I'm new to angularjs and am writing my first directive. I've got half the way there but am struggling figuring out how to pass some variables to a directive.
My directive:
app.directive('chart', function () {
return{
restrict: 'E',
link: function (scope, elem, attrs) {
var chart = null;
var opts = {};
alert(scope[attrs.chartoptions]);
var data = scope[attrs.ngModel];
scope.$watch(attrs.ngModel, function (v) {
if (!chart) {
chart = $.plot(elem, v, opts);
elem.show();
} else {
chart.setData(v);
chart.setupGrid();
chart.draw();
}
});
}
};
});
My controller:
function AdListCtrl($scope, $http, $rootScope, $compile, $routeParams, AlertboxAPI) {
//grabing ad stats
$http.get("/ads/stats/").success(function (data) {
$scope.exports = data.ads;
if ($scope.exports > 0) {
$scope.show_export = true;
} else {
$scope.show_export = false;
}
//loop over the data
var chart_data = []
var chart_data_ticks = []
for (var i = 0; i < data.recent_ads.length; i++) {
chart_data.push([0, data.recent_ads[i].ads]);
chart_data_ticks.push(data.recent_ads[i].start);
}
//setup the chart
$scope.data = [{data: chart_data,lines: {show: true, fill: true}}];
$scope.chart_options = {xaxis: {ticks: [chart_data_ticks]}};
});
}
My Html:
<div class='row-fluid' ng-controller="AdListCtrl">
<div class='span12' style='height:400px;'>
<chart ng-model='data' style='width:400px;height:300px;display:none;' chartoptions="chart_options"></chart>
{[{ chart_options }]}
</div>
</div>
I can access the $scope.data in the directive, but I can't seem to access the $scope.chart_options data.. It's definelty being set as If I echo it, it displays on the page..
Any ideas what I'm doing wrong?
UPDATE:
For some reason, with this directive, if I move the alert(scope[attrs.chartoptions]); to inside the $watch, it first alerts as "undefined", then again as the proper value, otherwise it's always undefined. Could it be related to the jquery flot library I'm using to draw the chart?
Cheers,
Ben
One problem I see is here:
scope.$watch(attrs.ngModel, function (v) {
The docs on this method are unfortunately not that clear, but the first argument to $watch, the watchExpression, needs to be an angular expression string or a function. So in your case, I believe that you need to change it to:
scope.$watch("attrs.ngModel", function (v) {
If that doesn't work, just post a jsfiddle or jsbin.com with your example.
Related
I am trying to filter a list in using a click event in custom directive the filter works fine but how do I assign the filtered items so it is reflected in ng-repeat? Right now the list generated using ng-repeat on quesCompletedHeaders is not changed after the click event has taken place
app.directive('sectionSelector', ['$filter', 'questionnaireSections',
function ($filter, questionnaireSections) {
return {
restrict: 'A',
link: function (scope, iElement, iAttrs) {
iElement.on('click', function () {
scope.$apply(function () {
// filters correct question range
var filtered = $filter('rangeFilter')(scope.quesCompletedHeaders, [5, 10], true);
console.log(filtered); //=> This is correct how to put back on scope?
// There is an ng-repeat on quesCompletedHeaders in the template
// but nothing changes even when assigning filted results back
// on scope
scope.quesCompletedHeaders = filtered;
// works with $parent not sure why a child scope is
// created with the directive
scope.$parent.quesCompletedHeaders = filtered
});
});
}
};
}
]);
Ok I found out the reason sectionSelector is creating a child scope which should not be since scope:false is the default? why is this happening?
using scope.$parent.quesCompletedHeaders = filtered; solves the issue
Add scope 'quesCompletedHeaders' to directive
HTML
<hello-world sectionSelector="filtered.quesCompletedHeaders"></hello-world>
Javascript
app.controller('MainCtrl', function($scope) {
$scope.filtered.quesCompletedHeaders = {};
});
app.directive('sectionSelector', ['$filter', 'questionnaireSections',
function ($filter, questionnaireSections) {
return {
restrict: 'EA',
scope: {
questionnaireSections: "=",
},
link: function (scope, iElement, iAttrs) {
iElement.on('click', function () {
scope.$apply(function () {
// filters correct question range
var filtered = $filter('rangeFilter')(scope.quesCompletedHeaders, [5, 10], true);
console.log(filtered);
scope.filtered.quesCompletedHeaders = filtered;
});
});
}
};
}
]);
There is an easy alternative instead of directive.
you can have ng-click on the element and apply filter in controller to the list.
