https://stackoverflow.com/questions/21075008
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RussianWell after you post source, then other idea what it could is that some scripts are conflicting, try to remove scripts and left only knockout ones
Creating a KnockoutJS Model From an ASP.NET MVC complex model
-
27-09-2022 - |
Domanda
I would like to create knockout viewModel from asp.net MVC model using ko.mapping.fromJS() method but my form didn't populating values.
In view I created script looks like that:
<script type="text/javascript">
var tmp = @Html.Raw(Model.ToJson());
var viewModel = ko.mapping.fromJS(tmp);
ko.applyBindings(viewModel);
</script>
@Html.Raw(Model.ToJson() returns value
{"id":1,
"surveyCode":null,
"title":"Życie",
"description":"Ankieta, w której zadawane będą pytania na temat codziennego życia ",
"dateStart":"2013-12-12T00:00:00",
"dateEnd":"2014-12-30T00:00:00",
"createDate":"2014-01-07T03:23:16.053",
"lastModification":"2014-01-07T03:23:16.053",
"isActive":false,
"questions":[{"id":1,
"surveyID":1,
"content":"Co jesz na śniadanie?",
"tips":"wybierz jedną odpowiedź",
"questionType":1,
"isRequired":true,
"answers": [{"id":1,
"questionID":1,
"answerContent":"Jajecznicę",
"isOpenAnswer":false},
{"id":2,
"questionID":1,
"answerContent":"Kiełbaski",
"isOpenAnswer":false},
{"id":3,
"questionID":1,
"answerContent":"Płatki na mleku",
"isOpenAnswer":false},
{"id":4,
"questionID":1,
"answerContent":"Inne",
"isOpenAnswer":true}]},
{"id":2,
"surveyID":1,
"content":"Czym się zajmujesz w życiu?",
"tips":"napisz krótką historię",
"questionType":3,
"isRequired":true,
"answers":[]}]}
but when I want to bind 'title' property to <span> <span data-bind="text:title"></span> it is not working. When I run my app in firefox and turn on firebug script console and set breakpiont to line var tmp = @Html.Raw(Model.ToJson()); returns correct value, press F10 going to next line var viewModel = ko.mapping.fromJS(tmp); and finally press F10 and nothing happen, script not execute next line ko.applyBindings(viewModel);.
And it is my question. Is it possible to mapp my mvc model using knockout mapping plugin automacly? or maybe should I do some manualy staf to map mvc model to knockout viewModel.
I'm looking for answers on this sites: link1 and stackowerflow but maybe I didn't understand this posts.
Edit
my view looks like this:
@using Inżynierka.Extensions
@model Inżynierka.Models.Survey
@{
ViewBag.Title = "Create";
}
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>SurveyAnswer</h4>
<hr />
@Html.ValidationSummary(true)
Title: <span data-bind="text:title"></span>
</div>
}
@section Scripts {
<script src="../../Scripts/jQuery.tmpl.min.js" type="text/javascript"></script>
<script src="../../Scripts/knockout-3.0.0.js" type="text/javascript"></script>
<script src="../../Scripts/knockout.validation.js"></script>
<script src="../../Scripts/knockout.knockout.mapping-latest.js"></script>
<script type="text/javascript">
var tmp = @Html.Raw(Model.ToJson());
var viewModel = ko.mapping.fromJS(tmp);
ko.applyBindings(viewModel);
</script>
@Scripts.Render("~/bundles/jqueryval")
}
Edit 2
It is html sourse of my page:
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript' src='http://ajax.aspnetcdn.com/ajax/knockout/knockout-3.0.0.js'></script>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Create</title>
<link href="/Content/bootstrap.css" rel="stylesheet"/>
<link href="/Content/site.css" rel="stylesheet"/>
<script src="/Scripts/modernizr-2.6.2.js"></script>
</head>
<body>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">Ankietyy</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="/Surveys">Moje Ankiety</a></li>
<li><a href="/">Strona Główna</a></li>
<li><a href="/Home/About">O Projekcie</a></li>
<li><a href="/Home/Contact">Kontakt</a></li>
</ul>
<form action="/Account/LogOff" class="navbar-right" id="logoutForm" method="post"><input name="__RequestVerificationToken" type="hidden" value="fWDZFmyGqJyU3ATUf2IbHDdkbo22bzObUMwUfxfqwXIiqGvRYzMhApWS3I5GkkHnZD7ieDxLfh84s2-prLDtSGeE6_D7p7cT-fmQBszeM06p-fZ7RzhOPn0P8EDftLRwT8YQA8t2U56dlLX_lx3G4Q2" /> <ul class="nav navbar-nav navbar-right">
<li>
<a href="/Account/Manage" title="Manage">Witaj Bartek!</a>
</li>
<li><a href="javascript:document.getElementById('logoutForm').submit()">Wyloguj się</a></li>
