https://github.com/shaack/svjs-observe

Observe properties, Arrays, Sets and Maps of an Object. Can also intercept function calls.
https://github.com/shaack/svjs-observe

Last synced: about 2 months ago
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Observe properties, Arrays, Sets and Maps of an Object. Can also intercept function calls.

• Host: GitHub
• URL: https://github.com/shaack/svjs-observe
• Owner: shaack
• License: mit
• Created: 2017-11-28T12:23:11.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2018-05-10T22:55:57.000Z (about 8 years ago)
• Last Synced: 2025-03-08T10:51:58.120Z (over 1 year ago)
• Language: JavaScript
• Homepage:
• Size: 33.2 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# svjs-observe

An ES6 Module to observe properties (simple properties, Arrays, Sets and Maps) 

of an Object. Can also intercept function calls.

Observing means to call a callback-function every value change of an Object property.

## Methods

### Observe.property(object, propertyName, callback)

Observe properties (attributes) of an object. Works also with Arrays, Maps and Sets. 

The parameter `propertyName` can be an array of names to observe multiple properties.

#### callback params

`{ propertyName: propertyName, oldValue: oldValue, newValue: newValue }`

#### Example

``` JavaScript

Observe.property(model, ["property1","property2"], (params) => {

    console.log("property changed", params.propertyName);

    console.log("oldValue", params.oldValue);

    console.log("newValue", params.newValue);

})

```

### Observe.preFunction(object, functionName, callback)

Intercept a function call, before the function is executed. Can manipulate

arguments in the callback.

#### callback params

`{functionName: functionName, arguments: functionArguments}`

### Observe.postFunction(object, functionName, callback)

Intercept a function call, after the function is executed. Can manipulate

returnValue in callback. 

#### callback params

`{functionName: functionName, arguments: functionArguments, returnValue: returnValue}`