Two way communication

[fairking]

First I wish the documentation contains some examples around events.

Second I am looking for a way to call the backend and get the result back (like http request). Is there any way to do so?

For example the following event: https://wails.io/docs/reference/runtime/events#eventsemit

JS: EventsEmit(eventName string, optionalData function(optionalData?: any))

It does not send the data back to JS.

It could be something like this:
JS:

let data = { 
    route: "store/get_list", 
    body: { 
        query: { 
            page: 1, 
            page_size: 100 
        } 
    }
}

EventsEmit("request", data) // returns Promise
    .then(result => my_grid.source = result.data) // returns a list of stores
    .catch(error => alert(error.message)) // returns error if the go throws an error

Go:

EventsOn(ctx, "request", func(data) (result, error) {

    var request := json.Parse(data).(*DataRequest)

    switch (request.route) {
        case "store/get_list":
            var query := json.Parse(request.body).(*StoreListQuery)
            result, error := dbRepository.GetStores(query)
            return result, error
        default:
            return nil, fmt.Errorf("request: route not found %r", request.route)
    }
})

Example: https://tauri.app/v1/guides/features/command/#returning-data

Is it possible?

Without that the Hybrid apps are not possible with Wails. That is the problem why Wails is not so popular.

P.S. the Go -> JS communication could be one way only, as it is mostly used for push notifications, nothing else.

[OlegGulevskyy]

There is an example included in every (I think) starter application of Wails. For example, I know for a fact - Svelte and React templates have it.
When you have a method declared on your App struct, this method is exposed to your frontend after generating module bindings.
Or simply put it - after you run wails dev or wails build. Your frontend folder will contains wailsjs folder with all the bindings.
I do however recommend checking out the templates and see how frontend makes the call to Go with a simple demo of Inputting your name, submitting it to the backend (Go) and it returns you a formatted string.

Not only you get data returned back from Go, but it is also type safe because you have App.d.ts. file generated with return types of the function you are calling.

[fairking]

Yes, I have just checked. That is exactly what I am looking for. I haven't seen it in docs. That is why I was wondering.

[leaanthony]

Also, feel free to improve the documentation.