更好
我有SharePoint使用的一些自定义JavaScript代码。我需要在加载后自动将一部分刷新。我尝试使用setInterval。这是我的功能:
define([
'jquery',
'knockout',
'text!./home-page-census.html',
'q',
'underscore',
'census',
'moment',
'sp_core',
'bootstrap',
'!domReady'
], function ($, ko, htmlString, Q, _, census, moment) {
var baseUrl = _spPageContextInfo.siteAbsoluteUrl;
function buildRequestUrl() {
var requestUrl = baseUrl + "/_api/web/lists/GetByTitle('Census')/items?";
var oDataSelect = "$select=Title,CensusBranch,BedAvailabilityPercentage,Modified,StatusBarColor,DisplayText,Tooltip";
return requestUrl += oDataSelect;
}
function getUpdatedCensus() {
return Q.Promise(function (resolve, reject, notify) {
requestUrl = buildRequestUrl();
census.getCensus(requestUrl).then(onFulfilled, onRejected);
//setInterval(census.getCensus(requestUrl).then(onFulfilled, onRejected), 3000);
function onFulfilled(censusResult) {
resolve(censusResult);
}
function onRejected(reason) {
reject(reason);
}
});
}
function initViewModel(viewModel) {
getUpdatedCensus().then(onFulfilled, onRejected);
function onFulfilled(result) {
viewModel.censusByBranch(result);
viewModel.isInitializing(false);
}
function onRejected(reason) {
console.log(reason.message);
console.log(reason.stack);
viewModel.isInitializing(false);
}
}
function HomePageCensusViewModel(params) {
var self = this;
self.isInitializing = ko.observable(true);
self.censusByBranch = ko.observable();
initViewModel(self);
}
ko.bindingHandlers.censusLastUpdatedTime = {
update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
var value = valueAccessor();
var lastUpdated = ko.unwrap(value);
$(element).text(lastUpdated.format('M[/]DD [@] h[:]mmA'));
}
}
return {
viewModel: HomePageCensusViewModel,
template: htmlString
};
});
setTimeout
的第一个参数需要为函数。如书面...
setInterval(census.getCensus(requestUrl).then(onFulfilled, onRejected), 3000);
... census.getCensus(...)
立即被调用,返回的承诺将传递给setTimeout
。
将其包裹在此功能中应该有效...
setInterval(function() { census.getCensus(requestUrl).then(onFulfilled, onRejected) }, 3000);
还值得一提的是,在then
中使用拒绝处理程序被认为是不良习惯。使用.then(onSuccess).catch(onRejected)
。