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POUnable to get property of undefined or null reference - Windows 8 JS/CSS app
 

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    <p>Below is a snippet of my code. The error I am getting is that when I perform a search and call the method <code>_searchData</code>, it successfully calls the method <code>_lookUpSuccess</code>, however then returns the following error:</p> <p><strong>JavaScript runtime error: Unable to get property '_displayResult' of undefined or null reference</strong></p> <p>when it tries to call the <code>_displayResult</code> method.</p> <p>Why this may be? </p> <pre><code>(function () { // make this an object property/method eventually var displayResult = function (queryResult) { for (var i = 0; i &lt; holder.length; i++) { //document.querySelector(".item-content .title").textContent = "FilmApp"; document.querySelector(holder[i]).textContent = queryResult[i]; }}; // Creates a new page control with members ui.Pages.define(searchPageURI, { //... _searchData: function (queryText) { searchBase = 'http://www.example.com/web-service2.php?termID='; searchFormat = 'JSON'; searchFormatPiece = '&amp;format=' + searchFormat; if (!window.Data) { var searchUrl = searchBase + queryText + searchFormatPiece; WinJS.xhr({ url: searchUrl }).done(this._lookUpSuccess, this._lookUpFail, this._lookUpProgress); }else{ document.querySelector(".titlearea .pagetitle").textContent = "There has been a computer malfunction - sort it the **** out!"; } }, _lookUpSuccess: function xhrSucceed(Result) { var response = JSON.parse(Result.responseText); if (response.response[0].Message === "Found") { for (var x in response.response[1].term) { content.push(response.response[1].term[x]); }; this._displayResult(content); //displayResult(content); return content; } else { content.push("Not Found", "Not Found"); return content; } }, _lookUpFail: function xhrFail(Result) { document.querySelector(".titlearea .pagetitle").textContent = "Got Error"; }, _lookUpProgress: function xhrProgress(Result) { document.querySelector(".titlearea .pagetitle").textContent = "No Result 2"; }, _displayResult: function (queryResult) { var holder; holder = [DefDiv, DescDiv]; for (var i = 0; i &lt; holder.length; i++) { //document.querySelector(".item-content .title").textContent = "FilmApp"; document.querySelector(holder[i]).textContent = queryResult[i]; }; }, }); // End of UI.page.define // #2 This method is run on application load WinJS.Application.addEventListener("activated", function (args) { if (args.detail.kind === appModel.Activation.ActivationKind.search) { args.setPromise(ui.processAll().then(function () { if (!nav.location) { nav.history.current = { location: Application.navigator.home, initialState: {} }; } return nav.navigate(searchPageURI, { queryText: args.detail.queryText }); })); } }); // #3 appModel.Search.SearchPane.getForCurrentView().onquerysubmitted = function (args) { nav.navigate(searchPageURI, args); }; })(); </code></pre>
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