Ng Template Context

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Dotshave a special meaning in template rendering. A dot in a variable namesignifies a lookup. Specifically, when the template system encounters adot in a variable name, it tries the following lookups, in this order:

Filters that are applied to an invalid variable will only be applied ifstring_if_invalid is set to '' (the empty string). Ifstring_if_invalid is set to any other value, variable filters will beignored.

This behavior is slightly different for the if, for and regrouptemplate tags. If an invalid variable is provided to one of these templatetags, the variable will be interpreted as None. Filters are alwaysapplied to invalid variables within these template tags.

In addition to push() and pop(), the Contextobject also defines an update() method. This works like push()but takes a dictionary as an argument and pushes that dictionary ontothe stack instead of an empty one.

Django comes with a special Context class,django.template.RequestContext, that acts slightly differently from thenormal django.template.Context. The first difference is that it takes anHttpRequest as its first argument. For example:

In addition to these, RequestContext always enables'django.template.context_processors.csrf'. This is a security relatedcontext processor required by the admin and other contrib apps, and, in caseof accidental misconfiguration, it is deliberately hardcoded in and cannot beturned off in the context_processors option.

Each processor is applied in order. That means, if one processor adds avariable to the context and a second processor adds a variable with the samename, the second will override the first. The default processors are explainedbelow.

Your templates can go anywhere you want, as long as the directories andtemplates are readable by the web server. They can have any extension you want,such as .html or .txt, or they can have no extension at all.

Some of these other loaders are disabled by default, but you can activate themby adding a 'loaders' option to your DjangoTemplates backend in theTEMPLATES setting or passing a loaders argument toEngine. loaders should be a list of strings ortuples, where each represents a template loader class. Here are the templateloaders that come with Django:

For example, the filesystem loader may receive 'index.html' as atemplate_name argument. This method would yield origins for thefull path of index.html as it appears in each template directorythe loader looks at.

Returns a Template object for a given template_name by loopingthrough results from get_template_sources() and callingget_contents(). This returns the first matching template. If notemplate is found, TemplateDoesNotExist israised.

I had some confusion regarding ngTemplateOutletContext , specifically how it is passed to ngTemplate or who passes it to ngTemplate which surrounds the element on which *ngFor was applied. The confusion builds up when I compare it to the way, when we explicitly pass which ngTemplate to render.

Say we have an ngContainer / ngTemplate / ( Literally any HTML element as ngTemplateOutlet & ngTemplateOutletContext can be applied to any element), Now we chose to explicitly provide a template which we have created earlier. Like this -

1.) Who provides the values ( context ) to this de-sugared ng-template so that it is able to bind let-number to the $implicit properties. I looked into ngForOfContext , there I found that some variable are provided that's why we are able bind variable like even, index like -

But if use the de-sugared syntax with the ngForTemplate input we have to declare a 2nd ng-template element. Because if we try to apply the ngFor directive without the * on anything else than an ng-template we get an error.

I am working on a small intranet site for a small company, where user should be able to post. I have imagined a very simple authentication mechanism where people just enter their email address, and gets sent a unique login url, that sets a cookie that will always identify them for future requests.

In my template setup, I have base.html, and the other pages extend this. I want to show logged in or register button in the base.html, but how can I ensure that the necessary variables are always a part of the context? It seems that each view just sets up the context as they like, and there is no global context population. Is there a way of doing this without including the user in each context creation?

There is no need to write a context processor for the user object if you already have the "django.core.context_processors.auth" in TEMPLATE_CONTEXT_PROCESSORS and if you're using RequestContext in your views.

A context processor has a very simple interface: It's just a Python function that takes one argument, an HttpRequest object, and returns a dictionary that gets added to the template context. Each context processor must return a dictionary.

its possible by default, by doing the following steps, ensure you have added the context 'django.contrib.auth.context_processors.auth' in your settings. By default its added in settings.py, so its looks like this

@marcgibbons I agree this context processor is a bit weird. Requiring both the DEBUG setting and INTERNAL_IPS is a strange combination, since Django recommends DEBUG never be used in production anyway. The same logic was copied in django-debug-toolbar

These directives are frequently used with ng-container, and because these directives are designed to be used together, it will help if we learn them all in one go, as we will have more context around each directive.

Like the name indicates, the ng-template directive represents an Angular template: this means that the content of this tag will contain part of a template, that can be then be composed together with other templates in order to form the final component template.

We could add as many ngTemplateOutlet tags to the page as we would like, and instantiate a number of different templates. The value passed to this directive can be any expression that evaluates into a template reference, more on this later.

An example of why we would want to do that is to create a more customizable component, where can pass to it not only a configuration parameter or configuration object: we can also pass a template as an input parameter.

The end result of this design is that the tab container will display a default look and feel for the tab buttons if no custom template is provided, but it will use the custom template if its available.

This post is the first part of a two-parts step-by-step guide for implementing JWT-based Authentication in an Angular application (also applicable to enterprise applications).The goal in this post is to first start by learning how JSON Web Tokens (or JWTs) work in detail,

This post will be a quick practical guide for the Angular HTTP Client module. We will cover how to do HTTP in Angular in general. We will be using the new @angular/common/http module, but a good part of this post is also

My app creates html to go into the services block. What I want to do is make available to the aboutus block a value that is currently available in the services block. The aboutus template cut down looks like:

Any other way to get that data without having to wrap my template content? If I call Blaze.getView on event.currentTarget I have to get to the parent, but the number of levels I have to go up will differ throughout the app.

Thanks for feedback! The problem is that the template passed onto my event handler is the main parent (body element). It is not the template that contains my data, thus I would still have to look for the child template by name.

Though low level API with direct access to a Template instance would be really great instead of having to loop through parents in search for template instance with specified field (via Blaze.TemplateInstance.prototype.get from that package).

AWS AppSync defines a set of variables and functions for working with resolver mapping templates. This makes logical operations on data easier with GraphQL. This document describes those functions and provides examples for working with templates.

If you're trying to access a dictionary/map entry (such as an entry in context) by its key to retrieve the value, the Velocity Template Language (VTL) lets you directly use the notation .. However, this might not work for all cases, such as when the key names have special characters (for example, an underscore "_"). We recommend that you always use .get("") notation.

The stash is a map that is made available inside each resolver and function mapping template. The same stash instance lives through a single resolver execution. This means that you can use the stash to pass arbitrary data across request and response mapping templates, and across functions in a pipeline resolver. The stash exposes the same methods as the Java Map data structure.

If the previous operation was the pipeline resolver's Before mapping template, then $ctx.prev.result represents the output of the evaluation of the template and is made available to the first function in the pipeline.

The source IP address of the caller that AWS AppSync receives. If the request doesn't include the x-forwarded-for header, the source IP value contains only a single IP address from the TCP connection. If the request includes a x-forwarded-for header, the source IP is a list of IP addresses from the x-forwarded-for header, in addition to the IP address from the TCP connection.

The user name of the authenticated user. In the case of AMAZON_COGNITO_USER_POOLS authorization, the value of username is the value of attribute cognito:username. In the case of AWS_IAM authorization, the value of username is the value of the AWS user principal. If you're using IAM authorization with credentials vended from Amazon Cognito identity pools, we recommend that you use cognitoIdentityId.

AWS AppSync supports passing custom headers from clients and accessing them in your GraphQL resolvers by using $context.request.headers. You can then use the header values for actions such as inserting data into a data source or authorization checks. You can use single or multiple request headers using $curl with an API key from the command line, as shown in the following examples:

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