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Already on GitHub? Sign in to your account. Chipping in with some more details. This is what the code above looks like to get a feeling for what's happening inside:. We have the same problem as DriverX. Yes, the use of "set" is documented, but, is it working? We use optional third-party analytics cookies to understand how you use GitHub. Learn more. You can always update your selection by clicking Cookie Preferences at the bottom of the page.

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Please make a method of assigning a global variable.Warning: This is an old version. The latest stable version is Version 2. This document describes the syntax and semantics of the template engine and will be most useful as reference to those creating Jinja templates. As the template engine is very flexible, the configuration from the application can be slightly different from the code presented here in terms of delimiters and behavior of undefined values.

A Jinja template is simply a text file. The template syntax is heavily inspired by Django and Python. Below is a minimal template that illustrates a few basics using the default Jinja configuration. We will cover the details later in this document:. The following example shows the default configuration settings.

You can mess around with the variables in templates provided they are passed in by the application. Variables may have attributes or elements on them you can access too. What attributes a variable has depends heavily on the application providing that variable. You can use a dot.

SaltStack: Setting a jinja2 variable from an inner block scope

If a variable or attribute does not exist, you will get back an undefined value. What you can do with that kind of value depends on the application configuration: the default behavior is to evaluate to an empty string if printed or iterated over, and to fail for every other operation. For the sake of convenience, foo. This is important if an object has an item and attribute with the same name.

Additionally, the attr filter only looks up attributes. Variables can be modified by filters. Filters are separated from the variable by a pipe symbol and may have optional arguments in parentheses. Multiple filters can be chained. The output of one filter is applied to the next. Filters that accept arguments have parentheses around the arguments, just like a function call.

The List of Builtin Filters below describes all the builtin filters. Tests can be used to test a variable against a common expression. To test a variable or expression, you add is plus the name of the test after the variable.

For example, to find out if a variable is defined, you can do name is definedwhich will then return true or false depending on whether name is defined in the current template context. Tests can accept arguments, too. If the test only takes one argument, you can leave out the parentheses.

For example, the following two expressions do the same thing:. The List of Builtin Tests below describes all the builtin tests. This is useful to comment out parts of the template for debugging or to add information for other template designers or yourself:.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project?

Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I'm using Ansible 2. Here is a more "complete" run to show the failure and success in 2.

I cannot reproduce this at all in Jinja2. Added this regression test in 3ec but it passes. There must be more to this story. This looks a lot like something that could be done much cleaner with the batch filter. Also, check out the various attributes exposed on the loop object.

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Variables cannot be set in loops and that is intentional. It was never documented that you can override variables from higher scopes and that was considered a bug. See also Maybe it'd be worth raising an exception when trying to do this in a way that worked in 2.

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We use optional third-party analytics cookies to understand how you use GitHub. Learn more. You can always update your selection by clicking Cookie Preferences at the bottom of the page. For more information, see our Privacy Statement. We use essential cookies to perform essential website functions, e. We use analytics cookies to understand how you use our websites so we can make them better, e.

Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Jinja2 2. Copy link Quote reply. Added a test for an assumed regression refs I have the same bug.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

If you want to isolate certain parts of your HTML using session you can call the session directly on those elements:. However the other example, in the Python code, would actually overwrite the value of session['username'] with the string 'username'due to variable assignment. If you were trying to set a variable to the value of session['username'] you would use:. Otherwise if you just needed to test or use the value for some other reason you can access it directly for example:.

Hopefully that helps for anyone new to Flask or Jinja2 that might wonder why their session variables are being overwritten. Learn more. How to access session variables in jinja 2 - Flask Ask Question.

Asked 3 years, 8 months ago. Active 6 months ago. Viewed 24k times. Active Oldest Votes. The flask tutorial shows the use of dot notation e. Reference: flask. Sign up or log in Sign up using Google. Sign up using Facebook.

jinja2 set session variable

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I'm running the micro framework Bottle on Google App Engine. I'm using Jinja2 for my templates. And I'm using Beaker to handle the sessions. I'm still a pretty big Python newbie and am pretty stoked I got this far : My question is how do I access the session data within the templates? I can get the session data no problem within the actual python code.

And I could pass the session data each time I call a jinja template. But since I need the session data in the main menu bar of the site Does anyone know if I can access it directly in the templates? You can add things to the Jinja2 environment globals if you want them to be accessible to all templates.

jinja2 set session variable

See this page for additional information. Learn more.

