knockout.js - Knockout observable variable not changing its value on click -

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I do not know why my currentTitle is not changing on click 

  viewModel = {article: ko.observableArray ([{id: 1, title: "Article One", Content: "Content for an article."}, {ID: 2, Title: "Article two" Content: "Content for article two."}, {ID: 3, title: "Article three", content: "Content for article three."}})), Currenttitle: korseous ("old")} ; & Lt; Div data-bind = "foreach: viewModel.articles ()" & gt; & Lt; div data-bind = "text: title, click: getTitle" & gt; & Lt; / Div & gt; & Lt; / Div & gt; & Lt; div data-bound = "text: visualmodel.crtitle" & gt; & Lt; / Div & gt; getTitle = function () {viewModel.currentTitle = "title"; } Ko.applyBindings (viewModel);   
 My code was posted here:   
 
 
 Your  getTitle  
 Try:  
  getTitle = function () {viewModel.currentTitle ("title");  
}

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