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zope.html 2.4.2

HTML and XHTML Editing Support

This package contains support for editing HTML and XHTML inside a web page using the FCKeditor as a widget. This is a fairly simple application of FCKeditor, and simply instantiates a pre-configured editor for each widget. There are no options to control the editors individually.

Detailed Documentation

HTML file editing support

This package contains support for editing HTML and XHTML inside a web page using the FCKeditor as a widget. This is a fairly simple application of FCKeditor, and simply instantiates a pre-configured editor for each widget. There are no options to control the editors individually.

In creating this, we ran into some limitations of the editor that are worth being aware of. Noting these as limitations does not mean that other editors do any better; what’s available seems to be a mixed bag.

  • The editor only deals with what can be contained inside a <body> element; anything that goes outside that, including the <body> and </body> tags, get lost or damaged. If there’s any way to configure FCKeditor to deal with such material, it isn’t documented.
  • There’s no real control of the HTML source; whitespace is not preserved as a programmer would expect. That’s acceptable in many use cases, but not all. Applications should avoid using this widget if the original whitespace must be maintained.

Implementation problems

These are problems with the widget used to integrate FCKeditor rather than problems with FCKeditor itself. These should be dealt with.

  • The width of the editor is hardcoded; this should be either configurable or the editor should stretch to fill the available space. The sample uses of the FCKeditor don’t seem to exhibit this problem, so it can be better than it is.
  • The height of the editor should be configurable in a way similar to the configuration of the basic textarea widget.

Ideas for future development

These ideas might be interesting to pursue, but there are no specific plans to do so at this time:

  • Categorize the applications of the editor and provide alternate toolbar configurations for those applications. There’s a lot of configurability in the editor itself, so it can be made to do different things.

  • Add support for some of the other fancy client-side HTML editors, and allow a user preference to select which to use for what applications, including the option of disabling the GUI editors when detailed control over the HTML is needed (or for luddite users who don’t like the GUI editors).

    XINHA (http://xinha.python-hosting.com/) appears to be an interesting option as well, and may be more usable for applications that want more than editing of small HTML fragments, especially if the user is fairly HTML-savvy.

    HTMLArea (http://www.dynarch.com/projects/htmlarea/) may become interesting at some point, but a rough reading at this time indicates that XINHA may be a more reasonable route.

Management of supplemental information

The zope.html package provides additional views on files containing HTML and XHTML data that allow editing the files over the web. The files may contain either complete documents or fragments that may be composed into larger documents. Preview views are also provided.

The editing and preview views rely on getting supplemental information about the file being edited using the IEditableHtmlInformation adapter for the file. That adapter uses annotations on the content object to store information that needs to be persisted.

The IEditableHtmlInformation interface is very simple; there’s only one field defined, and it’s a simple boolean value: whether the file should be treated as a fragment or not. Let’s create a simple content object that we can use for testing:

>>> import zope.file.file
>>> import zope.interface
>>> import zope.annotation

>>> class File(zope.file.file.File):
...     zope.interface.implements(
...         zope.annotation.IAttributeAnnotatable)
...
...     def __init__(self, text=None):
...         super(File, self).__init__("text/html", {"charset": "utf-8"})
...         f = self.open("w")
...         f.write(text)
...         f.close()

Let’s create a file and the corresponding IEditableHtmlInformation object:

>>> import zope.html.docinfo

>>> file = File("This is a <em>fragment</em>.")
>>> info = zope.html.docinfo.EditableHtmlInformation(file)

We can now check that the initial value of the isFragment attribute is computed reasonably:

>>> info.isFragment
True

The user can cause the isFragment flag to be toggled from the UI, so it should remember the current state of the flag:

>>> info.isFragment = False
>>> info.isFragment
False

A new instance of the IEditableHtmlInformation instance should also remember the last value of the setting:

>>> zope.html.docinfo.EditableHtmlInformation(file).isFragment
False

(X)HTML fragment editor widget

The widget included in this package is a simple application of the FCKeditor control. It is only expected to work for fragments, not for arbitrary documents. Let’s create a field and a widget:

>>> from zope.html import field
>>> from zope.html import widget
>>> from zope.publisher import browser

>>> class Context(object):
...     sample = u""

>>> myfield = field.XhtmlFragment(
...     __name__="sample",
...     title=u"Sample Field",
...     ).bind(Context())

>>> request = browser.TestRequest()
>>> mywidget = widget.FckeditorWidget(myfield, request)
>>> mywidget.setPrefix("form")

>>> mywidget.configurationPath = "/myconfig.js"
>>> mywidget.editorWidth = 360
>>> mywidget.editorHeight = 200
>>> mywidget.toolbarConfiguration = "mytoolbars"

>>> print mywidget()
<textarea...></textarea>
<script...
"form.sample", 360, 200, "mytoolbars");
...Config["CustomConfigurationsPath"] = "/myconfig.js";
...
</script>
<BLANKLINE>

We should also test the CkeditorWidget.

>>> ckwidget = widget.CkeditorWidget(myfield, request)
>>> ckwidget.configurationPath = "/myconfig.js"
>>> ckwidget.editorHeight = 200

The “fckVersion” attribute holds the version of CKEditor library.

>>> ckwidget.fckVersion
'3.6.2'
>>> print ckwidget()
<textarea...></textarea>
<script...
...height: 200...
...customConfig : "/myconfig.js"...
</script>
<BLANKLINE>

Views on editable HTML

Let’s start by uploading some HTML to create a file object:

>>> import StringIO
>>> sio = StringIO.StringIO("This is a <em>fragment</em>."
...                         "  There's one 8-bit Latin-1 character: \xd8.")

