source: trunk/grails-app/taglib/dbnp/studycapturing/WizardTagLib.groovy @ 216

package dbnp.studycapturing

import org.codehaus.groovy.grails.plugins.web.taglib.JavascriptTagLib
import dbnp.studycapturing.*
import dbnp.data.*

/**
 * Wizard tag library
 *
 * @author Jeroen Wesbeek
 * @since 20100113
 * @package wizard
 *
 * Revision information:
 * $Rev: 216 $
 * $Author: duh $
 * $Date: 2010-02-26 14:23:03 +0000 (vr, 26 feb 2010) $
 */
class WizardTagLib extends JavascriptTagLib {
        // define the tag namespace (e.g.: <wizard:action ... />
        static namespace = "wizard"

        // define the AJAX provider to use
        static ajaxProvider = "jquery"

        // define default text field width
        static defaultTextFieldSize = 25;

        /**
         * ajaxButton tag, this is a modified version of the default
         * grails submitToRemote tag to work with grails webflows.
         * Usage is identical to submitToRemote with the only exception
         * that a 'name' form element attribute is required. E.g.
         * <wizard:ajaxButton name="myAction" value="myButton ... />
         *
         * you can also provide a javascript function to execute after
         * success. This behaviour differs from the default 'after'
         * action which always fires after a button press...
         *
         * @see http://blog.osx.eu/2010/01/18/ajaxifying-a-grails-webflow/
         * @see http://www.grails.org/WebFlow
         * @see http://www.grails.org/Tag+-+submitToRemote
         * @todo perhaps some methods should be moved to a more generic
         *        'webflow' taglib or plugin
         * @param Map attributes
         * @param Closure body
         */
        def ajaxButton = { attrs, body ->
                // get the jQuery version
                def jQueryVersion = grailsApplication.getMetadata()['plugins.jquery']

                // fetch the element name from the attributes
                def elementName = attrs['name'].replaceAll(/ /, "_")

                // javascript function to call after success
                def afterSuccess = attrs['afterSuccess']

                // src parameter?
                def src = attrs['src']
                def alt = attrs['alt']

                // generate a normal submitToRemote button
                def button = submitToRemote(attrs, body)

                /**
                 * as of now (grails 1.2.0 and jQuery 1.3.2.4) the grails webflow does
                 * not properly work with AJAX as the submitToRemote button does not
                 * handle and submit the form properly. In order to support webflows
                 * this method modifies two parts of a 'normal' submitToRemote button:
                 *
                 * 1) replace 'this' with 'this.form' as the 'this' selector in a button
                 *    action refers to the button and / or the action upon that button.
                 *    However, it should point to the form the button is part of as the
                 *    the button should submit the form data.
                 * 2) prepend the button name to the serialized data. The default behaviour
                 *    of submitToRemote is to remove the element name altogether, while
                 *    the grails webflow expects a parameter _eventId_BUTTONNAME to execute
                 *    the appropriate webflow action. Hence, we are going to prepend the
                 *    serialized formdata with an _eventId_BUTTONNAME parameter.
                 */
                if (jQueryVersion =~ /^1.([1|2|3]).(.*)/) {
                        // fix for older jQuery plugin versions
                        button = button.replaceFirst(/data\:jQuery\(this\)\.serialize\(\)/, "data:\'_eventId_${elementName}=1&\'+jQuery(this.form).serialize()")
                } else {
                        // as of jQuery plugin version 1.4.0.1 submitToRemote has been modified and the
                        // this.form part has been fixed. Consequently, our wrapper has changed as well... 
                        button = button.replaceFirst(/data\:jQuery/, "data:\'_eventId_${elementName}=1&\'+jQuery")
                }
 
                // add an after success function call?
                // usefull for performing actions on success data (hence on refreshed
                // wizard pages, such as attaching tooltips)
                if (afterSuccess) {
                        button = button.replaceFirst(/\.html\(data\)\;/, '.html(data);' + afterSuccess + ';')
                }

                // got an src parameter?
                if (src) {
                        def replace = 'type="image" src="' + src + '"'

                        if (alt) replace = replace + ' alt="' + alt + '"'

                        button = button.replaceFirst(/type="button"/, replace)
                }

                // replace double semi colons
                button = button.replaceAll(/;{2,}/, ';')
                
                // render button
                out << button
        }

        /**
         * generate ajax webflow redirect javascript
         *
         * As we have an Ajaxified webflow, the initial wizard page
         * cannot contain a wizard form, as upon a failing submit
         * (e.g. the form data does not validate) the form should be
         * shown again. However, the Grails webflow then renders the
         * complete initial wizard page into the success div. As this
         * ruins the page layout (a page within a page) we want the
         * initial page to redirect to the first wizard form to enter
         * the webflow correctly. We do this by emulating an ajax post
         * call which updates the wizard content with the first wizard
         * form.
         *
         * Usage: <wizard:ajaxFlowRedirect form="form#wizardForm" name="next" url="[controller:'wizard',action:'pages']" update="[success:'wizardPage',failure:'wizardError']" />
         * form = the form identifier
         * name = the action to execute in the webflow
         * update = the divs to update upon success or error
         *
         * Example initial webflow action to work with this javascript:
         * ...
         * mainPage {
         *      render(view: "/wizard/index")
         *      onRender {
         *              flow.page = 1
         *      }
         *      on("next").to "pageOne"
         * }
         * ...
         *
         * @param Map attributes
         * @param Closure body
         */
        def ajaxFlowRedirect = { attrs, body ->
                // define AJAX provider
                setProvider([library: ajaxProvider])

