using fetch()

[BobSquarePants]

Hi everyone,

I would like to use an online API than return a JSON..

out of topic

I rather preferred had a YAML reply.. but it's not provided yet..

The requests to the API work with a GET to an URL with (?key=value)
example https://theAPI.com?key=value

I would like to process the data in the frontend.
I've only found the fetch() method.. (maybe something more simpler exist ??? )

The code readability on the example is indecipherable, not the fault of MDN but because of the JS nature syntax , And no matter what, I can't put my head around it..

So how could we use fetch() trough Bryhton (without _stdlib.js )

Thanks.

[BobSquarePants]

I've tried this

def f_succeed():
    print('succeed')
	
window.fetch(window.encodeURI('https://theAPI.com?test=test'), {'redirect':'error'}).then(f_succeed)

but of course it's not working... 😢

error

Uncaught (in promise) Error:

[PierreQuentel]

Requests sent from a browser can only reach resources with the same origin as the calling script, except if the server where the resource stands sets the cross-origin headers. Is it the case in your example ?

If so, you can use the Javascript-like syntax window.fetch(url).then(handle_reponse), or a maybe more pythonic async code like

from browser import window, aio

async def f():
    response = await window.fetch('test.html')
    if response.status == 200:
        text = await response.text()
        print(text)

aio.run(f())

[BobSquarePants]

Hi @PierreQuentel ,

Once again thank you for your guidance.

I will start first with a JS-like syntax 👎, then later on with the extra module aio.

I have now

def fetched(ResJSobj):
    
    if ResJSobj.ok == True:
        print(ResJSobj.text()) 
    else:
        print("it didn't worked")

window.fetch('/aLocalPage').then(fetched)

but the successful print return

<Javascript object: [object Promise]>

is there a way to get the text string (without aio module ? )

[PierreQuentel]

As the documentation of fetch() says, it resolves to a Response object, and Response.text() is a promise that resolves to the text content of the resource. You should do something like

def handle_content(s):
    print(s)
    
def fetched(ResJSobj):
    if ResJSobj.ok:
        ResJSobj.text().then(handle_content)
    else:
        print("it didn't work")

window.fetch('/aLocalPage').then(fetched)

[BobSquarePants]

Thank you @PierreQuentel 🙏🏽 !

I didn't fully understood that then() was a callback caller.

It's not Pytonic.. but it will do until I manage to get AIO up and running :)