iron-ajax | Easily make ajax requests

I am trying to generate an iron-ajax request and run a test on its response in Polymer 2.x with using the Mocha test suite.

However, when running this test I get the following error:

Cannot read property 'generateRequest' of undefined Context. at my-test.html:25

I'm implementing my website using Polymer 3.0. I'm creating buttons in javascript. And I want to call user defined function on-click of the button.

I have tried adding event listener but the function is getting invoked as soon as the page is loaded. I have tried calling the function in bu.onclick function but the function is not getting invoked

//My code below

I have the following code:

I have the following in the application template:

I am creating a polymer 2.0 PWA / Website. I have a problem with accessing a div container (I wish to zoom in and zoom out the div based on a user input).

In shadow dom with template dom if I am not able to get the element in Javascript so that on user action (like button click or slider) movement I can zoom the div.

I tried document getElementsByClassName, shadowroot search. I can see in shadow dom that this div is present. just not able to access it in javascript function in Polymer.

i am using web component iron ajax to make REST api call following this tutorial http://frontendinsights.com/polymer-rest-api-using-iron-ajax/ i am fetching this data and storing using predix data table to show the fetched data from api on ui using data table https://www.predix-ui.com/#/components/px-data-table/ which basically accepts the data in JSON format.

I am trying to run a test on the Google Cloud Vision API to see how it fares to the client side Shape Detection API.

I am hoping to POST JSON with a base64 encoded image and get image text and barcodes returned.

I have created a GCP project and API key per the tutorial at (https://cloud.google.com/vision/docs/before-you-begin), but am getting an 401 error when trying to make requests.

error: {code: 401,…}
code: 401
message: "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project."
status: "UNAUTHENTICATED"

The request is written in Polymer 2.x as follows:

How do I pass the response of an iron-ajax to another page?

I have two pages which will display different things from the same data(response). Is there a way to pass the response of an iron-ajax in page-x.html to page-y.html without generating the same request in each page.

I am trying to implement the hash scroll to in the following app page.

I am setting the id of the function-detail to the name of the function. When I add the hash to the URL of the function named, I do not get a scroll to in the contents of the app-header=layout. What am I missing?