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98-382 PDF DEMO:
QUESTION NO: 1
HOTSPOT
You are using JavaScript to create a function that calculates admission price.
The function must meet the following requirements:
* The function accepts the age of the customer as a parameter
* A customer who is less than 5 years old gets in free
* A customer who is 65 years old or older gets in free
* A customer who is 5 years old to 17 years old, pays $10 USD
* All other customers pay $20 USD
How should you complete the code? To answer, select the appropriate code segments in the answer area.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
References: https://www.w3schools.com/jsref/jsref_operators.asp
QUESTION NO: 2
HOTSPOT
You are designing a web page that contains a list of animals. The web page includes a script that outputs animals from a list.
You create the following HTML to test the script:
You need to create a function that will display the list of animals, including any formatting, in the div element.
How should you complete the code? To answer, select the appropriate code segments in the answer area.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
Box 1: getElementsByTagName('ul')
Box 2: getElementsByTagName('li')
Box 3: innerHTML
Box 4: innerText
References: https://www.w3schools.com/jsref/met_element_getelementsbytagname.asp
QUESTION NO: 3
HOTSPOT
Variable x has a value of 5. Variable y has a value of 7.
For each of the following expressions, select True if the statement evaluates to true.
Otherwise, select False.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
References: https://www.w3schools.com/js/js_comparisons.asp
QUESTION NO: 4
HOTSPOT
You are creating a JavaScript function that returns a date the specified number of months in the future of the current date.
The function must meet the following requirements:
* Accept a number that represents the number of months to add or subtract from the current date.
* Return the current data adjusted by the number of months passed into the function.
How should you complete the code? To answer, select the appropriate code segments in the answer area.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
References:
https://www.w3schools.com/js/js_dates.asp
https://www.w3schools.com/js/js_date_methods.asp
https://www.w3schools.com/jsref/jsref_setmonth.asp
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Updated: Oct 23, 2020
You can't do everything in Blazor with .NET alone. If you want to use a JS lib or get information from the browser, you need to use JSInterop. When you need to communicate between 2 system or subsystem, you often need to 'keep' a reference of something from the other side. For example when you call a 'create payment' API, there is a lot of chance that it'll send you a 'paymentId' so you can call other API with this ID and do action like 'refund' or 'cancel'. For in-memory application it's a bit cumbersome to do it with ID by hand, because :
- you have to maintain an in-memory map of the object you share with the other side
- those object will never be release from memory by GC
- you have to do it for every kind of interaction
How does the framework shares .NET instance with js ?
It's better to handle this kind of thing at the framework/infrastructure level so the developer experience is better. In Blazor there is already one mechanism like that : you can send to JS the reference of a .NET object, so you can call any method anotated with [JSInvokable] on this object. From the official documentation, you do it like this :
Razor file :
JS file
With this code, the 'test' variable will be 'Hello, Rémi'. How does it work ?
- DotNetObjectReference.Create instantiate a DotNetObjectReference with the given HelloHelper value.
- The JSRuntime (method 'TrackObjectReference') detects that one parameter is a DotNetObjectReference and store it on an internal dictionary if it's not already there, then increments an ID and send this id to javascript wrapped in a json object like this
Where '1' is the object id on the internal dictionary.
- We saw on the last blog post how JSInterop uses json reviver for changing value received from .NET runtime. Here it uses the same mechanism for changing the json value to an instance of a DotnetObject like that
- Then when the JS method receives an instance of a DotnetObject and calls 'invokeMethodAsync' it calls a method called 'invokeDotNetFromJS' on a JS interface called 'DotNetCallDispatche' which is defined by the Blazor js library here.
- This method accept 2 things as 2nd argument : an assembly name OR an object ID (value of field __dotNetObject) and the other arguments are the method name, call id (for managing async calls) and method parameters.
- Then with the help of 'bind_static_method' from the mono WASM runtime which browse the loaded assemblies, it finds a reference to the C# static method 'MonoWebAssemblyJSRuntime.BeginInvokeDotNet' and calls it (the method call itself is really complicated, it consist of playing with memory from the .NET runtime inside WebAssembly) with the assembly name or the object id, the method name and the method parameters.
