Django 变量未显示答案

【问题标题】：Django Variable not getting showedDjango 变量未显示
【发布时间】：2021-03-07 10:01:42
【问题描述】：

我已经开始了我的 Djnago 之旅，我正在尝试在 html 文件中打印一个定义的变量但没有得到任何东西，请告诉我代码有什么问题

我的views.py，查看我尝试发布数据的最后一种方法

from django.shortcuts import render
from django.http import HttpResponse, JsonResponse


# Create your views here.


def bootstrappage(request):
    return render(request, 'index.html')


def secondpage(request):
    return render(request, 'common.html')


def thirdpage(request):
    var = 'this is my first variable'
    mydictionary = {
        "first": var,
        'two':"data of two"
    }
    print(mydictionary["first"])
    return render(request, 'third.html', context=mydictionary)

我试图在其中打印变量的third.html 文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
</head>
<body>
{% extends 'index.html' %}

{% block title %}Third page{% endblock %}
{% block name %}Viewing Third page!{% endblock %}
{{first}}
{{two}}


</body>
</html>

index.html 文件，取自官方引导站点，导航栏基本代码。

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">

    <title>{% block title %}bootstrap{% endblock %}</title>
  </head>
  <body>


    <nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

    <h1>{% block name %}Tiwariji!{% endblock %}</h1>
    <!-- Optional JavaScript; choose one of the two! -->

    <!-- Option 1: jQuery and Bootstrap Bundle (includes Popper) -->
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script>

    <!-- Option 2: jQuery, Popper.js, and Bootstrap JS
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.min.js" integrity="sha384-w1Q4orYjBQndcko6MimVbzY0tgp4pWB4lZ7lr30WKz0vr/aWKhXdBNmNb5D92v7s" crossorigin="anonymous"></script>
    -->
  </body>
</html>

【问题讨论】：

标签： html python-3.x django django-views django-templates

【解决方案1】：

您需要将{% block content %} {{ first }} {% endblock %} 添加到您的third.html。在您的 index.html 中，您还必须输入：{% block content %} {% endblock %} 以从 third.html 获取内容。所以和你的标题完全一样。查看 Django 模板语言的文档here

【讨论】：

谢谢！！能够打印变量。但我不明白为什么我需要在 index.html 中使用 {% block content %} {% endblock %} ？我在这里尝试的是从 index.html 和其他我试图在 Third.html 中定义的特定页面的东西获取导航栏。
太棒了！这是因为模板继承。基本上这意味着您不必重复自己的代码，例如导航栏/页脚。所以你可以把 {%block content %}{% endblock %} 放在你的导航栏下。这样 django 只需渲染您的内容，而不是再次渲染整个页面，包括导航栏/页脚等。结帐：docs.djangoproject.com/en/3.1/ref/templates/language/… 了解更多信息。