github.com/vugu/vugu@v0.3.5/vugufmt/testdata/ok/root.vugu

<div class='demo-comp'>
	<div vg-if='data.isLoading'>Loading...</div>


	<div
		vg-if='len(data.bpi.BPI) > 0'>
		<div>Updated: <span vg-html='data.bpi.Time.Updated'></span></div>
		<ul>
			<li vg-for='data.bpi.BPI'>
				<span vg-html='key'></span> <span vg-html='fmt.Sprint(value.Symbol, value.RateFloat)'></span>
			</li>
		</ul>
	</div>
	<button @click='data.HandleClick(event)'>Fetch Bitcoin Price Index</button>
</div>

<script type='application/x-go'>
import "encoding/json"
import "net/http"
import "log"

type RootData struct {
	bpi       bpi
	isLoading bool
}

type bpi struct {
	Time struct {
		Updated string `json:"updated"`
	} `json:"time"`
	BPI map[string]struct {
		Code      string  `json:"code"`
		Symbol    string  `json:"symbol"`
		RateFloat float64 `json:"rate_float"`
	} `json:"bpi"`
}

func (data *RootData) HandleClick(event vugu.DOMEvent) {

	data.bpi = bpi{}

	go func(ee vugu.EventEnv) {

		ee.Lock()
		data.isLoading = true
		ee.UnlockRender()

		res, err := http.Get("https://api.coindesk.com/v1/bpi/currentprice.json")
		if err != nil {
			log.Printf("Error fetch()ing: %v", err)
			return
		}
		defer res.Body.Close()

		var newb bpi
		err = json.NewDecoder(res.Body).Decode(&newb)
		if err != nil {
			log.Printf("Error JSON decoding: %v", err)
			return
		}

		ee.Lock()
		defer ee.UnlockRender()
		data.bpi = newb
		data.isLoading = false

	}(event.EventEnv())
}

</script>