我有这段代码,我想知道是否可以通过移动滑块来更改图像的大小:
<div class="slidecontainer">
<input type="range" min="1" max="20" value="1" class="slider" id="Slider">
</div>
<img src="https://upload.wikimedia.org/wikipedia/commons/8/85/Elon_Musk_Royal_Society_%28crop1%29.jpg" id="Elon">
有人可以帮忙吗?
答案 0 :(得分:1)
您可以向范围添加一个 eventListener,然后在那里应用您的逻辑来更改图像的尺寸。
const slider = document.getElementById('Slider');
slider.addEventListener('input', handleChange);
function handleChange(e) {
const img = document.getElementById("Elon");
const {value, max} = e.target;
img.style.width = `${value*max}px`;
img.style.height = `${value*max}px`;
}
<div class="slidecontainer">
<input type="range" min="1" max="20" value="1" class="slider" id="Slider">
</div>
<img src="https://upload.wikimedia.org/wikipedia/commons/8/85/Elon_Musk_Royal_Society_%28crop1%29.jpg" id="Elon">
答案 1 :(得分:0)
类似于:
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_LOCATION = 1;
private static final int ACCESS_COARSE_LOCATION =2 ;
private static final int ACCESS_FINE_LOCATION =3 ;
private static final int INTERNET =4 ;
Button btnGetLocation;
TextView showLocation;
LocationManager locationManager;
String latitude, longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActivityCompat.requestPermissions( this,
new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);
showLocation = findViewById(R.id.showLocation);
btnGetLocation = findViewById(R.id.btnGetLocation);
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
btnGetLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// location nManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);//error come here
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
OnGPS();
} else {
getLocation();
}
}
});
}
private void OnGPS() {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Enable GPS").setCancelable(false).setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
}).setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
final AlertDialog alertDialog = builder.create();
alertDialog.show();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == ACCESS_COARSE_LOCATION) {
if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this, "ACCESS Permission Granted", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "ACCESS Permission Denied", Toast.LENGTH_SHORT).show();
}
} else if (requestCode == ACCESS_FINE_LOCATION) {
if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this, "ACCESS Permission Granted", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "ACCESS Permission Denied", Toast.LENGTH_SHORT).show();
}
} else if (requestCode == INTERNET) {
if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this, "INTERNET Permission Granted", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "INTERNET Permission Denied", Toast.LENGTH_SHORT).show();
}
}
}
private void getLocation() {
if (ActivityCompat.checkSelfPermission(
MainActivity.this,Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(
MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);
} else {
Location locationGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (locationGPS != null) {
double lat = locationGPS.getLatitude();
double longi = locationGPS.getLongitude();
latitude = String.valueOf(lat);
longitude = String.valueOf(longi);
showLocation.setText("Your Location: " + "\n" + "Latitude: " + latitude + "\n" + "Longitude: " + longitude);
} else {
Toast.makeText(this, "Unable to find location.", Toast.LENGTH_SHORT).show();
}
}
}
}
注意,这只是一个草图,如果你只是复制和粘贴它可能无法工作。
答案 2 :(得分:0)
在滑块更改时更改 img 宽度。像下面的东西
const sliderElem = document.getElementById('Slider');
const imageElem = document.getElementById('image');
function sliderChange() {
const width = image.getAttribute('width');
image.setAttribute("width", Number(width) + Number(sliderElem.value));
}
<div class="slidecontainer">
<input onChange="sliderChange()" type="range" min="1" max="20" value="1" class="slider" id="Slider">
</div>
<img id="image" width="150" src="https://upload.wikimedia.org/wikipedia/commons/8/85/Elon_Musk_Royal_Society_%28crop1%29.jpg" id="Elon">
答案 3 :(得分:0)
您需要为此使用一些 javascript 这是您可以运行并查看的代码。 如果您想要更大的缩放比例,请根据您的选择而不是 x*10 写 20 或 30。
document.getElementById("Slider").oninput = function changeImageSize(){
var x = document.getElementById("Slider").value;
document.getElementById("Elon").style.height=String(x*10) + "px";
}
<div class="slidecontainer">
<input type="range" min="1" max="20" value="1" class="slider" id="Slider">
</div>
<img src="https://upload.wikimedia.org/wikipedia/commons/8/85/Elon_Musk_Royal_Society_%28crop1%29.jpg" id="Elon">