</ul>
</form>
</div>
</div>
</div>
<div class="container body-content">
<form action="/SurveyAnswer/CompleteSurvey/1" method="post"><input name="__RequestVerificationToken" type="hidden" value="KOALGZbw0WhFlBV4LHx530Oen59aBWF62b6s58GIUikx3A62uhcAi3-74auJpLtI4fYj9kmcPjlgNu1TeuNrYukpFlll1cGCOIcjjewtFou4M9C3_bHDFk7UoZk_tKpw7SxcXa3UbgwIj4ZhCRM6_g2" /> <div class="form-horizontal">
<h4>SurveyAnswer</h4>
<hr />
Title: <span data-bind="text:title"></span>
</div>
</form><script type="text/javascript">
var tmp = {"id":1,"surveyCode":null,"title":"Życie","description":"Ankieta, w której zadawane będą pytania na temat codziennego życia ","dateStart":"2013-12-12T00:00:00","dateEnd":"2014-12-30T00:00:00","createDate":"2014-01-07T03:23:16.053","lastModification":"2014-01-07T03:23:16.053","isActive":false,"questions":[{"id":1,"surveyID":1,"content":"Co jesz na śniadanie?","tips":"wybierz jedną odpowiedź","questionType":1,"isRequired":true,"answers":[{"id":1,"questionID":1,"answerContent":"Jajecznicę","isOpenAnswer":false},{"id":2,"questionID":1,"answerContent":"Kiełbaski","isOpenAnswer":false},{"id":3,"questionID":1,"answerContent":"Płatki na mleku","isOpenAnswer":false},{"id":4,"questionID":1,"answerContent":"Inne","isOpenAnswer":true}]},{"id":2,"surveyID":1,"content":"Czym się zajmujesz w życiu?","tips":"napisz krótką historię","questionType":3,"isRequired":true,"answers":[]},{"id":14,"surveyID":1,"content":"Pytanie końcowe","tips":"napisz","questionType":1,"isRequired":true,"answers":[{"id":9,"questionID":14,"answerContent":"test","isOpenAnswer":false},{"id":10,"questionID":14,"answerContent":"test2","isOpenAnswer":false},{"id":11,"questionID":14,"answerContent":"test3","isOpenAnswer":false}]}],"surveyAnswers":[],"codeForUsers":[]};
var viewModel = ko.mapping.fromJS(tmp);
ko.applyBindings(viewModel);
</script>
<hr />
<footer>
<p>© 2014 - My ASP.NET Application</p>
</footer>
</div>
<script src="/Scripts/jquery-2.0.3.js"></script>
<script src="/Scripts/bootstrap.js"></script>
<script src="/Scripts/respond.js"></script>
<script src="../../Scripts/jQuery.tmpl.min.js" type="text/javascript"></script>
<script src="../../Scripts/knockout-3.0.0.js" type="text/javascript"></script>
<script src="../../Scripts/knockout.validation.js"></script>
<script src="../../Scripts/knockout.mapping-latest.js"></script>
<script src="/Scripts/jquery.validate.js"></script>
<script src="/Scripts/jquery.validate.unobtrusive.js"></script>
<!-- Visual Studio Browser Link -->
<script type="application/json" id="__browserLink_initializationData">
{"appName":"Firefox","requestId":"9f8e517696004299808eb3caccb0e136"}
</script>
<script type="text/javascript" src="http://localhost:11897/dc47e85290da49019e6425ddd16f962a/browserLink" async="async"></script>
<!-- End Browser Link -->
</body>
</html>
Answer for my issue
View should looks like that:
@using Inżynierka.Extensions
@model Inżynierka.Models.Survey
@{
ViewBag.Title = "Create";
}
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>SurveyAnswer</h4>
<hr />
@Html.ValidationSummary(true)
Title: <span data-bind="text:title"></span>
</div>
}
@section Scripts {
<script src="../../Scripts/knockout-3.0.0.js" type="text/javascript"></script>
<script src="../../Scripts/knockout.mapping-latest.js"></script>
<script type="text/javascript">
var tmp = @Html.Raw(Model.ToJson());
var viewModel = ko.mapping.fromJS(tmp);
ko.applyBindings(viewModel);
</script>
@Scripts.Render("~/bundles/jqueryval")
}
Thanks everyone for replies, specially for @VolodymyrBilyachat whose advices were most relevant.
Soluzione
Altri suggerimenti
Wrap your knockout view model in a document.ready function
<script type="text/javascript">
$document.ready(function() {
var tmp = @Html.Raw(Model.ToJson());
var viewModel = ko.mapping.fromJS(tmp);
ko.applyBindings(viewModel);});
</script>
Also note that your viewModel isn't a true view model at that point so consider using a view model that contains the ko.observable property 'myData' or something to hold your data and then applying bindings
For complex models I don't believe mappings and simply, I'm parsing json on my own and populate model via loops, ifs and so on. I think, this isn't the worst solution, because debugging and fixing data becomes simplier.
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