#params

Angular Routing: Everything you need to know by Abdelfattah Ragab

Welcome to the book “Angular Routing: Everything you need to know”. In this book, I explain everything you need to know about Angular routing. Routing helps you to change what the user sees in a single-page app. In this book, you will learn how to implement common routing tasks. You will learn how to set up routes, retrieve route information, display 404 pages, prevent unauthorized access, and much more. By the end of this book, you will be confident working with routing in your Angular application and be able to handle all kinds of scenarios. Let us get started.

Available on https://shop.tredition.com and https://www.amazon.com

Welcome to the book “Angular Routing”. In this book, I explain everything you need to know about Angular routing. Routing helps you to change what the user sees in a single-page app. In this book, you will learn how to implement common routing tasks. You will learn how to set up routes, retrieve route information, display 404 pages, prevent unauthorized access, and much more. By the end of this book, you will be confident working with routing in your Angular application and be able to handle all kinds of scenarios. Let us get started.

#angularrouting #guards #resolvers #canActivate #pathmatch #params #queryparams #nestedroutes #scrollpositionrestration #routerevents #routertracing

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Some times we need to extract some data or get the specific key data from URL. In order to achieve that we need to break the whole url string in “&” and we have to store data as  array in a variable. After that we have to make search so doing this , is taking more time and more complexity. The post will show a simple and easy way to Make Query URL using swift 3. (more…)

I was just working on an API route that ought allow updating several different records using the same (mostly, and they can be null if not necessary) params for each record. It's essential that the route handle updating a variable number of records at once--from 1 to... infinity and beyond! I was trying to figure out how to structure the JSON params for such a route.

At first I thought it would be cool to have top-level keys (record ID) pointing to the params for that particular record--nested objects, like so:

{ "id1": { "key1":"value1", "key2":"value2" }, "id2": { "key1":"value1", "key2":"value2" } }

I investigated how to accomplish this with Web API, using the [FromBody] param parsing. I tried to make a class that would have a Dictionary property, but this dead-ended quickly. Some slight googling yielded the JObject class. This was cool, in that now I was able to pass in an arbitrary JSON object to my API route. But now I had to write parsing logic to extract the proper data structures out of this JObject, and this wasn't so straightforward. It's certainly doable:

foreach (KeyValuePair<string, JToken> data in _params) { // do stuff with data.Key; // do stuff with data.Value; }

But then I'd need to manually instantiate the individual params objects, and this is far less fun than having Web API do it all automagically.

So I re-thought my approach! "Wait a second," I thought. "Couldn't the id attribute be just another key/value pair in each object? And isn't an array of objects a perfectly valid JSON object?" It sure can, and it sure is! So I restructured my JSON params to look like this:

[ { "id":"id1", "key1":"value1", "key2":"value2" }, { "id":"id2", "key1":"value1", "key2":"value2" } ]

Firstly, params is really not a thing!

Params is a hash like Rails object created by ActionController::Parameters. The source code of module Parameters is here. Params is just a fussy way that rails is trying to make our life easier (yet seems it’s making some new comers struggled..)

Information is passed around as http requests and server response. Every request would have a header, a body and url. Params can be passed by the url and body. One thing to keep in mind is GET request does not have a body.

Params is really just a fancy way to strip the useless information and format the useful ones. For example, in a get request as below.

get ‘posts/3′

The only params that will be extracted is going to be { :id => 3 }. Since a get request do not have a body, url is the only way to pass params to the server.

However, in post/patch/put/delete requests, information can be passed through the request body. That’s how form information are sent to the server. Consider this request

post ‘posts/3′

By just looking at the url is not going to show us a full picture. In the html form, we will have title and body. So the params will look something like this

{ :post => { :title => ‘A blog post’, :body => ‘a blog post body’ } }

Indeed, the params will also contain information of the authenticity_token if you have forgery_protection set as true.

All the information in the params hash are just extracted from the gabligoob from the http request. You can find the original request by inspecting elements on your browser. It might look some sort of nonsense to you though.

What the params keys and values are is entirely set by us. Consider this simple form below.

<form action=<%= posts_url %> method=“post”>   <input type=“text” name=“post[title]”>   <input type=“text” name=“post[body]”>   <input type=“submit”> </form>

The bolded part is where we specify the keys of the params, which can totally be customized. Whatever you name it, it will show up as the key in the params.