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@jetbrains/angular-elastic

v2.5.1

Published

Elastic (autosize) textareas for AngularJS, without jQuery dependency.

Downloads

1,097

Readme

Angular Elastic

Elastic (autosize) textareas for AngularJS, without jQuery dependency.

See it in action.

Usage

as attribute

<textarea msd-elastic ng-model="foo">
  ...
</textarea>

as class

<textarea class="msd-elastic" ng-model="bar">
  ...
</textarea>

optionally append whitespace to the end of the height calculation (an extra newline improves the apperance when animating)

<textarea msd-elastic="\n" ng-model="foo">
  ...
</textarea>

<textarea class="msd-elastic: \n;" ng-model="bar">
  ...
</textarea>

or configure whitespace globally

app.config(['msdElasticConfig', function(msdElasticConfig) {
  msdElasticConfig.append = '\n';
}])

the directive also emits an elastic:resize event which you can listen for

$scope.$on('elastic:resize', function(event, element, oldHeight, newHeight) {
  // do stuff
});

Single line textareas

Set the rows attribute to 1, as browsers default to 2.

<textarea rows="1" msd-elastic ng-model="foo">
  ...
</textarea>

Install

bower install angular-elastic

npm install angular-elastic

Include the elastic.js script provided by this component in your app.

Make sure to add monospaced.elastic to your app’s module dependencies.

angular
  .module('yourApp', [
    'monospaced.elastic'
  ]);

Support

Modern browsers only—Internet Explorer 6, 7 & 8 retain their default textarea behaviour.

Demo

How it works

By creating a hidden textarea that mirrors the textarea to which the directive was applied, Angular Elastic can measure the required height and adjust the textarea accordingly. Adjustments are done on:

  • Keystroke events
  • Window resize events
  • Model changes

This works well in most cases with no additional code required other than described in the Usage section above. However, it may occur that the adjustment must be invoked manually at a time that is not covered by the events listed above. E.g. textareas with the style display: none; may not have a valid width in Safari which produces incorrect adjustments. In this case the adjustment needs to be invoked once these textareas become visible. For that Angular Elastic listens to the elastic:adjust event on its scope. To invoke the adjustment for all textareas covered by Angular Elastic use:

$rootScope.$broadcast('elastic:adjust');

Inspiration