Jinja2 Templating Engine Tutorial

How do I access session data in Jinja2 templates Bottle framework on app engine? Ask Question. Asked 10 years, 6 months ago. Active 10 years, 6 months ago. Viewed 8k times. Chris McCall 9, 8 8 gold badges 44 44 silver badges 77 77 bronze badges. TylerW TylerW 1, 2 2 gold badges 10 10 silver badges 25 25 bronze badges. Active Oldest Votes.

Vinay Sajip Vinay Sajip I'm having some trouble finding some examples. Can you tell me how I would set the global variable? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I tried the following but nothing worked. This is not possible, and reflects a deep problem in your understanding of the web application architecture. JavaScript you are talking about is running in your browser. When a server receives a request, it processes a jinja2 template to obtain the response it will send to the client.

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You cannot "set Jinja variable to js variable", you can render the page in such a way that eventually a JavaScript variable would be assigned a value that was in a Jinja2 variable. In order to send the value 42 to Python and possibly later to jinja2you would need to make a request that would send that value from client to server: a form submission, or an AJAX request.

You might get a better response if you would describe exactly what you want to do that you think requires you to "set javascript value to jinja variable". Python is the language of your server, which will create the HTML sent to your clients. Jinja2 is a templating engine for Python, which makes it easy to generate HTML without writing it directly. JavaScript is your frontend scripting language, running on the client's browser once the HTML has been generated and served.

The reason you can't use Javascript to "set a Jinja2 variable" is because there are no Jinja2 variables in the rendered HTML sent to the client. Perhaps what you want to do though, is use frontend elements to change values that were initially set by python and Jinja2 on the backend.

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To do this, you will need to have your JavaScript send information back to the server, so the server can use this information to rerender the page, possibly inserting new values into your templates using Jinja2 in the process. Consider simply linking to a URL with the parameter you want to set. You could link to www. Learn more. How to set javascript value to jinja variable Ask Question. Asked 3 years, 6 months ago. Active 5 months ago.

Viewed 12k times. I know we can set Jinja variable to js variable like this. Active Oldest Votes. Amadan Amadan k 18 18 gold badges silver badges bronze badges. The way you're describing, it can't be done. Swordopolis Swordopolis 19 2 2 bronze badges. Sign up or log in Sign up using Google.Even though it isn't a programming language, Jinja also has a specific set of words that you need to use in order to write a 'code' in it.

Together, they are called the syntax and are governed by a set of simple rules that allow you to tell the computer what you need to achieve in a language comprehensible to it. You will be mostly writing your Jinja templates directly in the Exponea.

However, in general, you can write Jinja templates into a simple text file. Because Jinja codes are usually inserted into other types of code, such as Html in emails, the difference between the Jinja code and the other parts need to be clearly distinguished.

In Jinja, you will use delimiters to signify that this particular part of code is relevant for the parser. Another basic feature of Jinja is variables. Sometimes, you need the computer to remember some values while rendering your template. In order to do so, you can create a variable, that will store the value for you. A variable always has a name, by which it can be referred to during the rendering, and it also has a type.

However, you do not need to worry about types, for now. Jinja automatically sets them up for you when you initialize a variable. Make sure that you give your variables relevant names. It will make your code more readable and it will also help you eliminate errors. For instance, you can call a variable storing a number xor a variable storing some customer's name, customerName.

Before you can use your variable, it first needs to be initialized. You can do this by using the set command. However, you always need to initialize your variables with value. Then you will be able to use the variable throughout your code by simply typing the variables name. Make sure you always initialize your variables before using them, otherwise, the parser will not be able to understand what you are referring to by the variable name. Sometimes, you might be interested in the properties of some value of your variables.

For instance, you would like to know, how many letters does the name of your customer contain. In general, the properties of your customers can be accessed in two ways. First, they can be accessed by using the box brackets.

You can also access the properties using the dot notation variable. To avoid unnecessary bugs, you should stick to the box bracket notation. Although generally, the two should be equivalent, there are some known cases where using the variable. This is because of their underlying implementation in Python.

For a technical explanation of the differences check out this official Jinja reference. When setting out strings, you have to tell the renderer that it is a value of type string, not statements of Jinja. You do this by enclosing the string in either single quotations 'Example' or double quotations "Example".

jinja2 set session variable

List Mutable array, defined with square brackets [ ] Can contain any data types E. Tuple Like list, but immutable, cannot be changed once defined. Defined with parenthesis Can contain any type E. Dictionary Object containing "key: value" pairs.

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