CODEWITHSUNDEEP
amazon-web-servicesaws-lambdaaws-api-gateway
5nv
5nv

Reputation: 450

Aws lambda + api gateway: only trigger lambda by button click

I have an aws lambda function which runs some python code (which is calling an external api with some extra functions). I attached a trigger, an api gateway, which if I go to the url, the lambda functions runs correctly.

However, I want the lambda function only to be run if they click on a button somewhere on the 'website' of the api-url. Rephrased otherwise, I want the api-url page to have a button, which on click executes the lambda function. Im think that should be quite easy, however I can't figure out how. Due to the information overload I can't seem to find the right video, document example on how to do it.

I tried to add a button on the api-url page by, on 'method-execution' on the 'api-gateway resource' page, changing the mapping template to text/html instead of json. (a bit like in https://blog.it-playground.eu/display-html-page-using-only-api-gateway/) But then i can't figure out how to run the lambda function onClick of the button. ==> Is this the right start?

(Because its not really a coding issue, I can't really provide any code).

Also, is this question so simply that it shows I simply don't understand the basics enough (and should subsequently go over them again)?

Upvotes: 0

Views: 2196

Answers (1)

Matus Dubrava
Matus Dubrava

Reputation: 14502

Of course this is possible. API Gateway exposes REST API. All you need to do is to create some resource and method in API Gateway such as

GET /posts

attach your lambda function to it, and hit that API endpoint with some ajax request from your front end (via fetch, axios, ...) that would be executed when the button is clicked. Something like:

button.addEventListener("click", () => {
    fetch("https://my-api-gateway-url/posts").then() ...
}

You can process the response data in .then part but don't forget that this is asynchronous coding so you need to handle it as such.

Upvotes: 1

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