In HTML,
<input type="button" value="select section" ng-click="filterquestionaire(5,10)"/>
in Controller,
$scope.filterquestionaire = function(start,end) {
var filtered = $filter('rangeFilter')(scope.quesCompletedHeaders, [start, end], true);
$scope.quesCompletedHeaders = filtered;
};
OK so here is my final solution.
$scope.rangeFilter = function (range) {
$scope.quesRangeStart = range[0];
$scope.quesRangeEnd = range[1];
}
In the template I am piping the filter
ng-repeat="question in quesCompletedHeaders|rangeFilter:[quesRangeStart, quesRangeEnd]"
and on the filter buttons
ng-repeat="section in questionnaireSections"
ng-click="rangeFilter(section.range)"
and filter code
app.filter('rangeFilter', function () {
return function (items, rangeInfo) {
var min = parseInt(rangeInfo[0]);
var max = parseInt(rangeInfo[1]);
var filtered = items.filter(function (header) {
return header.rang >= min && header.rang <= max;
});
return filtered;
};
});
I want to be able to load the directive's template from a promise. e.g.
template: templateRepo.get('myTemplate')
templateRepo.get returns a promise, that when resolved has the content of the template in a string.
Any ideas?
You could load your html inside your directive apply it to your element and compile.
.directive('myDirective', function ($compile) {
return {
restrict: 'A',
link: function (scope, element, attrs) {
//Some arbitrary promise.
fetchHtml()
.then(function(result){
element.html(result);
$compile(element.contents())(scope);
}, function(error){
});
}
}
});
This is really interesting question with several answers of different complexity. As others have already suggested, you can put loading image inside directive and when template is loaded it'll be replaced.
Seeing as you want more generic loading indicator solution that should be suitable for other things, I propose to:
Create generic service to control indicator with.
Manually load template inside link function, show indicator on request send and hide on response.
Here's very simplified example you can start with:
<button ng-click="more()">more</button>
<div test="item" ng-repeat="item in items"></div>
.throbber {
position: absolute;
top: calc(50% - 16px);
left: calc(50% - 16px);
}
angular
.module("app", [])
.run(function ($rootScope) {
$rootScope.items = ["One", "Two"];
$rootScope.more = function () {
$rootScope.items.push(Math.random());
};
})
.factory("throbber", function () {
var visible = false;
var throbber = document.createElement("img");
throbber.src = "http://upload.wikimedia.org/wikipedia/en/2/29/Throbber-Loadinfo-292929-ffffff.gif";
throbber.classList.add("throbber");
function show () {
document.body.appendChild(throbber);
}
function hide () {
document.body.removeChild(throbber);
}
return {
show: show,
hide: hide
};
})
.directive("test", function ($templateCache, $timeout, $compile, $q, throbber) {
var template = "<div>{{text}}</div>";
var templateUrl = "templateUrl";
return {
link: function (scope, el, attr) {
var tmpl = $templateCache.get(templateUrl);
if (!tmpl) {
throbber.show();
tmpl = $timeout(function () {
return template;
}, 1000);
}
$q.when(tmpl).then(function (value) {
$templateCache.put(templateUrl, value);
el.html(value);
$compile(el.contents())(scope);
throbber.hide();
});
},
scope: {
text: "=test"
}
};
});
JSBin example.
In live code you'll have to replace $timeout with $http.get(templateUrl), I've used the former to illustrate async loading.
How template loading works in my example:
Check if there's our template in $templateCache.
If no, fetch it from URL and show indicator.
Manually put template inside element and [$compile][2] it.
Hide indicator.
If you wonder what $templateCache is, read the docs. AngularJS uses it with templateUrl by default, so I did the same.
Template loading can probably be moved to decorator, but I lack relevant experience here. This would separate concerns even further, since directives don't need to know about indicator, and get rid of boilerplate code.
I've also added ng-repeat and run stuff to demonstrate that template doesn't trigger indicator if it was already loaded.
