nk20/note_kfet/static/js/dynamic-formset.js

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/**
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* jQuery Formset 1.5-pre
* @author Stanislaus Madueke (stan DOT madueke AT gmail DOT com)
* @requires jQuery 1.2.6 or later
*
* Copyright (c) 2009, Stanislaus Madueke
* All rights reserved.
*
* Licensed under the New BSD License
* See: http://www.opensource.org/licenses/bsd-license.php
*/
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;(function ($) {
$.fn.formset = function (opts) {
var options = $.extend({}, $.fn.formset.defaults, opts)
var flatExtraClasses = options.extraClasses.join(' ')
var totalForms = $('#id_' + options.prefix + '-TOTAL_FORMS')
var maxForms = $('#id_' + options.prefix + '-MAX_NUM_FORMS')
var minForms = $('#id_' + options.prefix + '-MIN_NUM_FORMS')
var childElementSelector = 'input,select,textarea,label,div'
var $$ = $(this)
var applyExtraClasses = function (row, ndx) {
if (options.extraClasses) {
row.removeClass(flatExtraClasses)
row.addClass(options.extraClasses[ndx % options.extraClasses.length])
}
}
var updateElementIndex = function (elem, prefix, ndx) {
var idRegex = new RegExp(prefix + '-(\\d+|__prefix__)-')
var replacement = prefix + '-' + ndx + '-'
if (elem.attr('for')) elem.attr('for', elem.attr('for').replace(idRegex, replacement))
if (elem.attr('id')) elem.attr('id', elem.attr('id').replace(idRegex, replacement))
if (elem.attr('name')) elem.attr('name', elem.attr('name').replace(idRegex, replacement))
}
var hasChildElements = function (row) {
return row.find(childElementSelector).length > 0
}
var showAddButton = function () {
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return maxForms.length === 0 || // For Django versions pre 1.2
(maxForms.val() === '' || (maxForms.val() - totalForms.val() > 0))
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}
/**
* Indicates whether delete link(s) can be displayed - when total forms > min forms
*/
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var showDeleteLinks = function () {
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return minForms.length === 0 || // For Django versions pre 1.7
(minForms.val() === '' || (totalForms.val() - minForms.val() > 0))
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}
var insertDeleteLink = function (row) {
var delCssSelector = $.trim(options.deleteCssClass).replace(/\s+/g, '.')
var addCssSelector = $.trim(options.addCssClass).replace(/\s+/g, '.')
var delButtonHTML = '<a class="' + options.deleteCssClass + '" href="javascript:void(0)">' + options.deleteText + '</a>'
if (options.deleteContainerClass) {
// If we have a specific container for the remove button,
// place it as the last child of that container:
row.find('[class*="' + options.deleteContainerClass + '"]').append(delButtonHTML)
} else if (row.is('TR')) {
// If the forms are laid out in table rows, insert
// the remove button into the last table cell:
row.children('td:last').append(delButtonHTML)
} else if (row.is('UL') || row.is('OL')) {
// If they're laid out as an ordered/unordered list,
// insert an <li> after the last list item:
row.append('<li>' + delButtonHTML + '</li>')
} else {
// Otherwise, just insert the remove button as the
// last child element of the form's container:
row.append(delButtonHTML)
}
// Check if we're under the minimum number of forms - not to display delete link at rendering
if (!showDeleteLinks()) {
row.find('a.' + delCssSelector).hide()
}
row.find('a.' + delCssSelector).click(function () {
var row = $(this).parents('.' + options.formCssClass)
var del = row.find('input:hidden[id $= "-DELETE"]')
var buttonRow = row.siblings('a.' + addCssSelector + ', .' + options.formCssClass + '-add')
var forms
if (del.length) {
// We're dealing with an inline formset.
// Rather than remove this form from the DOM, we'll mark it as deleted
// and hide it, then let Django handle the deleting:
del.val('on')
row.hide()
forms = $('.' + options.formCssClass).not(':hidden')
} else {
row.remove()
// Update the TOTAL_FORMS count:
forms = $('.' + options.formCssClass).not('.formset-custom-template')
totalForms.val(forms.length)
}
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for (var i = 0, formCount = forms.length; i < formCount; i++) {
// Apply `extraClasses` to form rows so they're nicely alternating:
applyExtraClasses(forms.eq(i), i)
if (!del.length) {
// Also update names and IDs for all child controls (if this isn't
// a delete-able inline formset) so they remain in sequence:
forms.eq(i).find(childElementSelector).each(function () {
updateElementIndex($(this), options.prefix, i)
})
}
}
// Check if we've reached the minimum number of forms - hide all delete link(s)
if (!showDeleteLinks()) {
$('a.' + delCssSelector).each(function () { $(this).hide() })
}
// Check if we need to show the add button:
if (buttonRow.is(':hidden') && showAddButton()) buttonRow.show()
// If a post-delete callback was provided, call it with the deleted form:
if (options.removed) options.removed(row)
return false
})
}
$$.each(function (i) {
var row = $(this)
var del = row.find('input:checkbox[id $= "-DELETE"]')
if (del.length) {
// If you specify "can_delete = True" when creating an inline formset,
// Django adds a checkbox to each form in the formset.