                // generate an ajax button
                def button = this.ajaxButton(attrs, body)

                // strip the button part to only leave the Ajax call
                button = button.replaceFirst(/<[^\"]*\"jQuery.ajax/,'jQuery.ajax')
                button = button.replaceFirst(/return false.*/,'')

                // change form if a form attribute is present
                if (attrs.get('form')) {
                        button = button.replaceFirst(/this\.form/,
                                "\\\$('" + attrs.get('form') + "')"
                        )
                }

                // generate javascript
                out << '<script language="JavaScript">'
                out << '$(document).ready(function() {'
                out << button
                out << '});'
                out << '</script>'
        }

        /**
         * render the content of a particular wizard page
         * @param Map attrs
         * @param Closure body  (help text)
         */
        def pageContent = {attrs, body ->
                // define AJAX provider
                setProvider([library: ajaxProvider])

                // render new body content
                out << render(template: "/wizard/common/tabs")
                out << '<div class="content">'
                out << body()
                out << '</div>'
                out << render(template: "/wizard/common/navigation")
                out << render(template: "/wizard/common/error")
        }

        /**
         * generate a base form element
         * @param String        inputElement name
         * @param Map           attributes
         * @param Closure       help content
         */
        def baseElement = { inputElement, attrs, help ->
                // work variables
                def description = attrs.remove('description')
                def addExampleElement = attrs.remove('addExampleElement')
                def addExample2Element  = attrs.remove('addExample2Element')

                // render a form element
                out << '<div class="element">'
                out << ' <div class="description">'
                out << description
                out << ' </div>'
                out << ' <div class="input">'
                out << "$inputElement"(attrs)
                if(help()) {
                        out << '        <div class="helpIcon"></div>'
                }

                // add an disabled input box for feedback purposes
                // @see dateElement(...)
                if (addExampleElement) {
                        def exampleAttrs = new LinkedHashMap()
                        exampleAttrs.name = attrs.get('name')+'Example'
                        exampleAttrs.class  = 'isExample'
                        exampleAttrs.disabled = 'disabled'
                        exampleAttrs.size = 30
                        out << textField(exampleAttrs)
                }

                // add an disabled input box for feedback purposes
                // @see dateElement(...)
                if (addExample2Element) {
                        def exampleAttrs = new LinkedHashMap()
                        exampleAttrs.name = attrs.get('name')+'Example2'
                        exampleAttrs.class  = 'isExample'
                        exampleAttrs.disabled = 'disabled'
                        exampleAttrs.size = 30
                        out << textField(exampleAttrs)
                }

                out << ' </div>'

                // add help content if it is available
                if (help()) {
                        out << '  <div class="helpContent">'
                        out << '    ' + help()
                        out << '  </div>'
                }

                out << '</div>'
        }

        /**
         * render a textFieldElement
         * @param Map attrs
         * @param Closure body  (help text)
         */
        def textFieldElement = { attrs, body ->
                // set default size, or scale to max length if it is less than the default size
                if (!attrs.get("size")) {
                        if (attrs.get("maxlength")) {
                                attrs.size = ((attrs.get("maxlength") as int) > defaultTextFieldSize) ? defaultTextFieldSize : attrs.get("maxlength")
                        } else {
                                attrs.size = defaultTextFieldSize
                        }
                }

                // render template element
                baseElement.call(
                        'textField',
                        attrs,
                        body
                )
        }


        /**
         * render a select form element
         * @param Map attrs
         * @param Closure body  (help text)
         */
        def selectElement = { attrs, body ->
                baseElement.call(
                        'select',
                        attrs,
                        body
                )
        }

        /**
         * render a checkBox form element
         * @param Map attrs
         * @param Closure body  (help text)
         */
        def checkBoxElement = { attrs, body ->
                baseElement.call(
                        'checkBox',
                        attrs,
                        body
                )
        }

        /**
         * render a dateElement
         * NOTE: datepicker is attached through wizard.js!
         * @param Map attrs
         * @param Closure body  (help text)
         */
        def dateElement = { attrs, body ->
                // transform value?
                if (attrs.value instanceof Date) {
                        // transform date instance to formatted string (dd/mm/yyyy)
                        attrs.value = String.format('%td/%<tm/%<tY', attrs.value)
                }
                
                // set some textfield values
                attrs.maxlength = (attrs.maxlength) ? attrs.maxlength : 10
                attrs.addExampleElement = true
                
                // render a normal text field
                //out << textFieldElement(attrs,body)
                textFieldElement.call(
                        attrs,
                        body
                )
        }

