Replacing Words in TextField In Django

In django, in TextField, how to we replace,

[vimeo 123456]

with

<iframe src="http://player.vimeo.com/video/123456" width="4开发者_运维技巧00" height="225" frameborder="0"></iframe>

Thank you.

I don't think it's a good idea to have the HTML in the TextField. First, it would make editing a pain (you'd have to write code to translate back, which will be more difficult than forward); second, it would waste disk on storing a lot of HTML in the database; and finally, it would make it harder to fix bugs later (such as if Vimeo changed their URL format).

You have two options that I can see:

1. View Function

Do this translation in your view function. Your view function would have a line like:

context["commentText"] = process_markup(thePost.commentText)

Then, in your template file, you need to mark the field as safe since you've already filtered it:

{{ commentText|safe }}

2. Custom Filter

Do this translation in a custom filter tag, like the restructuredtext filter in django.contrib.markup. This is what sebpiq recommended, and is probably the better option.

from django.template.defaultfilters import stringfilter
import re

@stringfilter
def mymarkup(value):
    return process_markup(value)

Then, in your template file, you need to call your filter:

{{ commentText|mymarkup }}

In both cases, you would need to write process_markup(value), which would look something like:

import re

_TAGS = [
    # First, escape anything that might be misinterpreted.  Order is important.
    (r'&', r'&'),
    (r'<', r'&lt;'),
    (r'>', r'&gt;'),
    (r'"', r'&quot;'),
    (r"'", r'&#39;'),

    # Simple tags
    (r'\[b\]', r'<b>'),
    (r'\[/b\]', r'</b>'),

    # Complex tags with parameters
    (r'\[vimeo +(\d+) *\]', r'<iframe src="http://player.vimeo.com/video/\g<1>"'
        r' width="400" height="225" frameborder="0"></iframe>'),
]

def process_markup(value):
    for pattern, repl in _TAGS:
        value = re.sub(pattern, repl, value)
    return value

There are probably better ways to write this function, but you get the idea.

Don't do this in your TextField. Rather in the templates. But then you have to parse the value, so I would suggest you write a simple template filter :

from django.template.defaultfilters import stringfilter
import re

@stringfilter
def textfieldtourl(value):
    #parsing of your '[vimeo <id>]'
    #return "http://player.vimeo.com/video/<id>"

And then in template :

<iframe src="{{ my_object.my_text_field|textfieldtourl }}" width="400" height="225" frameborder="0"></iframe>

Where my_object is the object on which your TextField is defined, my_text_field is the name of your TextField, and textfieldtourl is the name of the filter you'll define to replace a code like [vimeo 1235] by an actual url.

More infos on writing custom template fiters.