Cordova plugin that allows camera interaction from Javascript and HTML
Releases are being kept up to date when appropriate. However, this plugin is under constant development. As such it is recommended to use master to always have the latest fixes & features.
PR's are greatly appreciated. Maintainer(s) wanted.
- Start a camera preview from HTML code.
- Maintain HTML interactivity.
- Drag the preview box.
- Set camera color effect.
- Send the preview box to back of the HTML content.
- Set a custom position for the camera preview box.
- Set a custom size for the preview box.
- Set a custom alpha for the preview box.
- Set the focus mode, zoom, color effects, exposure mode, white balance mode and exposure compensation
- Tap to focus
Use any one of the installation methods listed below depending on which framework you use.
To install the master version with latest fixes and features
cordova plugin add https://github.com/cordova-plugin-camera-preview/cordova-plugin-camera-preview.git
ionic cordova plugin add https://github.com/cordova-plugin-camera-preview/cordova-plugin-camera-preview.git
meteor add cordova:cordova-plugin-camera-preview@https://github.com/cordova-plugin-camera-preview/cordova-plugin-camera-preview.git#[latest_commit_id]
<plugin spec="https://github.com/cordova-plugin-camera-preview/cordova-plugin-camera-preview.git" source="git" />
or if you want to use the last released version on npm
cordova plugin add cordova-plugin-camera-preview
ionic cordova plugin add cordova-plugin-camera-preview
meteor add cordova:cordova-plugin-camera-preview@X.X.X
<gap:plugin name="cordova-plugin-camera-preview" />
If you are developing for iOS 10+ you must also add the following to your config.xml
<config-file platform="ios" target="*-Info.plist" parent="NSCameraUsageDescription" overwrite="true">
<string>Allow the app to use your camera</string>
</config-file>
<!-- or for Phonegap -->
<gap:config-file platform="ios" target="*-Info.plist" parent="NSCameraUsageDescription" overwrite="true">
<string>Allow the app to use your camera</string>
</gap:config-file>When using the plugin for older devices, the camera preview will take the focus inside the app once initialized.
In order to prevent the app from closing when a user presses the back button, the event for the camera view is disabled.
If you still want the user to navigate, you can add a listener for the back event for the preview
(see onBackButton)
Starts the camera preview instance.
Options: All options stated are optional and will default to values here
x- Defaults to 0y- Defaults to 0width- Defaults to window.screen.widthheight- Defaults to window.screen.heightcamera- SeeCAMERA_DIRECTION- Defaults to front cameratoBack- Defaults to false - Set to true if you want your html in front of your previewtapPhoto- Defaults to true - Does not work if toBack is set to false in which case you use the takePicture methodtapFocus- Defaults to false - Allows the user to tap to focus, when the view is in the foregroundpreviewDrag- Defaults to false - Does not work if toBack is set to falsestoreToFile- Defaults to false - Capture images to a file and return back the file path instead of returning base64 encoded data.disableExifHeaderStripping- Defaults to false - Android Only - Disable automatic rotation of the image, and let the browser deal with it (keep reading on how to achieve it)
let options = {
x: 0,
y: 0,
width: window.screen.width,
height: window.screen.height,
camera: CameraPreview.CAMERA_DIRECTION.BACK,
toBack: false,
tapPhoto: true,
tapFocus: false,
previewDrag: false,
storeToFile: false,
disableExifHeaderStripping: false
};
CameraPreview.startCamera(options);When setting the toBack to true, remember to add the style below on your app's HTML or body element:
html, body, .ion-app, .ion-content {
background-color: transparent;
}When both tapFocus and tapPhoto are true, the camera will focus, and take a picture as soon as the camera is done focusing.
Stops the camera preview instance.
CameraPreview.stopCamera();Switch between the rear camera and front camera, if available.
CameraPreview.switchCamera();Show the camera preview box.
CameraPreview.show();Hide the camera preview box.
