This module contains functions and classes that help integrate the Dojo Toolkit javascript library with Django. Supports defining theme, stylesheets, required modules, and addOnLoad functions from Django. Django form fields can be instrumented to be instantiated as Dijit form objects programmatically.
Full instructions on limscoder.com.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 | """Integrates Dojo with Django."""
import json
import uuid
# Used to convert Django Field attributes to Dojo attributes.
#
# Key is Django Field attribute name.
# Value is tuple.
# [0] == Dijit attribute name
# [1] == callable to convert Django value to Dijit value
default_attr_map = {
'required': ('required', None),
'min_length': ('minLength', None),
'max_length': ('maxLength', None),
'regex': ('regExp', lambda a: a.pattern)
}
def dojo_field(field, dojo_type, attr_map=None, dojo_attrs=None):
"""
Instruments a Django form.Field with Dijit parameters.
arguments
==========
* field - Django form.Field to instrument.
* dojo_type - str, qualified class name of dijit class to use.
* attr_map - dict, optional mapping between Django and Dojo
attrs, see default_attr_map comments for format.
* dojo_attrs - dict, Attributes to apply to Dijit.
"""
# Specifies mapping between Django field attributes
# and Dijit attributes
if attr_map is not None:
map = dict(default_attr_map)
map.update(attr_map)
else:
map = default_attr_map
# Get mapped attributes from Django field
attrs = {}
for attr, mapper in map.iteritems():
val = getattr(field, attr, None)
if val is None:
continue
if mapper[1] is not None:
val = mapper[1](val)
attrs[mapper[0]] = val
# Convert Error message
error_msgs = getattr(field, 'error_messages', None)
if error_msgs is not None:
invalid_msg = error_msgs.get('invalid', None)
if invalid_msg is not None:
# Django uses a
# lazy proxy when this property is not
# explicitly set. json encoder will choke
# on the proxy object. Calling a method
# causes the proxy to be evaluated and
# json encoder is happy.
attrs['invalidMessage'] = invalid_msg.rstrip()
# Add user defined attributes
if dojo_attrs is not None:
attrs.update(dojo_attrs)
# Attach Dojo attributes to field
field._dojo_type = dojo_type
field._dojo_params = attrs
class Dojo(object):
"""Keeps track of Dojo properties."""
def __init__(self, src, enabled=True, theme='tundra',
dj_config=None, form_function=None):
self.enabled = enabled
self.dj_config = dj_config
self.form_function = form_function
self._src = src
self._stylesheets = ['/'.join((self._src, 'dojo', 'resources', 'dojo.css'))]
self._modules = [] #required_modules
self._aols = [] # addOnLoad functions
self.theme = theme
def get_src(self):
return self._src
src = property(get_src)
def get_theme(self):
return self._theme
def set_theme(self, val):
def _get_theme_css(theme):
return '/'.join((self._src, 'dijit', 'themes',
theme, '%s.css' % theme))
current_theme = getattr(self, '_theme', None)
if current_theme is not None:
theme_css = _get_theme_css(current_theme)
if theme_css in self._stylesheets:
self._stylesheets.remove(theme_css)
self._theme = val
theme_css = _get_theme_css(self._theme)
self.append_stylesheet(theme_css)
theme = property(get_theme, set_theme)
def get_modules(self):
return self._modules
def set_modules(self, val):
self._modules = val
modules = property(get_modules, set_modules)
def get_stylesheets(self):
return self._stylesheets
def set_stylesheets(self, val):
self._stylesheets = val
stylesheets = property(get_stylesheets, set_stylesheets)
def get_aols(self):
return self._aols
def set_aols(self, val):
self._aols = val
aols = property(get_aols, set_aols)
def set_module_path(self, module, path):
"""Short cut for setting module path in djConfig."""
if 'modulePaths' not in self.dj_config:
self.dj_config['modulePaths'] = {}
self.dj_config['modulePaths'][module] = path
def append_module(self, module):
"""Add a required module."""
if module not in self._modules:
self._modules.append(module)
def append_stylesheet(self, stylesheet):
"""Add a stylesheet."""
if stylesheet not in self._stylesheets:
self._stylesheets.append(stylesheet)
def append_aol(self, aol):
"""Add an addOnLoad function."""
self._aols.append(aol)
def prepend_aol(self, aol):
self._aols.insert(0, aol)
def dojo_form(self, form, form_function=None):
"""
Generates Javascript to instrument a Dijit form.
Adds an addOnLoad handler that instantiates a
Dijit form when the page loads.
Any fields that have been setup with dojo_field
will also be instantiated as Dijits.
"""
dijits = []
for bound_field in form:
field = bound_field.field
dojo_type = getattr(field, '_dojo_type', None)
if dojo_type is not None:
# This is a dojo enabled widget
params = getattr(field, '_dojo_params', {})
params['dojoType'] = dojo_type
self.append_module(dojo_type)
dijits.append({'name': bound_field.name, 'params': params})
json_dijits = json.dumps(dijits)
self.append_module('dijit.form.Form')
if getattr(form, 'id', None) is None:
# Form must have a unique id for
# JS form instrumentation to work
# correctly.
form.id = str(uuid.uuid1())
if form_function is None:
# Form function wasn't passed,
# use form_function member var instead
form_function = self.form_function
if form_function is None:
# Generate JS
self.append_module('dojo.parser')
self.append_aol(self._build_form_js(form.id, json_dijits))
else:
# Call existing JS function
self.append_module(form_function[0])
function_name = '.'.join(form_function)
function_call = "function() {%s('%s', %s);}" % (function_name, form.id, json_dijits)
self.append_aol(function_call)
def _build_form_js(self, form_id, json_dijits):
"""Builds a JS function string used to dijitize a form."""
return """
function () {
var dijitForm = dojo.byId('%(form_id)s');
if (dijitForm != null) {
var elements = [];
var dijits = %(json_dijits)s;
dojo.forEach(dijits, function(dijit) {
var n = dijitForm.elements[dijit.name];
if (n != null) {
dojo.attr(n, dijit.params);
elements.push(n);
}
});
dojo.attr(dijitForm, {dojoType: 'dijit.form.Form'});
elements.push(dijitForm);
dojo.parser.instantiate(elements);
}
}
""" % {'form_id': form_id, 'json_dijits': json_dijits}
|
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