Golang html/template versus Python Jinja2 (4) - Arrays and Slices Index
source link: https://siongui.github.io/2015/03/06/python-jinja2-vs-go-html-template-array-slice-index/
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Golang html/template versus Python Jinja2 (4) - Arrays and Slices Index
March 06, 2015When loop through the arrays/slices (Go) or lists (Python) in templates, sometimes the loop index is needed. This post shows how to access loop index in Python Jinja2 and Go html/template.
In Jinja2, loop.index or loop.index0 is used to access the loop index, starting from 1 or 0. (see [a])
In Go html/template, one more variable is declared in range action to access loop index, starting from 0. (see [b])
Go html/template versue Python Jinja2 - Arrays and Slices Index Go html/template Python Jinja2
template:
{{range $index, $link := .}}
{{$index}}: <a href="{{$link.Href}}">{{$link.Name}}</a>
{{end}}
template:
{# index start from 0 #}
{% for link in links %}
{{loop.index0}}: <a href="{{link.href}}">{{link.name}}</a>
{% endfor %}
{# index start from 1 #}
{% for link in links %}
{{loop.index}}: <a href="{{link.href}}">{{link.name}}</a>
{% endfor %}
template values:
type Link struct {
Name string
Href string
}
// arrays
var la [2]Link
la[0] = Link{"Google", "https://www.google.com/"}
la[1] = Link{"Facebook", "https://www.facebook.com/"}
// slices
var ls []Link
ls = append(ls, Link{"Google", "https://www.google.com/"})
ls = append(ls, Link{"Facebook", "https://www.facebook.com/"})
template values:
links = [
{'name': 'Google', 'href': 'https://www.google.com'},
{'name': 'Facebook', 'href': 'https://www.facebook.com'}
]
Complete Go html/template source code:
html-template-example-3.go | repository | view rawpackage main
import (
"html/template"
"os"
)
const tmpl = `
{{range $index, $link := .}}
{{$index}}: <a href="{{$link.Href}}">{{$link.Name}}</a>
{{end}}
`
type Link struct {
Name string
Href string
}
func main() {
// arrays
var la [2]Link
la[0] = Link{"Google", "https://www.google.com/"}
la[1] = Link{"Facebook", "https://www.facebook.com/"}
t, _ := template.New("foo").Parse(tmpl)
t.Execute(os.Stdout, la)
// slices
var ls []Link
ls = append(ls, Link{"Google", "https://www.google.com/"})
ls = append(ls, Link{"Facebook", "https://www.facebook.com/"})
t.Execute(os.Stdout, ls)
}
Complete Python Jinja2 source code:
jinja2-example-3.py | repository | view raw#!/usr/bin/env python
# -*- coding:utf-8 -*-
from jinja2 import Template
import sys
tmpl = """
{% for link in links %}
{{ loop.index0 }}: <a href="{{link.href}}">{{link.name}}</a>
{{ loop.index }}: <a href="{{link.href}}">{{link.name}}</a>
{% endfor %}
"""
if __name__ == '__main__':
links = [
{'name': 'Google', 'href': 'https://www.google.com'},
{'name': 'Facebook', 'href': 'https://www.facebook.com'}
]
t = Template(tmpl)
sys.stdout.write(t.render(links=links))
Tested on: Ubuntu Linux 14.10, Go 1.4, Python 2.7.8, Jinja2 2.7.3
Golang html/template versus Python Jinja2 series:
[1]Golang html/template versus Python Jinja2 (1)[2]Golang html/template versus Python Jinja2 (2)[3]Golang html/template versus Python Jinja2 (3) - Arrays and Slices[4]Golang html/template versus Python Jinja2 (4) - Arrays and Slices Index[5]Golang html/template versus Python Jinja2 (5) - Maps and Dictionaries[6]Golang html/template versus Python Jinja2 (6) - Template Inheritance (Extends)[7]Golang html/template versus Python Jinja2 (7) - Custom Functions and FiltersReferences:
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