Search code examples
pythonhtmlhttp-redirectjinja2fastapi

How to redirect the user to another webpage without using JavaScript in a Jinja2 HTML template?

I'm using a Jinja2 Template with FastAPI. All I want to know is how to implement a redirect action in Jinja2 template without using JavaScrpit?

If the variable I set exists, I would like to force a page redirection.

{% if my_var %}
    // What value should I enter here?
{% endif %}

Case in my titles with java :

<c:if test="${!emtpy(my_var)}">  
    <% response.sendRedirect("/new/url"); %>
</c:if>

Case in my PHP :

if(!empty($my_var) ){
    header('Location:/new/url');
    exit;  
}

If there is no way, I have to use JavaScript, but I don't want to use this method at all, as some of people deactivate JavaScript in their browsers.

Solution

  • Since you wouldn't like to use JavaScript, you may use a <meta> HTML element/tag with the http-equiv attribute set to refresh. This instruction specifies:

    The number of seconds until the page should redirect to another - only if the content attribute contains a non-negative integer followed by the string ';url=', and a valid URL.

    Hence, the value in the content is the delay before the browser redirects the user to the new page. To redirect immediately, set this parameter to 0 seconds, as shown in the example below.

    The <meta> tag should be placed inside a <head> element; however, in HTML 5 it is permitted to use <meta> tags inside a <body> tag as well, as long as there is an itemprop attribute present.

    Example

    <head>
     {% if my_var %}
        <meta http-equiv="refresh" content="0; url='https://stackoverflow.com'" />
     {% endif %}
</head>