问题
I am pretty new to ionic and working on an app where you load a bunch of categories ,followed by a list of items in the category and when you click on the item in the category a documenturl loads containing the content which is basically an image. Currently, everything loads fine, but I would like to preload the content the moment my category is visible, so even if I go offline I should be able to click on any of the items within the category list and load the respective document. I looked online but I couldn't find anything except localstorage which caches data after you have visited it and not before. Is there a way I can pre-load or pre-cache content ?
Here's my code for controllers:
angular.module('starter.controllers', ["utility.services"])
.directive("bindCompiledHtml", ["$compile", "zoomPerOrientation", function($compile, zoomPerOrientation) {
return {
template: '<div></div>',
scope: {
rawHtml: '=bindCompiledHtml'
},
link: function(scope, elem, attrs) {
scope.$watch('rawHtml', function(value) {
if (!value) return;
var newElem = $compile(value)(scope.$parent);
elem.contents().remove();
zoomPerOrientation.zoomTo('docScroll');
elem.append(newElem);
elem.bind("click", function(e) {
e.stopPropagation();
e.preventDefault();
if (e.target.tagName === 'A') {
window.open(encodeURI(e.target.href), '_system', "presentationstyle=fullscreen,closebuttoncaption=close,location=no,transitionstyle=fliphorizontal");
return false;
} else if (e.target.parentNode.tagName === 'A') {
window.open(encodeURI(e.target.parentNode.href), '_system', "presentationstyle=fullscreen,closebuttoncaption=close,location=no,transitionstyle=fliphorizontal");
return false;
}
});
});
}
};
}])
.directive('setHeight', function($window) {
return {
link: function(scope, element, attrs) {
element.css('height', $window.innerHeight + 30);
}
}
})
.controller("MenuCtrl", ["$scope", "MenuService", "$stateParams", "$state", "ConfigUrls", function($scope, MenuService, $stateParams, $state, ConfigUrls) {
// debugger;
console.log("MenuCtrl");
$scope.menuData = [];
$scope.noMenuDataMsg = "Loading....";
$scope.LoadMenu = function(forceLoad) {
console.log("MenuCtrl - LoadMenu");
// console.log(MenuService.getClinicalAreas(forceLoad));
MenuService.getClinicalAreas(forceLoad).then(function(data) {
$scope.menuData = data;
}, function(err) {
console.log(err);
if (err.error === "timeout") {
$scope.noMenuDataMsg = "Error: Unable to retrieve data due to network error! Please try again when you are in network."
} else {
$scope.noMenuDataMsg = "Error retrieving data! Please contact system administrator."
}
$scope.menuData = [];
}).finally(function() {
$scope.$broadcast('scroll.refreshComplete');
});
}
$scope.deviceModel = window.localStorage.getItem("deviceModel");
// console.log(MenuService);
// console.log($scope.menuData);
$scope.title = $stateParams.topTitle;
var metaTag = $stateParams.metaTag;
//console.log(ConfigUrls[metaTag+"Published"]);
if (metaTag !== "") {
window.localStorage.setItem('publishedUrl', ConfigUrls[metaTag + "Published"]);
window.localStorage.setItem('docUrl', ConfigUrls[metaTag + "DocUrl"]);
window.localStorage.setItem('cacheKeyPrefix', metaTag);
$scope.LoadMenu(false);
} else {
$scope.noMenuDataMsg = "Under Construction!";
}
//console.log("metaTag",metaTag);
//if ($stateParams.topTitle === "Transplant") {
// $scope.LoadMenu(false);
//}
//else {
// $scope.noMenuDataMsg = "Under Construction!";
//}
$scope.showHomeItem = function(clinicalArea) {
console.log("MenuCtrl - showHomeItem");
$state.go('contr.home', {
cA: clinicalArea
});
}
$scope.goHome = function() {
console.log("MenuCtrl - goHome");
$state.go('contr.topmenu');
}
}])
.controller("HomeCtrl", ["$scope", "HomeService", "$stateParams", "$state", function($scope, HomeService, $stateParams, $state) {
console.log("HomeCtrl");
$scope.organs = [];
$scope.title = $stateParams.cA;