>>> from zope.testbrowser.testing import Browser
>>> browser = Browser()
>>> browser.addHeader("Authorization", "Basic user:userpw")
>>> browser.addHeader("Accept-Language", "en-US")
>>> browser.open("http://localhost/@@+/zope.file.File")

>>> ctrl = browser.getControl(name="form.data")
>>> ctrl.mech_control.add_file(sio, "text/html", "sample.html")
>>> browser.getControl("Add").click()

We can see that the MIME handlers have marked this as HTML content:

>>> import zope.mimetype.types
>>> file = getRootFolder()["sample.html"]
>>> zope.mimetype.types.IContentTypeTextHtml.providedBy(file)
True

The “Edit” view can be used to check and modify the “Is fragment?” field, which is stored by the views in an annotation on the object. The particular fragment we uploaded here should be see as a fragment by default:

>>> browser.getLink("sample.html").click()
>>> browser.getLink("Edit").click()

>>> browser.open("http://localhost/sample.html/@@htmledit.html")
>>> ctrl = browser.getControl(name="form.isFragment")
>>> ctrl.value
True

The setting can be toggle by unchecking the checkbox and clicking “Save”:

>>> ctrl.value = False
>>> browser.getControl("Save").click()
>>> ctrl = browser.getControl(name="form.isFragment")
>>> ctrl.value
False

The edit view also allows editing of the HTML content if the document can be decoded. If the encoding of the document is not known, the document cannot be edited by the user is prompted to select an encoding that should be used.

Our example document does not have a specified encoding, so we expect the form to indicate that the encoded is needed, and to allow the user to select and encoding. Let’s reload the form to get rid of the “Updated…” message so we can see what the user is told:

>>> browser.getLink("Edit").click()

>>> print browser.contents
<...Can't decode text for editing; please specify the document encoding...

>>> ctrl = browser.getControl(name="form.encoding")
>>> ctrl.value
['']

The user can then select an encoding:

>>> ctrl.value = ["utf-8"]
>>> browser.getControl("Save").click()

Since we just selected an encoding that doesn’t work with the Latin-1 data we uploaded for the file, we’re told that that encoding is not acceptable:

>>> print browser.contents
<...Selected encoding cannot decode document...

We need to select an encoding that actually makes sense for the data that we’ve uploaded:

>>> ctrl = browser.getControl(name="form.encoding")
>>> ctrl.value = ["iso-8859-1"]
>>> browser.getControl("Save").click()

Now that the encoding has been saved, the document can be encoded and edited, and the encoding selection will no longer be available on the form:

>>> browser.getControl(name="form.encoding")
Traceback (most recent call last):
  ...
LookupError: name 'form.encoding'...

Since our selected encoding does not support all Unicode characters, there is an option available to allow re-encoding of the document if the content being saved after editing cannot be encoded in the original encoding of the document. The value of this option defaults to False since the user needs to be aware that the document encoding may be modified:

>>> browser.getControl(name="form.reencode").value
False

If we edit the text such that characters are included that cannot be encoded in the current encoding and try to save our changes without allowing re-encoding, we see a notification that the document can’t be encoded in the original encoding and that re-encoding is needed:

>>> ctrl = browser.getControl(name="form.text")
>>> ctrl.value = u"\u3060\u3051\u306e\u30b5\u30a4\u30c8".encode("utf-8")

>>> browser.getControl("Save").click()

>>> print browser.contents
<...Can't encode text in current encoding...

At this point, we can select the “Re-encode” option to allow the text to be saved in an encoding other than the original; this would allow us to save any text:

>>> browser.getControl(name="form.reencode").value = True
>>> browser.getControl("Save").click()

>>> print browser.contents
<...Updated on ...

If we now take a look at the “Content Type” view for the file, we see that the encoding has been updated to UTF-8:

>>> browser.getLink("Content Type").click()

>>> browser.getControl(name="form.encoding").value
['utf-8']

CHANGES

2.4.2 (2014-04-17)

  • Remove unneeded zope.app.authentication/debugskin/server test dependencies.
  • Support for test output changed in zope.testbrowser 4.0.3

2.4.1 (2012-01-26)

  • Fix path of CKEditor resources.

2.4.0 (2012-01-26)

  • Use CKEditor 3.6.2
  • Using Python’s doctest module instead of deprecated zope.testing.doctest.

2.3.0 (2011-02-22)

  • Use CKEditor 3.5.2

2.2.0 (2010-11-19)

  • Make the use of un-minified ckeditor source explicit

2.1.0 (2010-05-25)

  • Use CKEditor 3.2.1
  • Added configuration to use un-minified version of CKEditor when using dev mode.
  • Fixed import that caused test failures.

2.0.0 (2009-09-04)

  • Add CKeditor 3.0 widget.

1.2.0 (2009-07-06)

  • Use FCKeditor 2.6.4.1
  • Remove _samples directory and erect a barrier to its resurrection

1.1.0 (2008-06-18)

  • Use FCKeditor 2.6
  • Use versioned directories for javascript to cache-bust

1.0.1 (2007-11-02)

  • Package data update.
  • Updated code to work with packages in Zope 3.4 release.

1.0.0 (2007-10-29)

  • Initial release.
 
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