CameraPreview.hide();Take the picture. If width and height are not specified or are 0 it will use the defaults. If width and height are specified, it will choose a supported photo size that is closest to width and height specified and has closest aspect ratio to the preview. The argument quality defaults to 85 and specifies the quality/compression value: 0=max compression, 100=max quality.
CameraPreview.takePicture({width:640, height:640, quality: 85}, function(base64PictureData|filePath) {
/*
if the storeToFile option is false (the default), then base64PictureData is returned.
base64PictureData is base64 encoded jpeg image. Use this data to store to a file or upload.
Its up to the you to figure out the best way to save it to disk or whatever for your application.
*/
/*
if the storeToFile option is set to true, then a filePath is returned. Note that the file
is stored in temporary storage, so you should move it to a permanent location if you
don't want the OS to remove it arbitrarily.
*/
// One simple example is if you are going to use it inside an HTML img src attribute then you would do the following:
imageSrcData = 'data:image/jpeg;base64,' + base64PictureData;
$('img#my-img').attr('src', imageSrcData);
});
// OR if you want to use the default options.
CameraPreview.takePicture(function(base64PictureData){
/* code here */
});Get focus modes supported by the camera device currently started. Returns an array containing supported focus modes. See FOCUS_MODE for possible values that can be returned.
CameraPreview.getSupportedFocusModes(function(focusModes){
focusModes.forEach(function(focusMode) {
console.log(focusMode + ', ');
});
});Set the focus mode for the camera device currently started.
focusMode-FOCUS_MODE
CameraPreview.setFocusMode(CameraPreview.FOCUS_MODE.CONTINUOUS_PICTURE);Get the focus mode for the camera device currently started. Returns a string representing the current focus mode.See FOCUS_MODE for possible values that can be returned.
CameraPreview.getFocusMode(function(currentFocusMode){
console.log(currentFocusMode);
});Get the flash modes supported by the camera device currently started. Returns an array containing supported flash modes. See FLASH_MODE for possible values that can be returned
CameraPreview.getSupportedFlashModes(function(flashModes){
flashModes.forEach(function(flashMode) {
console.log(flashMode + ', ');
});
});Set the flash mode. See FLASH_MODE for details about the possible values for flashMode.
CameraPreview.setFlashMode(CameraPreview.FLASH_MODE.ON);Get the flash mode for the camera device currently started. Returns a string representing the current flash mode.See FLASH_MODE for possible values that can be returned
CameraPreview.getFlashMode(function(currentFlashMode){
console.log(currentFlashMode);
});Get the Horizontal FOV for the camera device currently started. Returns a string of a float that is the FOV of the camera in Degrees.
CameraPreview.getHorizontalFOV(function(getHorizontalFOV){
console.log(getHorizontalFOV);
});Currently this feature is for Android only. A PR for iOS support would be happily accepted
Get color modes supported by the camera device currently started. Returns an array containing supported color effects (strings). See COLOR_EFFECT for possible values that can be returned.
CameraPreview.getSupportedColorEffects(function(colorEffects){
colorEffects.forEach(function(color) {
console.log(color + ', ');
});
});Set the color effect. See COLOR_EFFECT for details about the possible values for colorEffect.
CameraPreview.setColorEffect(CameraPreview.COLOR_EFFECT.NEGATIVE);Set the zoom level for the camera device currently started. zoomMultipler option accepts an integer. Zoom level is initially at 1
CameraPreview.setZoom(2);Get the current zoom level for the camera device currently started. Returns an integer representing the current zoom level.
CameraPreview.getZoom(function(currentZoom){
console.log(currentZoom);
});Get the maximum zoom level for the camera device currently started. Returns an integer representing the manimum zoom level.
CameraPreview.getMaxZoom(function(maxZoom){
console.log(maxZoom);
});Returns an array with supported white balance modes for the camera device currently started. See WHITE_BALANCE_MODE for details about the possible values returned.
