Jinja2模板没有正确渲染if-elif-else语句 [英] Jinja2 template not rendering if-elif-else statement properly

问题描述

我正在尝试使用jinja2模板中的css设置文本颜色。在下面的代码中，我想将输出字符串设置为以特定字体颜色打印（如果变量包含字符串）。每次生成模板虽然它由于else语句而以红色打印，但它永远不会看到前两个条件，即使输出应该匹配，我可以告诉变量的输出是什么，当表生成时它是如预期的那样。我知道我的css是正确的，因为默认情况下字符串打印为红色。

I am trying to set the text color using css in a jinja2 template. In the following code I want to set the output string to print in a specific font color if the variable contains a string. Everytime the template is generated though it prints in red due to the else statement, it never see the first two conditions even though the output should be matched, I can tell what the output from the variable is when the table generates and it is as expected. I know my css is correct due to the printing of the string in red by default.

我的第一个想法是用引号括起我正在检查的字符串但是没有不行。接下来是jinja没有扩展 RepoOutput [RepoName.index（repo）] 但是它上面的for循环工作， RepoName 正确扩展。我知道如果我添加括号，它将打印变量，我相当肯定会破坏模板或只是不工作。

My first thought was to enclose the string I was checking for in quotes but that didn't work. Next was that jinja was not expanding RepoOutput[RepoName.index(repo)] but the for loop above it works, RepoName is expanded upon properly. I know if I add the braces it will print the variable which I am fairly certain will either break the template or just not work.

我试着查看这些网站然后去了通过全局表达式列表，但找不到类似于我的任何示例或者进一步查看的方向。

I tried looking at these sites and went through the list of global expressions as well but couldn't find any examples similar to mine or a direction in which to look further.

http://jinja.pocoo.org/docs/templates/#if

http://wsgiarea.pocoo.org/jinja/docs/conditions。 html

   {% for repo in RepoName %}
       <tr>
          <td> <a href="http://mongit201.be.monster.com/icinga/{{ repo }}">{{ repo }}</a> </td>
       {% if error in RepoOutput[RepoName.index(repo)] %}
          <td id=error> {{ RepoOutput[RepoName.index(repo)] }} </td> <!-- I want this in green if it is up-to-date, otherwise I want it in red -->
       {% elif Already in RepoOutput[RepoName.index(repo) %}
          <td id=good> {{ RepoOutput[RepoName.index(repo)] }} </td>   <!-- I want this in green if it is up-to-date, otherwise I want it in red -->
       {% else %}
            <td id=error> {{ RepoOutput[RepoName.index(repo)] }} </td> <!-- I want this in green if it is up-to-date, otherwise I want it in red -->
       </tr>

       {% endif %}
   {% endfor %}

谢谢

推荐答案

您正在测试变量的值 错误和 已经存在于 RepoOutput [RepoName.index（repo）] 中。如果这些变量不存在，则使用未定义的对象。

You are testing if the values of the variables error and Already are present in RepoOutput[RepoName.index(repo)]. If these variables don't exist then an undefined object is used.

你的如果和 elif 测试都是假的; RepoOutput [RepoName.index（repo）]的值中没有未定义的对象。

Both of your if and elif tests therefore are false; there is no undefined object in the value of RepoOutput[RepoName.index(repo)].

我想你想测试某些字符串取而代之的是：

I think you wanted to test if certain strings are in the value instead:

{% if "error" in RepoOutput[RepoName.index(repo)] %}
    <td id="error"> {{ RepoOutput[RepoName.index(repo)] }} </td>
{% elif "Already" in RepoOutput[RepoName.index(repo) %}
    <td id="good"> {{ RepoOutput[RepoName.index(repo)] }} </td>
{% else %}
    <td id="error"> {{ RepoOutput[RepoName.index(repo)] }} </td>
{% endif %}
</tr>

我做的其他更正：

• 使用 {％elif ...％} 而不是 {$ elif ...％} 。


• 将< / tr> 标记移出，如果条件结构，它必须始终存在。


• 在 id 属性周围加上引号

• Used {% elif ... %} instead of {$ elif ... %}.
• moved the </tr> tag out of the if conditional structure, it needs to be there always.
• put quotes around the id attribute

请注意，您很可能在此处使用 class 属性，而不是 id ，后者必须具有在HTML文档中必须唯一的值。

Note that most likely you want to use a class attribute instead here, not an id, the latter must have a value that must be unique across your HTML document.

就我个人而言在这里设置类值并减少重复：

Personally, I'd set the class value here and reduce the duplication a little:

{% if "Already" in RepoOutput[RepoName.index(repo)] %}
    {% set row_class = "good" %}
{% else %}
    {% set row_class = "error" %}
{% endif %}
<td class="{{ row_class }}"> {{ RepoOutput[RepoName.index(repo)] }} </td>

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