javascript占位符的转义Jinja模板 [英] Escaping jinja template for javascript place holder

问题描述

我想将JavaScript变量${channels[i]}传递给我的jinja2模板，作为链接标签的href属性的占位符.

I want to pass a javascript variable ${channels[i]} to my jinja2 template as a placeholder for the href attribute of the link tag.

我尝试了{% raw %}{% endraw %} 标记到转义" html实体，但是jinja2似乎抛出异常，因为%是一个无法识别的字符.

I have tried {% raw %}{% endraw %} tags to escape " html entity but it seems that the jinja2 throws an exception as % is an unidentified character.

在下面查看我的代码:

for(i=0; i<=channels.length-1; i++) {
  console.log(channels[i])
  const li = document.createElement("li");

  li.innerHTML = `<a href="{{ url_for('channel', channel_name = ${channels[i]}) }}" >${channels[i]}</a>`;

  ul.append(li);
}

任何帮助或其他任何完成任务的方法将不胜感激

any help or any other method to accomplish the task would be much appreciated

推荐答案

您正在混合东西，无法在jinja2表达式{{ .. }}中评估javascript变量.

you are mixing things, you can't evaluate javascript variables in jinja2 expression {{ .. }}.

jinja2在服务器端上呈现您的模板，并将HTML输出提供给客户端(浏览器)，而javascipt(您的代码) )在客户端(浏览器)上操作接收到的HTML的DOM.那么他们如何互相交谈呢? 您有3个选择:

jinja2 renders your template on the server-side and the HTML output is served to the client-side (the browser), whereas the javascipt (your code) manipulates the DOM of the received HTML on the client-side (the browser). so how they would talk to each other ? you have 3 options:

• 使用ajax执行http请求(而不是您的情况)
• 查看代码并将逻辑移至jinja2(强烈建议)
• 或尝试使用此技巧:

• using ajax to perform http requests (not your case)
• reviewing the code and moving the logic to jinja2 (strongly recommended)
• or trying this hack:

[..]

  let href = "{{ url_for('channel', channel_name='CHANNEL_NAME'} }}".replace("CHANNEL_NAME", ${channels[i])
  li.innerHTML = "<a href=" + href + ">${channels[i]}</a>";

[..]

请记住，jinja2将呈现您的模板并提供以下输出:

bear in mind that jinja2 will render your template and serve this output:

for(i=0; i<= channels.length-1; i++) {
  console.log(channels[i])
  const li = document.createElement("li");
  
  let href = "http://localhost:5000/channel/CHANNEL_NAME".replace("CHANNEL_NAME", ${channels[i])
  li.innerHTML = "<a href=" + href + ">${channels[i]}</a>";
  
  ul.append(li);
};

，并且一旦被客户端接收，就可以执行javascript代码，然后使用值${channels[i]}

and once received by the client, the javascript code can be executed and then process the replacement of the CHANNEL_NAME token with the value of ${channels[i]}

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