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AngularJS 1.x directive for auto-grow / auto-resize of textarea elements.

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angularjs-autogrow autosize autogrow expand textarea

angularjs-autogrow's Introduction

angularjs-autogrow

AngularJS directive for auto-grow / auto-resize of textarea elements on typing.

Works in all cases: expands on line breaks and word breaks.
Great Performance: minimal DOM manipulation and no watchers.
Allows limitation of auto-growing so a scrollbar will appear after X lines of content.

Installation via NPM

npm install angularjs-autogrow --save

Usage:

Include angular-autogrow.min.js file in <head> section of the HTML:

<script type="text/javascript" src="angularjs-autogrow.min.js"></script>

Include angularjs-autogrow dependency in your angular module:

var app = angular.module("app", ["angularjs-autogrow"]);

It's also recommended to add those two CSS properties to make things stable:

textarea {
	resize: none;
	box-sizing: content-box;
}

Add the directive to the textarea element:

<textarea autogrow></textarea>

More Options:

Limit Autogrow Lines

You can limit the auto-growing of the textarea element by using max-lines attribute:

<textarea autogrow max-lines="3"></textarea>

Set Initial Rows

You can set the initial line number using rows attribute:

<textarea autogrow rows="1"></textarea>

Autogrow on css properties change

You can define which CSS properties have to be watched in order to trigger the auto-growing:

<textarea autogrow="font-family,font-size"></textarea>

angularjs-autogrow's People

Contributors

Stargazers

Watchers

Forkers

lidorarviv iday jillchen emilespecs rgecy cormacwia jaakritso the-software-factory fabianraf jayeshbhalodia steveswartz shuangxuqiu sendergen in8finity polpware-angularjs

angularjs-autogrow's Issues

Doesn't update on directive load with pre-existing text

Hi,
I was having an issue with the directive (very good, by the way!) when put inside another directive and then having initial text on page load.

I fixed this using a $timeout in the autogrowFn call and changing the event listener.

I hope it may help other users :)

(function(){
    'use strict';
    angular.module('angular-autogrow', []).directive('autogrow', ['$window', '$timeout', function($window, $timeout){
        return {
            link: function($scope, $element, $attrs){

                /**
                 * Default settings
                 */
                $scope.attrs = {
                    rows: 1,
                    maxLines: 999
                };

                /**
                 * Merge defaults with user preferences
                 */
                for(var i in $scope.attrs){
                    if($attrs[i]){
                        $scope.attrs[i] = parseInt($attrs[i]);
                    }
                }

                /**
                 * Calculates the vertical padding of the element
                 * @returns {number}
                 */
                $scope.getOffset = function(){
                    var style = $window.getComputedStyle($element[0], null),
                        props = ['paddingTop', 'paddingBottom'],
                        offset = 0;

                    for(var i=0; i<props.length; i++){
                        offset += parseInt(style[props[i]]);
                    }
                    return offset;
                };

                /**
                 * Sets textarea height as exact height of content
                 * @returns {boolean}
                 */
                $scope.autogrowFn = function(){
                    $timeout(function() {
                        var newHeight = 0, hasGrown = false;
                        if (($element[0].scrollHeight - $scope.offset) > $scope.maxAllowedHeight) {
                            $element[0].style.overflowY = 'scroll';
                            newHeight = $scope.maxAllowedHeight;
                        }
                        else {
                            $element[0].style.overflowY = 'hidden';
                            $element[0].style.height = 'auto';
                            newHeight = $element[0].scrollHeight - $scope.offset;
                            hasGrown = true;
                        }
                        $element[0].style.height = newHeight + 'px';
                        return hasGrown;
                    });
                };

                $scope.offset = $scope.getOffset();
                $scope.lineHeight = ($element[0].scrollHeight / $scope.attrs.rows) - ($scope.offset / $scope.attrs.rows);
                $scope.maxAllowedHeight = ($scope.lineHeight * $scope.attrs.maxLines) - $scope.offset;

                $scope.$watch($attrs.ngModel, $scope.autogrowFn);
                /**
                 * Auto-resize when there's content on page load
                 */
                if($element[0].value !== ''){
                    $scope.autogrowFn();
                }
            }
        }
    }]);
})();

Please note that I know it should be a Pull Request, but I didn't have the possibility to do this when I found the fix at work ;)

Auto-resize on load?

Is there a way to possibly have the textarea boxes autogrow to fit the value already in them when the page/view loads with them in it?

text jump issue in IE 11

the textarea size is causing the text to jump momentarily in IE 11 with enter key pressed

Very slow when typing and holding specific key

The rendering of the text in the textarea is very slow when you are trying to type and holds a specific key only (example: try to type aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)

I found out that there is an issue in this part:

setting the height of the textarea to auto then setting it again to new height.

should this component still work?

I have created a new app with the angular fullstack generator, and tried to use this component, but does not work at all.

Cool component. I am able to use it on a "regular" scenario but - I have a chat page, similar to how WhatsApp looks in which the text area is at the bottom and I want it to expand upwards and not downwards.

Is there a way to do it?

I've seen this example that does so but I am not able to get it to work within my angular app :-(

Thanks!

Missing License info

can the owners please add license information for using this library.

As per this Gitbub licensing guideline-
https://blog.github.com/2015-03-09-open-source-license-usage-on-github-com/

Unless you’ve explicitly told others that they can modify and reuse your work, you’ve only showed others your code; you haven’t shared it.

contenteditable div with autogrow does not work in IE 11

I am trying to use autogrow with a contenteditable div and it works fine with Chrome and Firefox but I so far cannot seem to get it to work with IE11.

Height should be updated if the font-family changes

A textarea could be used with different font-families. Height changes should be triggered everytime font-family changes.