在django模板中高效地加载jquery和javascript文件 [英] efficiently loading jquery and javascript files in django templates

问题描述

在我的一个django项目中，我使用了大量的自定义jquery脚本和大量的开源jQuery插件。现在，如果我加载基本模板中的所有jquery脚本，我将在模板中加载大量未使用的JavaScript代码，这些代码不需要任何/某些已加载的jQuery文件，这将影响该页面的加载时间特别的模板。

In one of my django projects i am using lots of custom jquery scripts and lots of open source jquery plugins. Now if i load all the jquery scripts in my base template, I will be loading a lot of unused javascript code in the templates which do not require any/some of the jquery files that have been loaded which will affect the page load time of that particular template.

所以，我目前采取的方法是

So, The current approach i am taking is

• 加载基本模板中的基本jQuery脚本（每个模板需要的）基本jQuery脚本


• 在基本模板中为js定义一个块，并为每个templates.eg选择性地加载所需的javascripts {％block selective_js％} {％endblock selective_js％}

• Load the basic jquery scripts in the base template (ones that are required by each template)
• Define a block for js in the base template and selectively load needed javascripts for each templates.e.g {% block selective_js %}{% endblock selective_js %}

上述方法运行良好，但是我看到的唯一的问题是模板中有很多代码重复。例如：

The above approach works well, but the only problem I see is a lot of code repetition in the templates. Say for example:

• 我有以下javascript文件

• I have the following javascript files

<script type="text/javascript" src="{{ STATIC_URL }}js/jquery.1.js"></script>
<script type="text/javascript" src="{{ STATIC_URL }}js/jquery.2.js"></script>
<script type="text/javascript" src="{{ STATIC_URL }}js/jquery.3.js"></script>
<script type="text/javascript" src="{{ STATIC_URL }}js/jquery.4.js"></script>
<script type="text/javascript" src="{{ STATIC_URL }}js/jquery.5.js"></script>

现在在多个模板中，我需要所有上述的JavaScript文件，要初始化所提及的脚本中的一些方法。所以目前，我必须在所有模板中执行此操作：

Now in more than one templates, I need all the above mentioned javascript files included and also want to initialize some of the methods within the mentioned scripts. So currently, I have to do this in all the templates:

{% block selective_js %}

    <script type="text/javascript" src="{{ STATIC_URL }}js/jquery.1.js"></script>
    <script type="text/javascript" src="{{ STATIC_URL }}js/jquery.2.js"></script>
    <script type="text/javascript" src="{{ STATIC_URL }}js/jquery.3.js"></script>
    <script type="text/javascript" src="{{ STATIC_URL }}js/jquery.4.js"></script>
    <script type="text/javascript" src="{{ STATIC_URL }}js/jquery.5.js"></script>

    <!-- Initialize Methods -->
    <script type="text/javascript">
        $(document).ready(function() {
            $('some_element').initializeScript();
        });
    </script>

{% endblock selective_js %}

这意味着模板中有很多代码重复。

Which means there is a lot of code repetition within the templates.

如何防止重复的代码，而不必以有效的方式加载未使用的JavaScript代码？

How can I prevent repeating code without having to load unused javascript code in an efficient manner ?

推荐答案

在父模板中定义一个块其中包含您的默认JavaScript文件，然后根据需要扩展块：

Define a block in your parent template where you include your "default" JavaScript files and then extend the block as needed:

# base.html

{% block js %}
    <script src="{{ STATIC_URL }}js/jquery.1.js"></script>
    <script src="{{ STATIC_URL }}js/jquery.2.js"></script>
    <script src="{{ STATIC_URL }}js/jquery.3.js"></script>
    <script src="{{ STATIC_URL }}js/jquery.4.js"></script>
    <script src="{{ STATIC_URL }}js/jquery.5.js"></script>
{% endblock %}


# child.html

{% extends "base.html %}

{% block js %}
    {{ block.super }} {# includes previous content in block #}
    {# view-specific imports here #}
{% endblock %}

这样可以防止你的模板重复出现： https://docs.djangoproject.com/en/1.5/topics/templates/#template-继承了解更多有关模板和继承的信息。

This will prevent repetition in your templates. Check out: https://docs.djangoproject.com/en/1.5/topics/templates/#template-inheritance for more information about templates and inheritance.

您可以使用 django-compressor 组合和缩小CSS和JS导入，并缓存它们以实现高效加载。

You can use django-compressor to combine and minify CSS and JS imports and cache them for efficient loading.

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