What I would do is to add an ng-include in my directive to selectively load what I need
Check this demo from angular page. It may help:
http://docs.angularjs.org/api/ng.directive:ngInclude
````
/**
* async load template
* eg :
* <div class="ui-header">
* {{data.name}}
* <ng-transclude></ng-transclude>
* </div>
*/
Spa.Service.factory("RequireTpl", [
'$q',
'$templateCache',
'DataRequest',
'TplConfig',
function(
$q,
$templateCache,
DataRequest,
TplConfig
) {
function getTemplate(tplName) {
var name = TplConfig[tplName];
var tpl = "";
if(!name) {
return $q.reject(tpl);
} else {
tpl = $templateCache.get(name) || "";
}
if(!!tpl) {
return $q.resolve(tpl);
}
//加载还未获得的模板
return new $q(function(resolve, reject) {
DataRequest.get({
url : "/template/",
action : "components",
responseType : "text",
components : name
}).success(function(tpl) {
$templateCache.put(name, tpl);
resolve(tpl);
}).error(function() {
reject(null);
});
});
}
return getTemplate;
}]);
/**
* usage:
* <component template="table" data="info">
* <span>{{info.name}}{{name}}</span>
* </component>
*/
Spa.Directive.directive("component", [
"$compile",
"RequireTpl",
function(
$compile,
RequireTpl
) {
var directive = {
restrict : 'E',
scope : {
data : '='
},
transclude : true,
link: function ($scope, element, attrs, $controller, $transclude) {
var linkFn = $compile(element.contents());
element.empty();
var tpl = attrs.template || "";
RequireTpl(tpl)
.then(function(rs) {
var tplElem = angular.element(rs);
element.replaceWith(tplElem);
$transclude(function(clone, transcludedScope) {
if(clone.length) {
tplElem.find("ng-transclude").replaceWith(clone);
linkFn($scope);
} else {
transcludedScope.$destroy()
}
$compile(tplElem.contents())($scope);
}, null, "");
})
.catch(function() {
element.remove();
console.log("%c component tpl isn't exist : " + tpl, "color:red")
});
}
};
return directive;
}]);
````
How can i be notified when a directive is resized?
i have tried
element[0].onresize = function() {
console.log(element[0].offsetWidth + " " + element[0].offsetHeight);
}
but its not calling the function
(function() {
'use strict';
// Define the directive on the module.
// Inject the dependencies.
// Point to the directive definition function.
angular.module('app').directive('nvLayout', ['$window', '$compile', layoutDirective]);
function layoutDirective($window, $compile) {
// Usage:
//
// Creates:
//
var directive = {
link: link,
restrict: 'EA',
scope: {
layoutEntries: "=",
selected: "&onSelected"
},
template: "<div></div>",
controller: controller
};
return directive;
function link(scope, element, attrs) {
var elementCol = [];
var onSelectedHandler = scope.selected();
element.on("resize", function () {
console.log("resized.");
});
$(window).on("resize",scope.sizeNotifier);
scope.$on("$destroy", function () {
$(window).off("resize", $scope.sizeNotifier);
});
scope.sizeNotifier = function() {
alert("windows is being resized...");
};
scope.onselected = function(id) {
onSelectedHandler(id);
};
scope.$watch(function () {
return scope.layoutEntries.length;
},
function (value) {
//layout was changed
activateLayout(scope.layoutEntries);
});
function activateLayout(layoutEntries) {
for (var i = 0; i < layoutEntries.length; i++) {
if (elementCol[layoutEntries[i].id]) {
continue;
}
var div = "<nv-single-layout-entry id=slot" + layoutEntries[i].id + " on-selected='onselected' style=\"position:absolute;";
div = div + "top:" + layoutEntries[i].position.top + "%;";
div = div + "left:" + layoutEntries[i].position.left + "%;";
div = div + "height:" + layoutEntries[i].size.height + "%;";
div = div + "width:" + layoutEntries[i].size.width + "%;";
div = div + "\"></nv-single-layout-entry>";
var el = $compile(div)(scope);
element.append(el);
elementCol[layoutEntries[i].id] = 1;
}
};
}
function controller($scope, $element) {
}
}
})();
Use scope.$watch with a custom watch function:
scope.$watch(
function () {
return [element[0].offsetWidth, element[0].offsetHeight].join('x');
},
function (value) {
console.log('directive got resized:', value.split('x'));
}
)
You would typically want to watch the element's offsetWidth and offsetHeight properties. With more recent versions of AngularJS, you can use $scope.$watchGroup in your link function:
app.directive('myDirective', [function() {
function link($scope, element) {
var container = element[0];
$scope.$watchGroup([
function() { return container.offsetWidth; },
function() { return container.offsetHeight; }
], function(values) {
// Handle resize event ...
