我的 django 模板布尔变量在 javascript 中没有按预期工作
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/12395579/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
My django template boolean variable isn't working as expected in javascript
提问by Lucas Ou-Yang
Here is the code in my base.html header
这是我的 base.html 标头中的代码
<script>
var auth_status = "{{ user.is_authenticated }}"
</script>
{% block scripts %} {% endblock %}
The rest of the scripts in my site are in the block scripts.
我网站中的其余脚本都在块脚本中。
In a child template (within the script block and within script tags) I have this code,
在子模板中（在脚本块内和脚本标签内）我有这个代码，
if (auth_status) {
//something
}
The error at hand is auth_status is always True, when it should be on and off depending on if the user is logged in. Request_context is being passed to the template so that should not be the error.
手头的错误是 auth_status 总是 True，什么时候应该打开和关闭取决于用户是否登录。 Request_context 被传递给模板，所以不应该是错误。
Thanks
谢谢
回答by Poli
For what I see your auth_statusvariable seems to be a string, not a boolean. A variable with a non-empty string on javascript will evaluate to trueon an ifclause.
对于我所看到的，您的auth_status变量似乎是一个字符串，而不是一个布尔值。与JavaScript的一个非空字符串变量将计算为true上的if条款。
Anyhow, something like
无论如何，像
<script>
var auth_status = {{ user.is_authenticated }};
</script>
will not work because that will generate this HTML:
将不起作用，因为这将生成此 HTML：
<script>
var auth_status = True;
</script>
As Python's True boolean is uppercased.
因为 Python 的 True 布尔值是大写的。
This should do the translation from Python to Javascript:
这应该完成从 Python 到 Javascript 的转换：
<script>
var auth_status = {{ user.is_authenticated|yesno:"true,false" }};
</script>
Check yesno docs here: https://docs.djangoproject.com/en/dev/ref/templates/builtins/#yesno
在此处检查 yesno 文档：https://docs.djangoproject.com/en/dev/ref/templates/builtins/#yesno
回答by TheDavidFactor
Another option would be to use the jinja2 tojsonfilter:
另一种选择是使用 jinja2tojson过滤器：
<script>
let javascript_var = {{ python_var|tojson }};
</script>
You may also want to use the safefilter depending on what you're passing:
您可能还想safe根据传递的内容使用过滤器：
<script>
let javascript_var = {{ python_var|tojson|safe }};
</script>
