how do i use jinja if else control statements?

jinja if else control statements are used to manipulate template sections and variables in the Jinja2 template engine. These statements allow developers to control whether data should be rendered, configured, or both depending on certain criteria. By using these statements, developers can confidently create templates that output components the way they want them. This article will discuss how to use these control statements for basic if else logic within a template.

It's important to first understand how the syntax for a Jinja if else statement works in order for it to be used effectively. The syntax consists of two parts: an expression and a block of code that runs if the result of the expression is true. It looks like this:

{% if expression %}

{# code to run #}

{% else %}

{# alt code to run #}

{% endif %}.

In this example, when the "if" part evaluates as true, then the code in between it and "else" will be executed; otherwise, this alternate block of code between "else" and "endif" will be executed instead. Additionally, when creating multiple conditions within an if statement, an optional elif (used in place of else if) argument may also be used like so:

{% if expression1 %}

{# code 1 #}

{% elif expression2 %}

{# alt code 2 #}

{% endif %}.

This allows developers to stack multiple tests with explicit outcomes so that whatever meets criteria executes accordingly. If none of the expressions are met then nothing will run when this section attempts execution; consequently, putting return {} at the end of everything helps ensure something is always returned even if nothing is set deterministically within the conditions. Upon understanding this structure, one may now begin using their own logic within such a statement:

{% if customer == "premium" %}

...

{# Premium styling #} {% elif customer == "standard" %}

...

{# Standard styling #}{% endif %}.

In this scenario, users with premium status running through this template section would skew its "customer" value via parameter passing or context dictionary push accordingly then see something that others don't -- a premium background image rendered along with other design enhancements exclusive to them, perhaps even being pushed further down depending on what follows all these scope terminations thereafter since Jinja can only take you so far without production support after defining variables & conditionals solely in templates themselves! Of course afterwards fallbacks must still exist when overriding something beyond content length restrictions due purely lacking production help executing templates as expected before deploying site wide out into real world applications serving users daily too despite complexity incurred while developing them sorely taxing content teams budgets & timelines alike while doing their best under such strain workloads taking today's projects spinning numerous circles yearly including ongoing management of layered escalations regularly seen arising unexpectedly without warning often enough apparently..! To that end allowing customers varying user experiences even differing ones granted collaboratively which were never heretofore possible capably measured along same ruler scale obviously near impossible formerly now finally here helping everyone work simpler smarter no doubt beneficial many out long struggling endlessly uptil success seemingly found due sustaining wins ultimately gained newfound thanks sheer re-purposing power unlocked adoption technology largely unexploited widespread purging redundant old solutions costing too much dragging everyone repeatedly back loss less real effectiveness alongside...or bigger picture enabled something far greater at say enterprise level releasing ground-breaking continuous delivery via automation then allowing scaling personnel resources organisation b**yond internal organisations own currently capacities internscale undeniably unprecedented ways things rapidly being industry setting standards deployment through massive improvements agility services products raising bar benchmarks performance 'on demand' broadly everywhere..!

Put simply by leveraging jinja's control structures against specific data points acquired prior executing content within actual environments able swiftly adjust accordingly various structural anomalies seen normalising whatever get ready very quickly handle whatever task ask implementing loop operations many times saving hefty sums not need extra throttling just dynamically replace scenes & functions using such cost effective approaches cheaply robustly sufficiently static instances require solid back up systems developed pushing ever forward towards tomorrow pioneering new ways harnessing machine intelligence back current our frontiers it discover unlock secrets have yet dreamed often staggering possibilities find realistically process voluminous quantities data generated tremendous speed insight daily exponentially growing datasets fed prime generation cutting edge algorithms coaxed inform decisions route come unmatched replicability incredibly powerful tools aid decision makers every realm scenarios quickly bringing unfathomable hitherto times concept thought processing instantaneously become reality potential energising blazing trails