CameraPreview.getSupportedWhiteBalanceModes(function(whiteBalanceModes){
console.log(whiteBalanceModes);
});Get the curent white balance mode of the camera device currently started. See WHITE_BALANCE_MODE for details about the possible values returned.
CameraPreview.getWhiteBalanceMode(function(whiteBalanceMode){
console.log(whiteBalanceMode);
});Set the white balance mode for the camera device currently started. See WHITE_BALANCE_MODE for details about the possible values for whiteBalanceMode.
CameraPreview.setWhiteBalanceMode(CameraPreview.WHITE_BALANCE_MODE.CLOUDY_DAYLIGHT);Returns an array with supported exposure modes for the camera device currently started. See EXPOSURE_MODE for details about the possible values returned.
CameraPreview.getExposureModes(function(exposureModes){
console.log(exposureModes);
});Get the curent exposure mode of the camera device currently started. See EXPOSURE_MODE for details about the possible values returned.
CameraPreview.getExposureMode(function(exposureMode){
console.log(exposureMode);
});Set the exposure mode for the camera device currently started. See EXPOSURE_MODE for details about the possible values for exposureMode.
CameraPreview.setExposureMode(CameraPreview.EXPOSURE_MODE.CONTINUOUS);Get the minimum and maximum exposure compensation for the camera device currently started. Returns an object containing min and max integers.
CameraPreview.getExposureCompensationRange(function(expoxureRange){
console.log("min: " + exposureRange.min);
console.log("max: " + exposureRange.max);
});Get the current exposure compensation for the camera device currently started. Returns an integer representing the current exposure compensation.
CameraPreview.getExposureCompensation(function(expoxureCompensation){
console.log(exposureCompensation);
});Set the exposure compensation for the camera device currently started. exposureCompensation accepts an integer. if exposureCompensation is lesser than the minimum exposure compensation, it is set to the minimum. if exposureCompensation is greater than the maximum exposure compensation, it is set to the maximum. (see getExposureCompensationRange() to get the minumum an maximum exposure compensation).
CameraPreview.setExposureCompensation(-2);
CameraPreview.setExposureCompensation(3);Change the size of the preview window.
CameraPreview.setPreviewSize({width: window.screen.width, height: window.screen.height});CameraPreview.getSupportedPictureSizes(function(dimensions){
// note that the portrait version, width and height swapped, of these dimensions are also supported
dimensions.forEach(function(dimension) {
console.log(dimension.width + 'x' + dimension.height);
});
});Get the characteristics of all available cameras. Returns a JSON object representing the characteristics of all available cameras.
CameraPreview.getCameraCharacteristics(function(characteristics){
console.log(characteristics);
});Example Characteristics:
{
"CAMERA_CHARACTERISTICS": [
{
"INFO_SUPPORTED_HARDWARE_LEVEL": 1,
"LENS_FACING": 1,
"SENSOR_INFO_PHYSICAL_SIZE_WIDTH": 5.644999980926514,
"SENSOR_INFO_PHYSICAL_SIZE_HEIGHT": 4.434999942779541,
"SENSOR_INFO_PIXEL_ARRAY_SIZE_WIDTH": 4032,
"SENSOR_INFO_PIXEL_ARRAY_SIZE_HEIGHT": 3024,
"LENS_INFO_AVAILABLE_FOCAL_LENGTHS": [
{
"FOCAL_LENGTH": 4.199999809265137
}
]
},
{
"INFO_SUPPORTED_HARDWARE_LEVEL": 0,
"LENS_FACING": 0,
"SENSOR_INFO_PHYSICAL_SIZE_WIDTH": 3.494999885559082,
"SENSOR_INFO_PHYSICAL_SIZE_HEIGHT": 2.625999927520752,
"SENSOR_INFO_PIXEL_ARRAY_SIZE_WIDTH": 2608,
"SENSOR_INFO_PIXEL_ARRAY_SIZE_HEIGHT": 1960,
"LENS_INFO_AVAILABLE_FOCAL_LENGTHS": [
{
"FOCAL_LENGTH": 2.0999999046325684
}
]
}
]
}
Set specific focus point. Note, this assumes the camera is full-screen.