$scope.LoadHome = function(forceLoad) {
console.log("HomeCtrl - LoadHome");
HomeService.getOrgans($stateParams.cA, forceLoad).then(function(data) {
$scope.organs = data;
}, function(err) {
$scope.organs = [];
}).finally(function() {
$scope.$broadcast('scroll.refreshComplete');
});
}
$scope.showLevel2Item = function(title, clinicalArea) {
console.log("HomeCtrl - showLevel2Item");
$state.go('contr.level2', {
title: title,
cA: clinicalArea
});
//:title/:cA
}
$scope.goHome = function() {
console.log("HomeCtrl - goHome");
$state.go('contr.topmenu');
}
$scope.LoadHome(false);
}])
.controller('Level2Ctrl', ["$scope", "OrganService", "$stateParams", "$state", function($scope, OrganService, $stateParams, $state) {
$scope.title = "Level2 ";
console.log("Level2Ctrl");
$scope.parentOrgan = {};
$scope.viewTitle = $stateParams.title;
OrganService.getSingleOrganDetail($stateParams.cA, $stateParams.title).then(function(data) {
$scope.parentOrgan = data[0];
$scope.parentOrgan.clinicalAreaDisp = "Transplant";
}, function(err) {
$scope.parentOrgan = {};
});
console.log($scope.parentOrgan);
$scope.subGroup = [];
$scope.LoadSubGroups = function(forceLoad) {
console.log("Level2Ctrl - LoadSubGroups");
OrganService.getSubGroups($stateParams.title, $stateParams.cA, forceLoad).then(function(data) {
$scope.subGroup = data;
console.log("$scope.subGroup", $scope.subGroup);
}, function(err) {
$scope.subGroup = [];
}).finally(function() {
$scope.$broadcast('scroll.refreshComplete');
});
}
//$scope.deviceModel = window.localStorage.getItem("deviceModel");
//$scope.devicePlatform = window.localStorage.getItem("devicePlatform");
$scope.toggleGroup = function(group) {
group.show = !group.show;
};
$scope.isGroupShown = function(group) {
return group.show;
};
$scope.showDocumentDtl = function(id, docTitle, sgName, mnGroup, area) {
console.log("Level2Ctrl - showDocumentDtl");
$state.go('contr.doc-dtl', {
id: id,
docTitle: docTitle,
sgName: sgName,
mnGroup: mnGroup,
area: area
});
//:title/:cA
}
$scope.goHome = function() {
console.log("Level2Ctrl - goHome");
$state.go('contr.topmenu');
}
$scope.LoadSubGroups();
}])
.controller('DocumentCtrl', ["$scope", "DocmentService", "zoomPerOrientation", "$stateParams", "$ionicScrollDelegate", "$state", function($scope, DocmentService, zoomPerOrientation, $stateParams, $ionicScrollDelegate, $state) {
$scope.viewData = {};
$scope.snippet = "<p style='margin-top:40%;margin-left:40%;font-weight:bold;font-size:1.6em;' class='item item-stable'>Loading...</p>";
$scope.statusMessage = "";
$scope.title = $stateParams.mnGroup;
console.log("DocumentCtrl");
console.log("$stateParams", $stateParams);
//, $stateParams.docTitle, $stateParams.sgName, $stateParams.mnGroup, $stateParams.area
// console.log("Inside docuemtn controller");
$scope.LoadDocument = function(forceLoad) {
console.log("DocumentCtrl - LoadDocument");
DocmentService.getRowDocument($stateParams.id, $stateParams.docTitle, $stateParams.sgName, $stateParams.mnGroup, $stateParams.area, forceLoad).then(
function(data) {
// console.log("successfull", data);
$scope.viewData = data;
$scope.snippet = $scope.viewData.document;
},
function(reason) {
// console.log("Error Occured", reason);
$scope.viewData = {
"docTitle": "Error Occured!"
};
if (reason.error === "timeout") {
$scope.snippet = "<div style='margin-top:40%;margin-left:15%;font-weight:bold;font-size:1.6em;width:600px !important;padding:16px !important;line-height:120%;' class='item item-stable item-text-wrap item-complex'>Error: Unable to the load the document at this time. Please make sure you are in the network or you have already fetched the document while you were in the network!</div>";
}
// $scope.statusMessage = err;
}).finally(function() {
console.log("finally", data);
$scope.$broadcast('scroll.refreshComplete');
});
}
//below code would be refactored in near future.
