[英]Display dialogs in a loop and act on the accept event
在我的Nativescript應用中,我有一個循環,想為每個要迭代的項目顯示一個對話框。 當對話框顯示時,它包含“接受”和“拒絕”選項,當單擊它們時,我都想調用將迭代項傳遞到其中的方法。 問題在於,由於選項選擇返回了一個承諾,我將丟失對迭代項的引用。 我該怎么辦才能解決這個問題? 這是我的代碼示例。
編輯:我也真的不喜歡在諾言返回后在循環中聲明一個函數。
function _showPendingConnections() {
for (var i = 0; i < ViewModel.pendingConnections.length; i++) {
var pendingConnection = ViewModel.pendingConnections[i];
dialog.confirm({
message: pendingConnection.PatientFirstName + " would like to share their glucose readings with you.",
okButtonText:"Accept",
cancelButtonText:"Reject"
}).then(function(result) {
if(result === true) {
ViewModel.acceptConnection(pendingConnection);
} else {
ViewModel.removeConnection(pendingConnection);
}
});
}
}
以下更改對我有用(我可能創建了不同的viewModel,但是想法是相同的)-我所做的就是更改傳遞項目索引時的更改。
例如:
// main-page.js
"use strict";
var main_view_model_1 = require("./main-view-model");
var dialogModule = require("ui/dialogs");
var viewModel = new main_view_model_1.MyViewModel();
viewModel.pendingConnections = [{ PatientFirstName: "John" }, { PatientFirstName: "Merry" }, { PatientFirstName: "Abygeil" }];
// Event handler for Page "navigatingTo" event attached in main-page.xml
function navigatingTo(args) {
// Get the event sender
var page = args.object;
page.bindingContext = viewModel;
for (var index = viewModel.pendingConnections.length - 1; index >= 0; index--) {
connectionDealer(index);
}
}
exports.navigatingTo = navigatingTo;
function connectionDealer(index) {
var pendingConnection = viewModel.pendingConnections[index];
dialogModule.confirm({
message: pendingConnection["PatientFirstName"] + " would like to share their glucose readings with you.",
okButtonText: "Accept",
cancelButtonText: "Reject"
}).then(function (result) {
if (result === true) {
// your code follow.. pass pendingConnection[index] to your method
console.log("accepted by " + pendingConnection["PatientFirstName"]);
}
else {
// your code follow.. pass pendingConnection[index] to your method
console.log("Rejected by " + pendingConnection["PatientFirstName"]);
}
});
}
// main-view-model.js
"use strict";
var observable = require("data/observable");
var MyViewModel = (function (_super) {
__extends(MyViewModel, _super);
function MyViewModel() {
_super.apply(this, arguments);
}
Object.defineProperty(MyViewModel.prototype, "pendingConnections", {
get: function () {
return this._pendingConnections;
},
set: function (value) {
if (this._pendingConnections !== value) {
this._pendingConnections = value;
}
},
enumerable: true,
configurable: true
});
return MyViewModel;
}(observable.Observable));
exports.MyViewModel = MyViewModel;
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