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February 8, 2021 11:26
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Auto Grow/Shrink textarea directive for AngularJS (credits to this gist https://gist.github.com/thomseddon/4703968, specially @huyttq)
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angular.module("myApp").directive("autoGrow", function(){ | |
return function(scope, element, attr){ | |
var update = function(){ | |
element.css("height", "auto"); | |
var height = element[0].scrollHeight; | |
if(height > 0){ | |
element.css("height", height + "px"); | |
} | |
}; | |
scope.$watch(attr.ngModel, function(){ | |
update(); | |
}); | |
attr.$set("ngTrim", "false"); | |
}; | |
}); |
@muratsplat
Excellent Work! Thanks!
In case someone uses debounced model updates - this will just work with a timeout, which is not very nice, so i changed the code a bit to also listen to the input event:
angular.module('myApp').directive('autogrow', function () {
return {
restrict: 'A',
link: function (scope, element, attrs) {
// hide scroll of textarea
element.css('overflow', 'hidden');
var autogrow = function () {
element.css('height', 'auto');
var height = element[0].scrollHeight;
if(height > 0){
element.css('height', height + 'px');
}
};
// using 'input' event on element, because of debounced model update
element.on('input', autogrow);
// need this too, for initialize
scope.$watch(attrs.ngModel, autogrow);
}
};
});
@lpsBetty
Your trick of binding input
event is great! Thanks.
PS:
I was implementing autogrowing
textarea in ionic 1
modal template while I should consider a delay effect of modal opening. So I added a modal.shown
watcher.
angular.module('myApp').directive('autogrow', function () {
return {
restrict: 'A',
link: function (scope, element, attrs) {
// hide scroll of textarea
element.css('overflow', 'hidden');
var autogrow = function () {
element.css('height', 'auto');
var height = element[0].scrollHeight;
if(height > 0){
element.css('height', height + 'px');
}
};
// using 'input' event on element, because of debounced model update
element.on('input', autogrow);
// need this too, for initialize
scope.$watch(attrs.ngModel, autogrow);
/////////////////////////////////////////////////
// apply after modal is shown <- ADD HERE
scope.$on('modal.shown', autogrow);
}
};
});
Hope this might help someone.
in case textarea is not yet visible:
if(!element.is(':visible')) {
scope.$watch(function () { return element.is(':visible'); }, function (visible) {
if(visible) {
autogrow();
scope.$applyAsync();
}
});
}
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Thank you ! works for me too.