webhelpers.html.tools

HTML helpers that are more than just simple tags.

There are no helpers to prettify HTML or canonicalize whitespace because BeautifulSoup and HTMLTidy handle this well.

Turn all urls and email addresses into clickable links.

link
Used to determine what to link. Options are “all”, “email_addresses”, or “urls”
href_attrs
Additional attributes for generated <a> tags.

Example:

>>> auto_link("Go to http://www.planetpython.com and say hello to guido@python.org")
literal(u'Go to <a href="http://www.planetpython.com">http://www.planetpython.com</a> and say hello to <a href="mailto:guido@python.org">guido@python.org</a>')
webhelpers.html.tools.button_to(name, url='', **html_attrs)

Generate a form containing a sole button that submits to url.

Use this method instead of link_to for actions that do not have the safe HTTP GET semantics implied by using a hypertext link.

The parameters are the same as for link_to. Any html_attrs that you pass will be applied to the inner input element. In particular, pass

disabled = True/False

as part of html_attrs to control whether the button is disabled. The generated form element is given the class ‘button-to’, to which you can attach CSS styles for display purposes.

The submit button itself will be displayed as an image if you provide both type and src as followed:

type=’image’, src=’icon_delete.gif’

The src path should be the exact URL desired. A previous version of this helper added magical prefixes but this is no longer the case.

Example 1:

# inside of controller for "feeds"
>> button_to("Edit", url(action='edit', id=3))
<form method="post" action="/feeds/edit/3" class="button-to">
<div><input value="Edit" type="submit" /></div>
</form>

Example 2:

>> button_to("Destroy", url(action='destroy', id=3), 
.. method='DELETE')
<form method="POST" action="/feeds/destroy/3" 
 class="button-to">
<div>
    <input type="hidden" name="_method" value="DELETE" />
    <input value="Destroy" type="submit" />
</div>
</form>

Example 3:

# Button as an image.
>> button_to("Edit", url(action='edit', id=3), type='image', 
.. src='icon_delete.gif')
<form method="POST" action="/feeds/edit/3" class="button-to">
<div><input alt="Edit" src="/images/icon_delete.gif"
 type="image" value="Edit" /></div>
</form>

Note

This method generates HTML code that represents a form. Forms are “block” content, which means that you should not try to insert them into your HTML where only inline content is expected. For example, you can legally insert a form inside of a div or td element or in between p elements, but not in the middle of a run of text, nor can you place a form within another form. (Bottom line: Always validate your HTML before going public.)

Changed in WebHelpers 1.2: Preserve case of “method” arg for XHTML compatibility. E.g., “POST” or “PUT” causes method=”POST”; “post” or “put” causes method=”post”.

webhelpers.html.tools.js_obfuscate(content)

Obfuscate data in a Javascript tag.

Example:

>>> js_obfuscate("<input type='hidden' name='check' value='valid' />")
literal(u'<script type="text/javascript">\n//<![CDATA[\neval(unescape(\'%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65%28%27%3c%69%6e%70%75%74%20%74%79%70%65%3d%27%68%69%64%64%65%6e%27%20%6e%61%6d%65%3d%27%63%68%65%63%6b%27%20%76%61%6c%75%65%3d%27%76%61%6c%69%64%27%20%2f%3e%27%29%3b\'))\n//]]>\n</script>')
webhelpers.html.tools.highlight(text, phrase, highlighter=None, case_sensitive=False, class_='highlight', **attrs)

Highlight all occurrences of phrase in text.

This inserts “<strong class=”highlight”>...</strong>” around every occurrence.

Arguments:

text:
The full text.
phrase:
A phrase to find in the text. This may be a string, a list of strings, or a compiled regular expression. If a string, it’s regex-escaped and compiled. If a list, all of the strings will be highlighted. This is done by regex-escaping all elements and then joining them using the regex “|” token.
highlighter:
Deprecated. A replacement expression for the regex substitution. This was deprecated because it bypasses the HTML builder and creates tags via string mangling. The previous default was ‘<strong class=”highlight”>1</strong>’, which mimics the normal behavior of this function. phrase must be a string if highlighter is specified. Overrides class_ and attrs_ arguments.
case_sensitive:
If false (default), the phrases are searched in a case-insensitive manner. No effect if phrase is a regex object.
class_:
CSS class for the <strong> tag.
**attrs:
Additional HTML attributes for the <strong> tag.

Changed in WebHelpers 1.0b2: new implementation using HTML builder. Allow phrase to be list or regex. Deprecate highlighter and change its default value to None. Add case_sensitive, class_, and **attrs arguments.

webhelpers.html.tools.mail_to(email_address, name=None, cc=None, bcc=None, subject=None, body=None, replace_at=None, replace_dot=None, encode=None, **html_attrs)

Create a link tag for starting an email to the specified email_address.

This email_address is also used as the name of the link unless name is specified. Additional HTML options, such as class or id, can be passed in the html_attrs hash.

You can also make it difficult for spiders to harvest email address by obfuscating them.

Examples:

>>> mail_to("me@domain.com", "My email", encode = "javascript")
literal(u'<script type="text/javascript">\n//<![CDATA[\neval(unescape(\'%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65%28%27%3c%61%20%68%72%65%66%3d%22%6d%61%69%6c%74%6f%3a%6d%65%40%64%6f%6d%61%69%6e%2e%63%6f%6d%22%3e%4d%79%20%65%6d%61%69%6c%3c%2f%61%3e%27%29%3b\'))\n//]]>\n</script>')

>>> mail_to("me@domain.com", "My email", encode = "hex")
literal(u'<a href="&#109;&#97;&#105;&#108;&#116;&#111;&#58;%6d%65@%64%6f%6d%61%69%6e.%63%6f%6d">My email</a>')

You can also specify the cc address, bcc address, subject, and body parts of the message header to create a complex e-mail using the corresponding cc, bcc, subject, and body keyword arguments. Each of these options are URI escaped and then appended to the email_address before being output. Be aware that javascript keywords will not be escaped and may break this feature when encoding with javascript.

Examples:

>>> mail_to("me@domain.com", "My email", cc="ccaddress@domain.com", bcc="bccaddress@domain.com", subject="This is an example email", body= "This is the body of the message.")
literal(u'<a href="mailto:me@domain.com?cc=ccaddress%40domain.com&amp;bcc=bccaddress%40domain.com&amp;subject=This%20is%20an%20example%20email&amp;body=This%20is%20the%20body%20of%20the%20message.">My email</a>')

Strip link tags from text leaving just the link label.

Example:

>>> strip_links('<a href="something">else</a>')
'else'
webhelpers.html.tools.strip_tags(text)

Delete any HTML tags in the text, leaving their contents intact. Convert newlines to spaces, and <br /> to newlines.

Example::
>>> strip_tags('Text <em>emphasis</em> <script>Javascript</script>.')
'Text emphasis Javascript.'
>>> strip_tags('Ordinary <!-- COMMENT! --> text.')
'Ordinary  COMMENT!  text.'
>>> strip_tags('Line\n1<br />Line 2')
'Line 1\nLine 2'

Implementation copied from WebOb.

webhelpers.html.converters contains more sophisticated versions of this.

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