        /**
         * render a dateElement
         * NOTE: datepicker is attached through wizard.js!
         * @param Map attrs
         * @param Closure body  (help text)
         */
        def timeElement = { attrs, body ->
                // transform value?
                if (attrs.value instanceof Date) {
                        // transform date instance to formatted string (dd/mm/yyyy)
                        attrs.value = String.format('%td/%<tm/%<tY %<tH:%<tM', attrs.value)
                }

                attrs.addExampleElement = true
                attrs.addExample2Element = true
                attrs.maxlength = 16

                // render a normal text field
                //out << textFieldElement(attrs,body)
                textFieldElement.call(
                        attrs,
                        body
                )
        }
        
        /**
         * Template form element
         * @param Map           attributes
         * @param Closure       help content
         */
        def speciesElement = { attrs, body ->
                // render template element
                baseElement.call(
                        'speciesSelect',
                        attrs,
                        body
                )
        }

        /**
         * Button form element
         * @param Map           attributes
         * @param Closure       help content
         */
        def buttonElement = { attrs, body ->
                // render template element
                baseElement.call(
                        'ajaxButton',
                        attrs,
                        body
                )
        }

        /**
         * render a species select element
         * @param Map attrs
         */
        def speciesSelect = { attrs ->
                // fetch the speciesOntology
                // note that this is a bit nasty, probably the ontologyName should
                // be configured in a configuration file... --> TODO: centralize species configuration
                def speciesOntology = Ontology.findByName('NCBI Taxonomy')

                // fetch all species
                attrs.from = Term.findAllByOntology(speciesOntology)

                // got a name?
                if (!attrs.name) {
                        // nope, use a default name
                        attrs.name = 'species'
                }

                out << select(attrs)
        }

        /**
         * Template form element
         * @param Map           attributes
         * @param Closure       help content
         */
        def templateElement = { attrs, body ->
                // render template element
                baseElement.call(
                        'templateSelect',
                        attrs,
                        body
                )
        }
        
        /**
         * render a template select element
         * @param Map attrs
         */
        def templateSelect = { attrs ->
                // fetch all templates
                attrs.from = Template.findAll() // for now, all templates

                // got a name?
                if (!attrs.name) {
                        attrs.name = 'template'
                }
                
                out << select(attrs)
        }

        /**
         * Term form element
         * @param Map           attributes
         * @param Closure       help content
         */
        def termElement = { attrs, body ->
                // render term element
                baseElement.call(
                        'termSelect',
                        attrs,
                        body
                )
        }

        /**
         * render a term select element
         * @param Map attrs
         */
        def termSelect = { attrs ->
                // fetch all terms
                attrs.from = Term.findAll()     // for now, all terms as we cannot identify terms as being treatment terms...

                // got a name?
                if (!attrs.name) {
                        attrs.name = 'term'
                }

                out << select(attrs)
        }

        def show = { attrs ->
                // is object parameter set?
                def o = attrs.object

                println o.getProperties();
                o.getProperties().each {
                        println it
                }

                out << "!! test version of 'show' tag !!"
        }

        /**
         * render table headers for all subjectFields in a template
         * @param Map attributes
         */
        def templateColumnHeaders = { attrs ->
                def template = attrs.remove('template')

                // output table headers for template fields
                template.subjectFields.each() {
                        out << '<div class="' + attrs.get('class') + '">' + it + '</div>'
                }
        }

        /**
         * render table input elements for all subjectFields in a template
         * @param Map attributes
         */
        def templateColumns = { attrs, body ->
                def subject                     = attrs.remove('subject')
                def subjectId           = attrs.remove('id')
                def template            = attrs.remove('template')
                def intFields           = subject.templateIntegerFields
                def stringFields        = subject.templateStringFields
                def floatFields         = subject.templateFloatFields
                def termFields          = subject.templateTermFields

                // output columns for these subjectFields
                template.subjectFields.each() {
                        // output div
                        out << '<div class="' + attrs.get('class') + '">'

                        switch (it.type) {
                                case 'STRINGLIST':
                                        // render stringlist subjectfield
                                        if (!it.listEntries.isEmpty()) {
                                                out << select(
                                                        name: attrs.name + '_' + it.name,
                                                        from: it.listEntries,
                                                        value: (stringFields) ? stringFields.get(it.name) : ''
                                                )
                                        } else {
                                                out << '<span class="warning">no values!!</span>'
                                        }
                                        break;
                                case 'INTEGER':
                                        // render integer subjectfield
                                        out << textField(
                                                name: attrs.name + '_' + it.name,
                                                value: (intFields) ? intFields.get(it.name) : ''
                                        )
                                        break;
                                case 'FLOAT':
                                        // render float subjectfield
                                        out << textField(
                                                name: attrs.name + '_' + it.name,
                                                value: (floatFields) ? floatFields.get(it.name) : ''
                                        )
                                        break;
                                default:
                                        // unsupported field type
                                        out << '<span class="warning">!'+it.type+'</span>'
                                        break;
                        }
                        out << '</div>'
                }
        }
}