Login

Templatetag startswith + message tuned

Author:
io_error
Posted:
June 15, 2008
Language:
Python
Version:
.96
Tags:
template templatetags message
Score:
-1 (after 1 ratings)

Template:

    `<div id="messageBox_{{ forloop.counter0 }}" style="border:1px solid #ccc;background-color:white" onclick="document.getElementById ('messageBox_{{ forloop.counter0 }}').style.display = 'none';">
        {% ifstartswith message "#ok#" %}
        <font color="green">
        {% endifstartswith %}

        {% ifstartswith message "#error#" %}
        <font color="red">
        {% endifstartswith %}
        {{ message|cut:"#ok#"|cut:"#error#" }}
        </font>
    </div>`

In a view you can now do something like that: request.user.message_set.create(message="#ok#Hello User, this is a ok message!")

 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
# -*- coding: utf-8 -*-

from django import template
from django.template import Node, NodeList, Variable, VariableDoesNotExist

register = template.Library()

def do_startswith(parser, token, negate):
    try:
        # split_contents() knows not to split quoted strings.
        tag_name, string, start_string = token.split_contents()
    except ValueError:
        raise template.TemplateSyntaxError, "%r tag requires two arguments" % token.contents.split()[0]
    if not (start_string[0] == start_string[-1] and start_string[0] in ('"', "'")):
        raise template.TemplateSyntaxError, "%r start strings argument should be in quotes" % tag_name
    
    end_tag = 'end' + tag_name
    nodelist_true = parser.parse(('else', end_tag))
    token = parser.next_token()
    if token.contents == 'else':
        nodelist_false = parser.parse((end_tag,))
        parser.delete_first_token()
    else:
        nodelist_false = NodeList()
    return IfStartsWithNode(string, start_string, nodelist_true, nodelist_false, negate)

class IfStartsWithNode(Node):
    def __init__(self, string, start_string, nodelist_true, nodelist_false, negate):
        self.start_string, self.string = Variable(start_string), Variable(string)
        self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false
        self.negate = negate
        self.negate = negate

    def __repr__(self):
        return "<IfStartsWithNode>"

    def render(self, context):
        try:
            string = self.string.resolve(context)
        except VariableDoesNotExist:
            string = None
        try:
            start_string = self.start_string.resolve(context)
        except VariableDoesNotExist:
            start_string = None
                    
        if (self.negate and not string.startswith(start_string)) or (not self.negate and string.startswith(start_string)):
            return self.nodelist_true.render(context)
        return self.nodelist_false.render(context)

#@register.tag
def ifstartswith(parser, token):
    return do_startswith(parser, token, False)
ifstartswith = register.tag(ifstartswith)

#@register.tag
def ifnotstartswith(parser, token):
    return do_startswith(parser, token, True)
ifnotstartswith = register.tag(ifnotstartswith)

More like this

  1. Cookie based flash errors and notices (a la Rails) by alexk 6 years, 7 months ago
  2. really spaceless (trim spaces at line start) by wolfram 7 years, 3 months ago
  3. load m2m fields objects by dirol 4 years, 10 months ago
  4. Digg-like pagination by SmileyChris 5 years, 11 months ago
  5. Link filter by sean2000 7 years, 4 months ago

Comments

dnordberg (on June 16, 2008):

Better to do something like this instead:

@register.filter
def startswith(value, arg):
    """Usage, {% if value|starts_with:"arg" %}"""
    return value.startswith(arg)

#

Please login first before commenting.