.$element[0].value = value
}
return this
}
// Hide placeholder at user input
, hide: function (e) {
var isActiveElement = this.$replacement.is(':focus')
if (this.isHidden) return;
if (!e || !(e.shiftKey && e.keyCode === 16) && e.keyCode !== 9) {
this.isHidden = true
if (this.isPassword) {
this.$replacement.before(this.$element.show()).hide()
if (isActiveElement) this.$element.focus()
} else {
this.$element[0].value = ''
this.$element.removeClass(this.options.className)
}
}
}
// Show placeholder on blur and keyup
, show: function (e) {
var isActiveElement = this.$element.is(':focus')
if (!this.isHidden) return;
if (this.$element[0].value === '') {
this.isHidden = false
if (this.isPassword) {
this.$element.before(this.$replacement.show()).hide()
if (isActiveElement) this.$replacement.focus()
} else {
this.$element[0].value = this.placeholderAttr
this.$element.addClass(this.options.className)
if (isActiveElement) this.setCaret(e)
}
}
}
// Set caret at the beginning of the input
, setCaret: function (e) {
if (e && !this.isHidden) {
setCaretTo(this.$replacement[0], 0)
e.preventDefault()
}
}
// Make and return replacement element
, makeReplacement: function () {
// we can't use $.fn.clone because ie <= 8 doesn't allow type change
var replacementAttributes =
$.extend(
getAttributes(this.$element[0])
, { 'type': 'text'
, 'value': this.placeholderAttr
}
)
// replacement should not have input name
delete replacementAttributes.name
this.$replacement = $('<input>', replacementAttributes)
.data('placeholder', this)
.addClass(this.options.className)
return this.$replacement;
}
}
// Override jQuery val and prop hooks
$.valHooks.input = $.valHooks.textarea = $.propHooks.value = {
get: function (element) {
var placeholder = $(element).data('placeholder')
return placeholder ? placeholder.val() : element.value;
}
, set: function (element, value) {
var placeholder = $(element).data('placeholder')
return placeholder ? placeholder.val(value) : element.value = value;
}
}
// Plugin definition
$.fn.placeholder = function (option) {
return this.each(function () {
var $this = $(this)
, data = $this.data('placeholder')
, options = $.extend({}, $.fn.placeholder.defaults, typeof option === 'object' && option)
if (!data && $this.is('[placeholder]') && (options.force ||
!isInputSupported && $this.is('input') ||
!isTextareaSupported && $this.is('textarea'))) {
$this.data('placeholder', data = new Placeholder(this, options))
}
if (data && typeof option === 'string') data[option]()
})
}
$.fn.placeholder.defaults = {
force: false
, className: 'placeholder'
}
$.fn.placeholder.Constructor = Placeholder
// Events
$(document).on('submit.placeholder', 'form', function () {
// Clear the placeholder values so they don't get submitted
$placeholders.placeholder('hide')
// And then restore them back
setTimeout(function () { $placeholders.placeholder('show') }, 10)
})
$(window).on('beforeunload.placeholder', function () {
// Clear placeholders upon page reload
$placeholders.placeholder('hide')
})
return Placeholder
}));
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