});
}
// Return directive definition ...
}]);
However, you may find that updates are quite slow when watching the element properties directly in this manner.
To make your directive more responsive, you could moderate the refresh rate by using $interval. Here's an example of a reusable service for watching element sizes at a configurable millisecond rate:
app.factory('sizeWatcher', ['$interval', function($interval) {
return function (element, rate) {
var self = this;
(self.update = function() { self.dimensions = [element.offsetWidth, element.offsetHeight]; })();
self.monitor = $interval(self.update, rate);
self.group = [function() { return self.dimensions[0]; }, function() { return self.dimensions[1]; }];
self.cancel = function() { $interval.cancel(self.monitor); };
};
}]);
A directive using such a service would look something like this:
app.directive('myDirective', ['sizeWatcher', function(sizeWatcher) {
function link($scope, element) {
var container = element[0],
watcher = new sizeWatcher(container, 200);
$scope.$watchGroup(watcher.group, function(values) {
// Handle resize event ...
});
$scope.$on('$destroy', watcher.cancel);
}
// Return directive definition ...
}]);
Note the call to watcher.cancel() in the $scope.$destroy event handler; this ensures that the $interval instance is destroyed when no longer required.
A JSFiddle example can be found here.
Here a sample code of what you need to do:
APP.directive('nvLayout', function ($window) {
return {
template: "<div></div>",
restrict: 'EA',
link: function postLink(scope, element, attrs) {
scope.onResizeFunction = function() {
scope.windowHeight = $window.innerHeight;
scope.windowWidth = $window.innerWidth;
console.log(scope.windowHeight+"-"+scope.windowWidth)
};
// Call to the function when the page is first loaded
scope.onResizeFunction();
angular.element($window).bind('resize', function() {
scope.onResizeFunction();
scope.$apply();
});
}
};
});
The only way you would be able to detect size/position changes on an element using $watch is if you constantly updated your scope using something like $interval or $timeout. While possible, it can become an expensive operation, and really slow your app down.
One way you could detect a change on an element is by calling
requestAnimationFrame.
var previousPosition = element[0].getBoundingClientRect();
onFrame();
function onFrame() {
var currentPosition = element[0].getBoundingClientRect();
if (!angular.equals(previousPosition, currentPosition)) {
resiszeNotifier();
}
previousPosition = currentPosition;
requestAnimationFrame(onFrame);
}
function resiszeNotifier() {
// Notify...
}
Here's a Plunk demonstrating this. As long as you're moving the box around, it will stay red.
http://plnkr.co/edit/qiMJaeipE9DgFsYd0sfr?p=preview
A slight variation on Eliel's answer worked for me. In the directive.js:
$scope.onResizeFunction = function() {
};
// Call to the function when the page is first loaded
$scope.onResizeFunction();
angular.element($(window)).bind('resize', function() {
$scope.onResizeFunction();
$scope.$apply();
});
I call
$(window).resize();
from within my app.js. The directive's d3 chart now resizes to fill the container.
Here is my take on this directive (using Webpack as bundler):
module.exports = (ngModule) ->
ngModule.directive 'onResize', ['Callback', (Callback) ->
restrict: 'A'
scope:
onResize: '#'
onResizeDebounce: '#'
link: (scope, element) ->
container = element[0]
eventName = scope.onResize || 'onResize'
delay = scope.onResizeDebounce || 1000
scope.$watchGroup [
-> container.offsetWidth ,
-> container.offsetHeight
], _.debounce (values) ->
Callback.event(eventName, values)
, delay
]
I'm writing a directive which recives a function as a parameter, the directive executes and run whatever is contained into the function.