//It is not a good practice adding window event listener in the controller
window.addEventListener('orientationchange', function() {
try {
if ($ionicScrollDelegate.$getByHandle('docScroll')._instances.length > 2) {
zoomPerOrientation.zoomTo('docScroll');
}
} catch (exception) {
console.log(exception);
}
});
$scope.goHome = function() {
console.log("DocumentCtrl - goHome");
$state.go('contr.topmenu');
}
$scope.LoadDocument(true);
}])
.controller('TopMenuCtrl', ["$scope", "TopMenuService", "$state", "$ionicHistory",
function($scope, TopMenuService, $state, $ionicHistory) {
$ionicHistory.clearHistory();
$scope.title = "Rules";
$scope.menuItems = [];
$scope.menuItemsLandscape = [];
$scope.flatMenuItems = [];
$scope.tileView = true;
$scope.listView = false;
$scope.portraitMode = true;
console.log("TopMenuCtrl");
TopMenuService.getMenuItems().then(function(data) {
$scope.menuItems = data.colData;
$scope.flatMenuItems = data.flatData;
$scope.menuItemsLandscape = data.threeColData;
console.log($scope.menuItems);
},
function() {
$scope.menuItems = [];
});
$scope.showMenuItem = function(title, metaTag) {
console.log("TopMenuCtrl - showMenuItem");
//$state.go('tab.menu', { topTitle: title });
$state.go('contr.menu', {
topTitle: title,
metaTag: metaTag
});
}
$scope.itemChanged = function() {
console.log("TopMenuCtrl - itemChanged");
console.log($scope.tileView);
if ($scope.tileView) {
$scope.listView = true;
$scope.tileView = false;
} else {
$scope.listView = false;
$scope.tileView = true;
}
}
// console.log(window.orientation);
function onChangeOrientation() {
console.log("TopMenuCtrl - onChangeOrientation");
try {
//landscape mode
// console.log("Orientation Changed");
if (window.orientation === 90 || window.orientation == -90) {
$scope.portraitMode = false;
}
//portrait
else {
$scope.portraitMode = true;
}
} catch (exception) {
console.log(exception);
}
}
onChangeOrientation();
window.addEventListener('orientationchange', function() {
try {
//landscape mode
// console.log("Orientation Changed");
if (window.orientation === 90 || window.orientation == -90) {
$scope.$apply(function() {
$scope.portraitMode = false;
});
}
//portrait
else {
$scope.$apply(function() {
$scope.portraitMode = true;
});
}
} catch (exception) {
console.log(exception);
}
});
}
])
.controller('LoginController', ["$scope", "$location", "$ionicHistory", '$timeout', '$ionicLoading', '$state',
function($scope, $location, $ionicHistory, $timeout, $ionicLoading, $state) {
$scope.username = "Guest";
$scope.password = "Abcd123";
// $ionicNavBarDelegate.showBar(false);
$scope.login = function(password) {
console.log("LoginController - login");
if (password) {
$ionicLoading.show({
content: 'Loading',
animation: 'fade-in',
showBackdrop: true,
template: '<p class="item-icon-left bar-header"><ion-spinner icon="lines"/></p>',
maxWidth: 200,
showDelay: 0
});
window.localStorage.setItem("Pswd", password);
$ionicHistory.nextViewOptions({
disableAnimate: true,
disableBack: true
});
$timeout(function() {
$ionicLoading.hide();
//$location.path("/tab/topmenu");
$state.go('contr.topmenu');
}, 1000);
}
}
}
])
.controller('AccountCtrl', function($scope) {
$scope.settings = {
enableFriends: true
};
});
Please let me know if you need any other info.Also, currently I do support local cache to cache categories locally, but not pre-cached. Is there a way to retrieve these documents beforehand? Please check my loaddocuments section which deals with loading document url's once you click on the specific item.
回答1:
Please refer this I've already explained everything with programming approach.
StackOverflow Solution Link
You can use this explained approach, and adding for others who are looking for answer to this question.
来源：https://stackoverflow.com/questions/44638667/how-do-i-pre-cache-url-content-in-ionic-1-angular-1