I'm using AngularJS for an external web project.
I'm stuck with the update interval of the page as the JSON data I get is from the html div from inside the page, JSON data is being sent from policy.
I'm using
$scope.json_data = angular.element(document).find('#idofthejsondiv').html();
The div gets different JSON data for every 'x' seconds.
How can I update the page on the change in the divs value?
try this:
$scope.$watch (
function () {
return angular.element(document).find('#idofthejsondiv').html();
},
function (newValue) {
console.log (newValue);
// do stuff with the new value...
}
);
but it has to be mentioned that this doesn't seem like a appropriate structure of your app. the data in the div has to be changed somewhere somehow by some service. the better approach would be to intercept this service whenever it puts the changes to the div and do whatever you want with that new content
Related
In my angular app, there are two pages (list & checkout). In the list page the user could search for an item and the searched item will be displayed and then the user can select the item and continue to checkout.
From the checkout page the user could return back to list page, and at that time all the items in the list page should be same as how it was left before.
For implementing this feature, my code is
on moving from list page to checkout page, all the scope data are stored in a service
returnsService.setScopeData($scope);
And on returning back from checkout page to list page, this saved data are retrieved from service and assigned to scope variables.
var restoreScopeData = returnsService.getScopeData();
if (restoreScopeData) {
for (var key in restoreScopeData) {
if (key.charAt(0) != '$') {
$scope[key] = restoreScopeData[key];
}
}
}
This works fine to an extend, and I can see the list page same as how I left it.
But the problem is, now I'm not able to search for new item in the list page.
When ever a search happens, the items are populated to $scope.listSearch and they are displayed in html {{listSearch}}.
In the error case also,
I can see the new search data getting assigned to the $scope.listSearch, but the HTML binding is not happening.
I tried calling $scope.$apply() after the search assigning, but still not working.
Storing complete scope isn't good idea. You can just store the vars you need. Also, you can use localStorage for this.
As I understood, making new call is not an option, so you can try use $timeout.
$timeout(function() {
$scope.listSearch = myValue;
});
Instead of doing this, you may for localStorage or sessionStorage as suggsted by John.
You may check below link for example
https://www.codeproject.com/Articles/1015515/Working-With-Client-Side-Local-Storage
I have been playing around with the $location service in angular, with trying to pass certain values to $routeParams to filter a set of items based on multiple conditions like colour, style, category and so forth
My API has a set of filters it can manipulate a group of objects by and one is 'IN' so for example if I want the the API to only return Blue, Red & Green I can do the following:
filter[]=product_colours,in,red,blue,green
If i wanted to just get a certain set of styles in them colours I can do
filter[]=product_colours,in,red,blue,green&filter[]=product_sub_category,in,Long,Short,Slim
I have put together a CodePen trying to prototype my idea of filtering:
CodePen example: http://codepen.io/sutsurikeru1986/pen/YqaeeO
What I am trying to do, but I am having issues with, is trying to maintain the values passed to the query string using &location.search() to be maintained after a page refresh and passing such values to $routeParams so my route can understand the it - as well as preventing the query string from becoming:
?key=param1&key=param2&key=param3
Instead of something a little cleaner like:
?key=param1-param2-param3
Any help to point me in the right direction would be greatly appreciated.
I use this process to save a state object to HTML5 local storage when the page is refreshed or closed. Then I reload the state in the controller (or a factory if you wish) when the page reloads.
// get the state object from local storage
$scope.state = angular.fromJson(localStorage.getItem(id));
// make sure state is an object
$scope.state = (angular.isObject($scope.state)) ? $scope.state : {};
// update your route params in the state object
$scope.state.selectors = $routeParams.selectors;
// when the page refreshes or is closed angular broadcasts a "$destroy" message
$scope.$on("$destroy", function() {
// save the route to html5 local storage
localStorage.setItem("some_state_id", angular.toJson($scope.state));
});
I am calling $http.get to get new content from the server for angular ui grid. On change of date in the datepicker I trigger an ng-change event to make another http call to get new content. The call is successful but the grid is not updated with new content.$scope.grid.core.notifyDataChange() throws error when called inside the http success call back.Please suggest ways to update the grid with new content.
Please find the plnkr code. when I click load button, I want to update grid with new JSON data using http call but it is not updating grid. http://plnkr.co/edit/S2A3scEoO6QIGFbru3Lr?p=preview
The problem with your example is inside $http's success method(lines 256-260).