the use case is:
the directive contains a link
when the user click the link the method passed as a parameter (from the controller) is executed
when the user hit the click button a spinner will show
the spinner will hide when the execution of the method is finished
my question is how can I defer the execution and bind it to a promise, to hide the spinner after the method execution.
for illustration purposes I have used $timeout that counts from 3 to 1, please take a look to the code I've done so far:
app.directive('toogleTextLink', function($compile,$q) {
return {
restrict: 'AE',
scope: { callback: "&targetMethod" },
template: '<div><a style="cursor: pointer" ><b>{{text}}</b></a>show value= {{show}} <br/><div ng-class="{previewLoader: show}"></div></div>',
link: function (scope, element, attr) {
scope.value = attr.value;
scope.show = false;
scope.$watch('value', function () {
if (scope.value) {
scope.text = "yes";
} else {
scope.text = "no";
}
});
element.bind('click', function () {
scope.show = true;
scope.value = !scope.value;
scope.$digest();
if (scope.callback) {
var deferred = $q.defer(scope.callback());
deferred.promise.then(function () {
scope.show = false;
console.log("then called");
});
}
});
}
};
});
app.controller('myCtrl', function($scope,$timeout,$q) {
$scope.IsFacebookConnected = false;
$scope.countDown = 3;
$scope.authSocial = function(value, socialNetwork) {
switch (socialNetwork) {
case "facebook":
$scope.IsFacebookConnected = !value;
}
runCounter = function() {
$scope.countDown -= 1;
if ( $scope.countDown > 0)
$timeout(runCounter, 1000);
console.log("timer");
};
runCounter();
};
});
this is the plunker as well.
Andy Joslin wrote a "promise tracker" which does exactly what you need. It even has some sugar for $http integration. Basically you add "promises" to it, and it tells you the execution state. You can then bind that execution state to ng-show on something like a loading spinner animation. https://github.com/ajoslin/angular-promise-tracker and here's a demo: http://plnkr.co/edit/3uAe0NdXLz1lCYlhpaMp?p=preview
Your code will look something like:
$scope.tracker = promiseTracker("socialtracker");
$scope.tracker.addPromise(somePromise);
And in your view:
<div ng-show="tracker.active()">Loading...</div>
I'm new to Angular, and I'm trying to get the XY coordinates of a tap using angular-hammer.js directives. Here's how the directives are set up:
var hmTouchevents = angular.module('hmTouchevents', []),
hmGestures = ['hmHold:hold',
'hmTap:tap',
'hmDoubletap:doubletap',
'hmDrag:drag',
'hmDragup:dragup',
'hmDragdown:dragdown',
'hmDragleft:dragleft',
'hmDragright:dragright',
'hmSwipe:swipe',
'hmSwipeup:swipeup',
'hmSwipedown:swipedown',
'hmSwipeleft:swipeleft',
'hmSwiperight:swiperight',
'hmTransform:transform',
'hmRotate:rotate',
'hmPinch:pinch',
'hmPinchin:pinchin',
'hmPinchout:pinchout',
'hmTouch:touch',
'hmRelease:release'];
angular.forEach(hmGestures, function(name){
var directive = name.split(':'),
directiveName = directive[0],
eventName = directive[1];
hmTouchevents.directive(directiveName, ["$parse", function($parse) {
return {
scope: true,
link: function(scope, element, attr) {
var fn, opts;
fn = $parse(attr[directiveName]);
opts = $parse(attr["hmOptions"])(scope, {});
scope.hammer = scope.hammer || Hammer(element[0], opts);
return scope.hammer.on(eventName, function(event) {
return scope.$apply(function() {
return fn(scope, {
$event: event
});
});
});
}
};
}
]);
});
My html looks like this:
<div ng-controller="IndexCtrl" >
<div class='tap-area' hm-tap="tap();">
</div>
</div>
My controller looks like this:
App.controller('IndexCtrl', function ($scope, Myapp) {
$scope.tap = function(ev){
//How do I get the event.gesture.center.pageX in here?
};
});
I figured out how to make this work. After return scope.hammer.on(eventName, function(event) { I added scope.event = event; and then in my controller I can get XY coords of a tap by using this.event.center.pageX or this.event.center.pageY.
It was posted long time ago but here is another solution.
Just add $event to your html