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Core

Core JavaScript features

Integrate your JavaScript code with the basic functions of your AppMachine app. This page discusses the available functions and possible errors that lie at the basis of each JavaScript block.

Get Block Name​

Get the current name of the block.

import { getBlockName } from '@myjsblock/sdk'

const myBlockName = await getBlockName();

// or

getBlockName().then(data => {  
    console.log(data);
});

Errors​

Here is a list of errors that can be thrown when calling this function in addition to generic errors:

Error Code
Description

INVALID_ARGUMENT

The 'caption' property is not defined on the block.

Get Property​

Get a property by name from the current block.

import { getProperty } from '@myjsblock/sdk'

const myProperty = await getProperty('myProperty');

// or

getProperty('myProperty').then(data => {  
    console.log(data);
});

Arguments​

Name
Type
Required
Default

propertyName

String

✅

-

Errors​

Here is a list of errors that can be thrown when calling this function in addition to generic errors:

Error Code
Description

INVALID_ARGUMENT

The provided propertyName is not found.

Get Image Url​

Get a public URL of an image, based on the given imageId.

import { getImageUrl } from '@myjsblock/sdk'

const myImage = await getImageUrl('myImageId');

const imageElement = document.createElement('img');
imageElement.src = myImage;

document.body.appendChild(imageElement);

Image Resizing​

By default the image URL that will be returned is the URL of the image in full resolution. We recommend using fixed dimensions for the width and height options when using high resolution images. This also improves performance and saves bandwidth.

Basic Example​

import { getImageUrl } from '@myjsblock/sdk'

const myImage = await getImageUrl('myImageId', {    
    width: 300,    
    height: 300
});

const imageElement = document.createElement('img');
imageElement.src = myImage;

document.body.appendChild(imageElement);

Multiple Image sizes​

It is also possible to use multiple image resolution depending on the device resolution or pixel density using image src sets. Read MDN guide for more information.

import { getImageUrl } from '@myjsblock/sdk'

const myImageId = 'a181f12c-3116-11e5-80d0-00155d130a43';

const imageSourceDimensions = {    
    '300w': [280, 210],    
    '768w': [748, 561],    
    '1280w': [1260, 945]
};

const imageSourcePromises = Object.values(imageSourceMap).map(([width, height]) => getImageUrl('myImageId', { width, height }));

const imageSourceUrls = await Promise.all(imageSourcePromises);

const imageSourceMap = Object.entries(imageSourceDimensions).map(([viewPortWidth], dimensionIndex) => [viewPortWidth, imageSourceUrls[dimensionIndex]]);
// Returns array of e.g. ['300w', 'https://myasseturl...']

const sourceSet = imageSourceMap.map(([viewPortWidth, imageUrl]) => `${imageUrl} ${viewPortWidth}`).join(', ');

const imageElement = document.createElement('img');

const defaultImage = imageSourceMap[0][1]; // Smallest image
imageElement.src = defaultImage;

imageElement.srcset = sourceSet;

document.body.appendChild(imageElement);

Result​

<html>    
    <body>
        <img            
            src="https://static.accept.appmachine.com/api/image/x/a181f12c-3116-11e5-80d0-00155d130a43"            
            srcset="https://static.accept.appmachine.com/api/image/280x210/a181f12c-3116-11e5-80d0-00155d130a43 300w, https://static.accept.appmachine.com/api/image/748x561/a181f12c-3116-11e5-80d0-00155d130a43 768w, https://static.accept.appmachine.com/api/image/1260x945/a181f12c-3116-11e5-80d0-00155d130a43 1280w"        
        />    
    </body>
</html>

Arguments​

Name
Type
Required
Default

imageId

String

✅

-

dimensions

{ width: Number, height: Number }

-

Errors​

Here is a list of errors that can be thrown when calling this function in addition to generic errors:

Error Code
Description

INVALID_ARGUMENT

imageId is missing or the width or height isn't a number.

Show Loader​

Show an overlay with a spinner.

import { showLoader, hideLoader } from '@myjsblock/sdk'const loadData = async () => {  await showLoader()  try {    await fetchData()  } finally {    await hideLoader()  }}

Hide Loader​

Hide the loader overlay that was shown by the showLoader function.

import { showLoader, hideLoader } from '@myjsblock/sdk'const loadData = async () => {  await showLoader()  try {    await fetchData()  } finally {    await hideLoader()  }}

Errors​

Here is a list of errors that can be thrown when calling this function in addition to generic errors:

Error Code
Description

OPERATION_NOT_ALLOWED

There is no active loader.

Generic errors​

Error Code
Description

UNKNOWN_ERROR

Unknown error occurred.

TIMEOUT_EXCEEDED

The app failed to respond within the set timeout.

UNKNOWN_FUNCTION

The function that was called doesn't exist.

VERSION_NOT_SUPPORTED

The function isn't supported in the current version of the app.

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