在django模板中获取模板语法错误

问题描述

我的代码视图：

  tracks = client.get（'/ tracks'，order ='hotness' = 4）
 artwork_url = [] 
轨道轨道：
 artwork_url.append（str（track.artwork_url）.replace（large，t300x300））
 
 
 val = {tracks：tracks，artwork_url：artwork_url} 
返回render_to_response（'music / tracks.html'，val）
  

in .html

  {％for track在曲目％} 
< li> 
< div class =genre-image> 
< img src ={{artwork_url [forloop.counter]}}> 
< / div> 
 {％endfor％} 
  

错误：

 异常类型：TemplateSyntaxError 
异常值：无法解析余数：'[forloop.counter]'from'artwork_url [forloop.counter]'
  

解决方案

由于您的 artwork_url 是一个列表，合理的方法是这样访问它：

artwork_url.forloop.counter

但它不会工作。 Django模板语言不是不幸的是。

你应该这样访问。

  {％for tracks in tracks％} 
< li>< div class =genre-image> 
< img src ={{track.artwork_url}}> 
< / div> 
 {％endfor％} 
  

但是这要求曲目是可变的，需要你在后端更改它。

所以如果你无法修改曲目，你必须实现一个这样的自定义模板过滤器

{{track.artwork_url | myFormatter：'t300'}}

一个非常小而简单formatter：

  @ register.filter（name ='myDate'）
 def myFormatter（value，arg）：
如果arg =='t300'：
 arg ='t300x300'
 return str（value）.replace（large，arg）
  / pre> 
my code in view :
tracks = client.get('/tracks', order='hotness', limit=4)
artwork_url=[]
for track in tracks:
    artwork_url.append(str(track.artwork_url).replace("large", "t300x300"))


val={"tracks":tracks,"artwork_url":artwork_url}
return render_to_response('music/tracks.html',val)
in .html
{% for track in tracks %}
<li>
    <div class="genre-image">
        <img src="{{   artwork_url[forloop.counter] }}">
    </div>
{% endfor %}
Error:
Exception Type: TemplateSyntaxError
Exception Value:  Could not parse the remainder: '[forloop.counter]' from 'artwork_url[forloop.counter]'
 解决方案 
Since your artwork_url is a list, the reasonable way would be to access it like this:
artwork_url.forloop.counter
but it won't work. The Django template language isn't that advanced unfortunately.
You should access it like this.
{% for track in tracks %}
<li><div class="genre-image">
<img src="{{ track.artwork_url }}">
</div>
{% endfor %}
But that requires that the tracks are mutable and require you to change it in the backend. 
So if you're not able to modify the track you'd have to implement a custom template filter something like this 
{{ track.artwork_url|myFormatter:'t300' }}
A very small and simple formatter:
@register.filter(name='myDate')
def myFormatter(value, arg):
    if arg == 't300':
        arg = 't300x300'
    return str(value).replace("large", arg)
                        
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