let xPoint = event.x;
let yPoint = event.y
CameraPreview.tapToFocus(xPoint, yPoint);Callback event for the back button tap
CameraPreview.onBackButton(function() {
console.log('Back button pushed');
});When working with local files you may want to display those on certain containers like canvas, given that file:// is not always a valid url type, you need to first convert it explicitly to a blob, before you push it further into the display side. The function getBlob will do the proper conversion for you, and if succedeed will pass the content on it's callback function as first argument.
function displayImage(content) {
var ctx = $("canvas").getContext('2d');
img.onload = function(){
ctx.drawImage(img, 0, 0)
}
img.src = URL.createObjectURL(blob);
}
function takePicture() {
CameraPreview.takePicture({width: app.dimension.width, height: app.dimension.height}, function(data){
if (cordova.platformId === 'android') {
CameraPreview.getBlob('file://' + data, function(image) {
displayImage(image);
});
} else {
displayImage('data:image/jpeg;base64,' + data);
}
});
}When capturing large images you may want them to be stored into a file instead of having them base64 enconded, as enconding at least on Android is very expensive. With the feature storeToFile enabled the plugin will capture the image into a temporary file inside the application temporary cache (the same place where Cordova will extract your assets). This method is better used with disableExifHeaderStripping to get the best possible performance.
Example:
<script src="https://raw.githubusercontent.com/blueimp/JavaScript-Load-Image/master/js/load-image.all.min.js"></script>
<p><div id="originalPicture" style="width: 100%"></div></p>let options = {
x: 0,
y: 0,
width: window.screen.width,
height: window.screen.height,
camera: CameraPreview.CAMERA_DIRECTION.BACK,
toBack: false,
tapPhoto: true,
tapFocus: false,
previewDrag: false,
disableExifHeaderStripping: true,
storeToFile: true
};
....
function gotRotatedCanvas(canvasimg) {
var displayCanvas = $('canvas#display-canvas');
loadImage.scale(canvasimg, function(img){
displayCanvas.drawImage(img)
}, {
maxWidth: displayCanvas.width,
maxHeight: displayCanvas.height
});
}
CameraPreview.getSupportedPictureSizes(function(dimensions){
dimensions.sort(function(a, b){
return (b.width * b.height - a.width * a.height);
});
var dimension = dimensions[0];
CameraPreview.takePicture({width:dimension.width, height:dimension.height, quality: 85}, function(path){
var image = 'file://' + path;
let holder = document.getElementById('originalPicture');
let width = holder.offsetWidth;
loadImage(
image,
function(canvas) {
holder.innerHTML = "";
if (app.camera === 'front') {
// front camera requires we flip horizontally
canvas.style.transform = 'scale(1, -1)';
}
holder.appendChild(canvas);
},
{
maxWidth: width,
orientation: true,
canvas: true
}
);
});
});If you want to capture large images you will notice in Android that performace is very bad, in those cases you can set this flag, and add some extra Javascript/HTML to get a proper display of your captured images without risking your application speed.
Example:
<script src="https://raw.githubusercontent.com/blueimp/JavaScript-Load-Image/master/js/load-image.all.min.js"></script>
<p><div id="originalPicture" style="width: 100%"></div></p>let options = {
x: 0,
y: 0,
width: window.screen.width,
height: window.screen.height,
camera: CameraPreview.CAMERA_DIRECTION.BACK,
toBack: false,
tapPhoto: true,
tapFocus: false,
previewDrag: false,
disableExifHeaderStripping: true
};
....
function gotRotatedCanvas(canvasimg) {
var displayCanvas = $('canvas#display-canvas');
loadImage.scale(canvasimg, function(img){
displayCanvas.drawImage(img)
}, {
maxWidth: displayCanvas.width,
maxHeight: displayCanvas.height
});
}
CameraPreview.getSupportedPictureSizes(function(dimensions){
dimensions.sort(function(a, b){
return (b.width * b.height - a.width * a.height);
});
var dimension = dimensions[0];
CameraPreview.takePicture({width:dimension.width, height:dimension.height, quality: 85}, function(base64PictureData){
/*
base64PictureData is base64 encoded jpeg image. Use this data to store to a file or upload.
