To send an API call when a button is clicked after retrieving the user's current location, you can add a button to your React component and attach an event handler to it.

Here's an example where we use the fetch() method to make an API call to the OpenWeatherMap API to get the current weather for the user's location:

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import React, { useState } from 'react';

function WeatherApp() {
  const [location, setLocation] = useState(null);
  const [weather, setWeather] = useState(null);

  function handleLocationClick() {
    if (navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(success, error);
    } else {
      console.log("Geolocation not supported");
    }
  }

  function success(position) {
    const latitude = position.coords.latitude;
    const longitude = position.coords.longitude;
    setLocation({ latitude, longitude });
    console.log(`Latitude: ${latitude}, Longitude: ${longitude}`);

    // Make API call to OpenWeatherMap
    fetch(`https://api.openweathermap.org/data/2.5/weather?lat=${latitude}&lon=${longitude}&appid=<YOUR_API_KEY>&units=metric`)
      .then(response => response.json())
      .then(data => {
        setWeather(data);
        console.log(data);
      })
      .catch(error => console.log(error));
  }

  function error() {
    console.log("Unable to retrieve your location");
  }

  return (
    <div>
      {!location ? <button onClick={handleLocationClick}>Get Location</button> : null}
      {location && !weather ? <p>Loading weather data...</p> : null}
      {weather ? (
        <div>
          <p>Location: {weather.name}</p>
          <p>Temperature: {weather.main.temp} °C</p>
          <p>Weather: {weather.weather[0].description}</p>
        </div>
      ) : null}
    </div>
  );
}

export default WeatherApp;

In this example, we define a WeatherApp component that uses the useState hook to store the user's location and the weather data. We also define a handleLocationClick() function that gets called when a button is clicked. If geolocation is supported, this function calls getCurrentPosition() just like in the previous example.

If the location is successfully obtained, the success() function stores the latitude and longitude in location using the setLocation() function, logs them to the console, and makes an API call to OpenWeatherMap to get the weather data. We use template literals to construct the API URL with the latitude and longitude retrieved from the geolocation API.

When the API call is successful, we get the JSON data using the response.json() method and store it in weather using the setWeather() function. We also log the data to the console for debugging purposes.

Finally, in the JSX markup, we conditionally render a button that triggers the handleLocationClick() function, a loading message while the weather data is being fetched, and the weather data when it's available. We display the temperature, location, and weather description in the DOM. You'll need to replace <YOUR_API_KEY> with your own API key for the OpenWeatherMap API.