- This method then checks if the parameter is a digit, if it's a digit then it's a ref to a js object (if it's not then it's an assembly name). Why do they do a hack like that you will ask yourself ? Well there is a limit in interop between monowasm and blazor to 4 parameter, so they chose to send 2 distinct information into 1 slot. This limit does not apply to your code as every js interop call go through this wrapper.
- Then with reflection the C# class called DotNetDispatcher will call the good method with the parameters.
The only problem from a developer experience is that you have to think of your object disposal a bit just like if the GC doesn't exist because a static reference to your instance is kept around. For disposing a DotNetObjectReference you need to call Dispose on it.
I don't know why I went this far on the JSInterop explanation for this blog post, but I hope it'll help someone understand a bit more how it works. Where are we now ? From this work I can identify how I have to do send js object reference to .NET :
- Store a method result to a map
- Create a C# class for keeping the ID around
- When this serialized C# class is send to js interop change it to the corresponding JS object
- Provide a way for clearing the reference on the JS side
Store a method result to a map
The first thing to do is to build the same thing but on js side. I first thought about using a WeakMap but I don't really understand how it can be useful as the key is the object on which we want to keep a weak reference. So, I use a simple javascript object. https://bestvfil522.weebly.com/goldfish-casino-slot-game.html. Here is my method for storing the object : Keep it 1 4 6.
Here is my sample js method calling it
And the JSInterop call
I simplified the class : in Blazor the property is internal and they use a custom JsonConverter for serializing it while hidding it to users.
Using the reference in a method call
Now I need to close this opened window, here is the JS method
And here is the C# interop call Joker games for free.
You might be wondering : how does a JsRuntimeObjectRef becomes a window object on JS side ? With a reviver ! Here is its definition :
This reviver will be called for every serialized object send to JS via JSInterop (even deep in the object graph, so you can send arrays or complex objects with JsRuntimeObjectRef properties).
I don't know why I went this far on the JSInterop explanation for this blog post, but I hope it'll help someone understand a bit more how it works. Where are we now ? From this work I can identify how I have to do send js object reference to .NET :
- Store a method result to a map
- Create a C# class for keeping the ID around
- When this serialized C# class is send to js interop change it to the corresponding JS object
- Provide a way for clearing the reference on the JS side
Store a method result to a map
The first thing to do is to build the same thing but on js side. I first thought about using a WeakMap but I don't really understand how it can be useful as the key is the object on which we want to keep a weak reference. So, I use a simple javascript object. https://bestvfil522.weebly.com/goldfish-casino-slot-game.html. Here is my method for storing the object : Keep it 1 4 6.
Here is my sample js method calling it
And the JSInterop call
I simplified the class : in Blazor the property is internal and they use a custom JsonConverter for serializing it while hidding it to users.
Using the reference in a method call
Now I need to close this opened window, here is the JS method
And here is the C# interop call Joker games for free.
You might be wondering : how does a JsRuntimeObjectRef becomes a window object on JS side ? With a reviver ! Here is its definition :
This reviver will be called for every serialized object send to JS via JSInterop (even deep in the object graph, so you can send arrays or complex objects with JsRuntimeObjectRef properties).
You can find all the working code here.
Cleaning the kept reference from JS runtime memory.
If we leave it like this, jsObjectRefs will keep a reference to js object forever which is bad and can impact your user experience (UX yeah). For removing the object reference in jsObjectRefs we'll do a bit like with DotNetObjectReference and implement IAsyncDisposable in JsRuntimeObjectRef like this
Because you need to set JSRuntime after every new JsRuntimeObjectRef creation, it might be a better idea to wrap this into an extension method.
Jsref V1 14
Typinator 7 9. Here is the JS method
Jsref V1 13
Now, when we close the opened window, the reference to said window will be removed and the browser will be able to GC it (if it feels like it).
BrowserInterop
On my last blog post I talked about my library BrowserInterop which is a library for making the developer life easier when he/she needs to use JSInterop. This library uses a lot of the things I talked about in this blog post because I need to keep reference of window object. For making my life easier I created a bunch of utility methods that you can use :
There is many methods, I will create blog pst about it soon, but you still can use it and send me feedback/bug reports.
Conclusion
I rant a lot in my head about the lack of hooks in ASPNET Core (HttpClient …) but the reviver one, while undocumented, is really great here.
