133 lines
3.9 KiB
JavaScript
133 lines
3.9 KiB
JavaScript
/* angularjs Scroll Glue
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* version 2.0.6
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* https://github.com/Luegg/angularjs-scroll-glue
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* An AngularJs directive that automatically scrolls to the bottom of an element on changes in it's scope.
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*/
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(function(angular, undefined){
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'use strict';
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function createActivationState($parse, attr, scope){
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function unboundState(initValue){
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var activated = initValue;
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return {
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getValue: function(){
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return activated;
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},
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setValue: function(value){
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activated = value;
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}
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};
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}
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function oneWayBindingState(getter, scope){
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return {
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getValue: function(){
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return getter(scope);
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},
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setValue: function(){}
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}
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}
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function twoWayBindingState(getter, setter, scope){
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return {
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getValue: function(){
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return getter(scope);
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},
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setValue: function(value){
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if(value !== getter(scope)){
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scope.$apply(function(){
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setter(scope, value);
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});
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}
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}
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};
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}
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if(attr !== ""){
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var getter = $parse(attr);
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if(getter.assign !== undefined){
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return twoWayBindingState(getter, getter.assign, scope);
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} else {
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return oneWayBindingState(getter, scope);
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}
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} else {
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return unboundState(true);
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}
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}
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function createDirective(module, attrName, direction){
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module.directive(attrName, ['$parse', '$window', '$timeout', function($parse, $window, $timeout){
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return {
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priority: 1,
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restrict: 'A',
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link: function(scope, $el, attrs){
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var el = $el[0],
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activationState = createActivationState($parse, attrs[attrName], scope);
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function scrollIfGlued() {
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if(activationState.getValue() && !direction.isAttached(el)){
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direction.scroll(el);
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}
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}
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scope.$watch(scrollIfGlued);
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$timeout(scrollIfGlued, 0, false);
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$window.addEventListener('resize', scrollIfGlued, false);
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$el.bind('scroll', function(){
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activationState.setValue(direction.isAttached(el));
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});
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}
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};
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}]);
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}
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var bottom = {
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isAttached: function(el){
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// + 1 catches off by one errors in chrome
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return el.scrollTop + el.clientHeight + 1 >= el.scrollHeight;
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},
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scroll: function(el){
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el.scrollTop = el.scrollHeight;
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}
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};
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var top = {
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isAttached: function(el){
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return el.scrollTop <= 1;
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},
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scroll: function(el){
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el.scrollTop = 0;
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}
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};
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var right = {
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isAttached: function(el){
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return el.scrollLeft + el.clientWidth + 1 >= el.scrollWidth;
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},
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scroll: function(el){
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el.scrollLeft = el.scrollWidth;
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}
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};
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var left = {
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isAttached: function(el){
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return el.scrollLeft <= 1;
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},
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scroll: function(el){
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el.scrollLeft = 0;
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}
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};
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var module = angular.module('luegg.directives', []);
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createDirective(module, 'scrollGlue', bottom);
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createDirective(module, 'scrollGlueTop', top);
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createDirective(module, 'scrollGlueBottom', bottom);
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createDirective(module, 'scrollGlueLeft', left);
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createDirective(module, 'scrollGlueRight', right);
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}(angular));
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