// Replace the default checkbox with a hidden field:
if (del.is(':checked')) {
// If an inline formset containing deleted forms fails validation, make sure
// we keep the forms hidden (thanks for the bug report and suggested fix Mike)
del.before('<input type="hidden" name="' + del.attr('name') + '" id="' + del.attr('id') + '" value="on" />')
row.hide()
} else {
del.before('<input type="hidden" name="' + del.attr('name') + '" id="' + del.attr('id') + '" />')
}
// Hide any labels associated with the DELETE checkbox:
$('label[for="' + del.attr('id') + '"]').hide()
del.remove()
}
if (hasChildElements(row)) {
row.addClass(options.formCssClass)
if (row.is(':visible')) {
insertDeleteLink(row)
applyExtraClasses(row, i)
}
}
})
if ($$.length) {
var hideAddButton = !showAddButton()
var addButton; var template
if (options.formTemplate) {
// If a form template was specified, we'll clone it to generate new form instances:
template = (options.formTemplate instanceof $) ? options.formTemplate : $(options.formTemplate)
template.removeAttr('id').addClass(options.formCssClass + ' formset-custom-template')
template.find(childElementSelector).each(function () {
updateElementIndex($(this), options.prefix, '__prefix__')
})
insertDeleteLink(template)
} else {
// Otherwise, use the last form in the formset; this works much better if you've got
// extra (>= 1) forms (thnaks to justhamade for pointing this out):
if (options.hideLastAddForm) $('.' + options.formCssClass + ':last').hide()
template = $('.' + options.formCssClass + ':last').clone(true).removeAttr('id')
template.find('input:hidden[id $= "-DELETE"]').remove()
// Clear all cloned fields, except those the user wants to keep (thanks to brunogola for the suggestion):
template.find(childElementSelector).not(options.keepFieldValues).each(function () {
var elem = $(this)
// If this is a checkbox or radiobutton, uncheck it.
// This fixes Issue 1, reported by Wilson.Andrew.J:
if (elem.is('input:checkbox') || elem.is('input:radio')) {
elem.attr('checked', false)
} else {
elem.val('')
}
})
}
// FIXME: Perhaps using $.data would be a better idea?
options.formTemplate = template
var addButtonHTML = '<a class="' + options.addCssClass + '" href="javascript:void(0)">' + options.addText + '</a>'
if (options.addContainerClass) {
// If we have a specific container for the "add" button,
// place it as the last child of that container:
var addContainer = $('[class*="' + options.addContainerClass + '"')
addContainer.append(addButtonHTML)
addButton = addContainer.find('[class="' + options.addCssClass + '"]')
} else if ($$.is('TR')) {
// If forms are laid out as table rows, insert the
// "add" button in a new table row:
var numCols = $$.eq(0).children().length // This is a bit of an assumption :|
var buttonRow = $('<tr><td colspan="' + numCols + '">' + addButtonHTML + '</tr>').addClass(options.formCssClass + '-add')
$$.parent().append(buttonRow)
addButton = buttonRow.find('a')
} else {
// Otherwise, insert it immediately after the last form:
$$.filter(':last').after(addButtonHTML)
addButton = $$.filter(':last').next()
}
if (hideAddButton) addButton.hide()
addButton.click(function () {
var formCount = parseInt(totalForms.val())
var row = options.formTemplate.clone(true).removeClass('formset-custom-template')
var buttonRow = $($(this).parents('tr.' + options.formCssClass + '-add').get(0) || this)
var delCssSelector = $.trim(options.deleteCssClass).replace(/\s+/g, '.')
applyExtraClasses(row, formCount)
row.insertBefore(buttonRow).show()
row.find(childElementSelector).each(function () {
updateElementIndex($(this), options.prefix, formCount)
})
totalForms.val(formCount + 1)
// Check if we're above the minimum allowed number of forms -> show all delete link(s)
if (showDeleteLinks()) {
$('a.' + delCssSelector).each(function () { $(this).show() })
}
// Check if we've exceeded the maximum allowed number of forms:
if (!showAddButton()) buttonRow.hide()
// If a post-add callback was supplied, call it with the added form:
if (options.added) options.added(row)
return false
})
}
return $$
}
/* Setup plugin defaults */
$.fn.formset.defaults = {
prefix: 'form', // The form prefix for your django formset
formTemplate: null, // The jQuery selection cloned to generate new form instances
addText: 'add another', // Text for the add link
deleteText: 'remove', // Text for the delete link
addContainerClass: null, // Container CSS class for the add link
deleteContainerClass: null, // Container CSS class for the delete link
addCssClass: 'add-row', // CSS class applied to the add link
deleteCssClass: 'delete-row', // CSS class applied to the delete link
formCssClass: 'dynamic-form', // CSS class applied to each form in a formset
extraClasses: [], // Additional CSS classes, which will be applied to each form in turn
keepFieldValues: '', // jQuery selector for fields whose values should be kept when the form is cloned
added: null, // Function called each time a new form is added
removed: null, // Function called each time a form is deleted
hideLastAddForm: false // When set to true, hide last empty add form (becomes visible when clicking on add button)
}
})(jQuery)