$http.get(...).success(
function(data){
$scope.roData = data;
});
There you are just putting your data inside a scope property ($scope.roData), but then you're not doing anything with that scope property.
Furthermore you're trying to assign a wrong value to uiGrid.gridOptions.data with the lines:
if($scope.gridOptions.data ==='rData'){
$scope.gridOptions.data = 'roData';
}
But you did 2 mistakes:
Treating variables as string, and this is not going to work. Inside your JS files you need to access your scope with $scope.nameOfVariable not by using their names as strings like 'nameOfVariable'.
You put these lines outside of your success method, so they are executed before you actually get your data.
I managed to edit your plunker and make it work, you can find it here.
What I did was putting your lines together and fix the name error. I did not put there any if since I don't know what logic you wanted to accomplish.
$http.get(...).success(
function(data){
$scope.roData = data;
$scope.gridOptions.data = $scope.roData;
});
Sorry for a not very specific question by someone new to node webkit, new to Angular, new to about everything in web development:
My app is based on a JSON file that I load at the init of my node webkit app and which is at the center of a bunch of calculations.
In the app, one can open a file dialog to create a new JSON file. Now, of course, I would like the app to recalculate everything based on the new JSON. It works when I press the "refresh" button of node webkit, but I couldn't get it running by using either
require('nw.gui').Window.open('index.html');
nor
require('nw.gui').Window.get().reload(3);.
I am also wondering if handling this on the node level is the good way to do it. Shouldn't it rather be done by Angular? But I couldn't really connect to the content of my controller from an "outside" javascript.
Grateful for any hint...
Having logic on the page loading is always tricky and as you mentioned - requires page reloading what is not very elegant and modern applications avoid this.
In your case, I suggest that if your JSON file is not very big - store it in variable and modify it as needed. The elegant way will be to create Angular service, which can act as a "model".
angular.service('JsonService', function() {
var json = {
// content
};
return {
getJson: function () {
return json;
},
setJson: function (newJson) {
json = newJson;
}
};
});
Then, whenever you need to update JSON invoke setJson(newJson) method and modify your controllers to use the service getJson() method.
You can also add the loading/saving to file functions to this service. The loading function can be invoked in your main controller connected to your dashboard page. Then before the first page will be visible, the JSON file will be already loaded and you preserve desired behavior.
I am currently making an application in angular which does this:
(On page load) Make an api call in angular controller (to symfony2 end point) to get: items.
$scope.items = ItemsService.query(function(data){
$scope.loading = false;
}, function(err){
$scope.loading = false;
});
items is an array containing many item objects.
Each item contains parameters e.g. item.param1 item.param2.
I have built it in a similar way to this tutorial:
http://www.sitepoint.com/creating-crud-app-minutes-angulars-resource/
i.e. The angular controller calls a service which calls the (symfony2) backend api endpoint.
The endpoint passes back items which is gets from a database. Items are then put into the view using ng-repeat (item in items).
This all works fine.
Now, I have a button (in the ng-repeat) which effectively causes a PUT request to be made to (another symfony2 endpoint), thus updating item.param1in the database. This also happens in the tutorial I linked to.
The problem is that (in my application and in the tutorial) I have to again make an api call which updates ALL the items, in order to see the change.
I want to just update the data in the view (immediately) for one object without having to fetch them all again.
i.e. something like:
$scope.items[4] = Items.get({id: item.id}, function(){});
Except the application array key isn't known so I cant do that.
(so something like: $scope.items.findTheOriginalItem(item) = Items.get({id: item.id}, function(){});.
Another possible solution (which seems like it may be the best?). I have looked here:
http://teropa.info/blog/2014/01/26/the-three-watch-depths-of-angularjs.html
And tried doing the equality $watch: $scope.$watch(…, …, true);. Thus using watch to see when the item sub-array is updated. This doesn't seem to update the data in the view though (even though it is updating in the database).
Any advice on the best way of doing this (and how to do it) would be great! Thanks!
Essentially the button click should use ng-click to execute a function and pass the item to that function. Example:
...ng-repeat="item in items"...
<button type="button" ng-click="updateItem(item)">Update</button
...
Then in the function you have the exact item that you want to update. If you are using $resources, it would be something like:
$scope.updateItem = function(item) { item.$update(...); };
Unless I didn't understand you