Its up to the you to figure out the best way to save it to disk or whatever for your application.
*/
var image = 'data:image/jpeg;base64,' + imgData;
let holder = document.getElementById('originalPicture');
let width = holder.offsetWidth;
loadImage(
image,
function(canvas) {
holder.innerHTML = "";
if (app.camera === 'front') {
// front camera requires we flip horizontally
canvas.style.transform = 'scale(1, -1)';
}
holder.appendChild(canvas);
},
{
maxWidth: width,
orientation: true,
canvas: true
}
);
});Focus mode settings:
| Name | Type | Default | Note |
|---|---|---|---|
| FIXED | string | fixed | |
| AUTO | string | auto | |
| CONTINUOUS | string | continuous | IOS Only |
| CONTINUOUS_PICTURE | string | continuous-picture | Android Only |
| CONTINUOUS_VIDEO | string | continuous-video | Android Only |
| EDOF | string | edof | Android Only |
| INFINITY | string | infinity | Android Only |
| MACRO | string | macro | Android Only |
Flash mode settings:
| Name | Type | Default | Note |
|---|---|---|---|
| OFF | string | off | |
| ON | string | on | |
| AUTO | string | auto | |
| RED_EYE | string | red-eye | Android Only |
| TORCH | string | torch |
Camera direction settings:
| Name | Type | Default |
|---|---|---|
| BACK | string | back |
| FRONT | string | front |
Color effect settings:
| Name | Type | Default | Note |
|---|---|---|---|
| AQUA | string | aqua | Android Only |
| BLACKBOARD | string | blackboard | Android Only |
| MONO | string | mono | |
| NEGATIVE | string | negative | |
| NONE | string | none | |
| POSTERIZE | string | posterize | |
| SEPIA | string | sepia | |
| SOLARIZE | string | solarize | Android Only |
| WHITEBOARD | string | whiteboard | Android Only |
Exposure mode settings:
| Name | Type | Default | Note |
|---|---|---|---|
| AUTO | string | auto | IOS Only |
| CONTINUOUS | string | continuous | |
| CUSTOM | string | custom | |
| LOCK | string | lock | IOS Only |
Note: Use AUTO to allow the device automatically adjusts the exposure once and then changes the exposure mode to LOCK.
White balance mode settings:
| Name | Type | Default | Note |
|---|---|---|---|
| LOCK | string | lock | |
| AUTO | string | auto | |
| CONTINUOUS | string | continuous | IOS Only |
| INCANDESCENT | string | incandescent | |
| CLOUDY_DAYLIGHT | string | cloudy-daylight | |
| DAYLIGHT | string | daylight | |
| FLUORESCENT | string | fluorescent | |
| SHADE | string | shade | |
| TWILIGHT | string | twilight | |
| WARM_FLUORESCENT | string | warm-fluorescent |
It is not possible to use your computers webcam during testing in the simulator, you must device test.
The default ANDROID_SUPPORT_LIBRARY_VERSION is set to 26+.
If you need a different version, add argument --variable ANDROID_SUPPORT_LIBRARY_VERSION="{version}".
Or edit config.xml with following,
<plugin name="cordova-plugin-camera-preview" spec="X.X.X">
<variable name="ANDROID_SUPPORT_LIBRARY_VERSION" value="26+" />
</plugin>cordova-plugin-camera-preview-sample-app for a complete working Cordova example for Android and iOS platforms.
Maintained by Weston Ganger - @westonganger
Created by Marcel Barbosa Pinto @mbppower