Accessing MVC s model property from Javascript

Question

I have the following model which is wrapped in my view model  public class FloorPlanSettingsModel       public int Id   get  set        public int  MainFloorPlanId   get  set        public string ImageDirectory   get  set        public string ThumbnailDirectory   get  set        public string IconsDirectory   get  set        How do I access one of the above properties from Javascript   I tried this  but I got  undefined   var floorplanSettings     Model FloorPlanSettings   alert floorplanSettings IconsDirectory

User · Answer

I know its too late but this solution is working perfect for both  net framework and  net core    System Web HttpUtility JavaScriptStringEncode

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Wrapping the model property around parens worked for me   You still get the same issue with Visual Studio complaining about the semi-colon  but it works   var closedStatusId     Model ClosedStatusId

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try this   you missed the single quotes   var floorplanSettings     Html Raw Json Encode Model FloorPlanSettings

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If  ReferenceError  Model is not defined  error is raised  then you might try to use the following method     document  ready function               var serializer   new System Web Script Serialization JavaScriptSerializer             var json   serializer Serialize Model              var model    Html Raw json       if model    null  amp  amp   Html Raw json      undefined                 var id  model Id          var mainFloorPlanId   model MainFloorPlanId           var imageDirectory   model ImageDirectory           var iconsDirectory   model IconsDirectory               Hope this helps

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Contents of the Answer      1  How to access Model data in Javascript Jquery code block in  cshtml file      2  How to access Model data in Javascript Jquery code block in  js file   How to access Model data in Javascript Jquery code block in  cshtml file  There are two types of c  variable  Model  assignments  to JavaScript variable    Property assignment - Basic datatypes like int  string  DateTime  ex  Model Name  Object assignment - Custom or inbuilt classes   ex  Model  Model UserSettingsObj    Lets look into the details of these two assignments   For the rest of the answer lets consider the below AppUser Model as an example   public class AppUser       public string Name   get  set        public bool IsAuthenticated   get  set        public DateTime LoginDateTime   get  set        public int Age   get  set        public string UserIconHTML   get  set        And the values we assign this Model are  AppUser appUser   new AppUser       Name    Raj       IsAuthenticated   true      LoginDateTime   DateTime Now      Age   26      UserIconHTML     lt i class  fa fa-users  gt  lt  i gt        Property assignment  Lets use different syntax for assignment and observe the results   1  Without wrapping property assignment in quotes   var Name    Model Name    var Age    Model Age  var LoginTime    Model LoginDateTime   var IsAuthenticated    Model IsAuthenticated     var IconHtml    Model UserIconHTML        As you can see there are couple of errors  Raj and True is considered to be javascript variables and since they dont exist its an variable undefined error  Where as for the dateTime varialble the error is unexpected number numbers cannot have special characters  The HTML tags are converted into its entity names so that the browser doesn t mix up your values and the HTML markup   2  Wrapping property assignment in Quotes   var Name     Model Name   var Age     Model Age   var LoginTime     Model LoginDateTime   var IsAuthenticated     Model IsAuthenticated   var IconHtml     Model UserIconHTML        The results are valid  So wrapping the property assignment in quotes gives us valid syntax  But note that the Number Age is now a string  So if you dont want that we can just remove the quotes and it will be rendered as a number type   3  Using  Html Raw but without wrapping it in quotes   var Name    Html Raw Model Name    var Age    Html Raw Model Age    var LoginTime    Html Raw Model LoginDateTime    var IsAuthenticated    Html Raw Model IsAuthenticated    var IconHtml    Html Raw Model UserIconHTML       The results are similar to our test case 1  However using  Html Raw  on the HTML string did show us some change  The HTML is retained without changing to its entity names   From the docs Html Raw       Wraps HTML markup in an HtmlString instance so that it is interpreted as HTML markup    But still we have errors in other lines   4  Using  Html Raw and also wrapping it within quotes  var Name    Html Raw Model Name    var Age     Html Raw Model Age    var LoginTime     Html Raw Model LoginDateTime    var IsAuthenticated     Html Raw Model IsAuthenticated    var IconHtml     Html Raw Model UserIconHTML        The results are good with all types  But our HTML data is now broken and this will break the scripts  The issue is because we are using single quotes   to wrap the the data and even the data has single quotes    We can overcome this issue with 2 approaches    1  use double quotes     to wrap the HTML part  As the inner data has only single quotes   Be sure that after wrapping with double quotes there are no   within the data too     var IconHtml     Html Raw Model UserIconHTML      2  Escape the character meaning in your server side code  Like    UserIconHTML     lt i class   fa fa-users   gt  lt  i gt     Conclusion of property assignment   Use quotes for non numeric dataType  Do Not use quotes for numeric dataType  Use Html Raw to interpret your HTML data as is  Take care of your HTML data to either escape the quotes meaning in server side  Or use a different quote than in data during assignment to javascript variable      Object assignment  Lets use different syntax for assignment and observe the results   1  Without wrapping object assignment in quotes     var userObj    Model       When you assign a c  object to javascript variable the value of the  ToString   of that oject will be assigned  Hence the above result    2 Wrapping object assignment in quotes  var userObj     Model        3  Using Html Raw without quotes      var userObj    Html Raw Model        4  Using Html Raw along with quotes     var userObj     Html Raw Model         The Html Raw was of no much use for us while assigning a object to variable    5  Using Json Encode   without quotes  var userObj    Json Encode Model       result is like var userObj     amp quot Name amp quot   amp quot Raj amp quot                   amp quot IsAuthenticated amp quot  true                  amp quot LoginDateTime amp quot   amp quot   Date 1482572875150    amp quot                   amp quot Age amp quot  26                  amp quot UserIconHTML amp quot   amp quot  u003ci class   amp quot fa fa-users  amp quot  u003e u003c i u003e amp quot                     We do see some change  We see our Model is being interpreted as a object  But we have those special characters changed into entity names  Also wrapping the above syntax in quotes is of no much use  We simply get the same result within quotes   From the docs of Json Encode       Converts a data object to a string that is in the JavaScript Object Notation  JSON  format    As you have already encountered this entity Name issue with property assignment and if you remember we overcame it with the use of Html Raw  So lets try that out  Lets combine Html Raw and Json Encode  6  Using Html Raw and Json Encode without quotes   var userObj    Html Raw Json Encode Model      Result is a valid Javascript Object   var userObj     Name   Raj         IsAuthenticated  true        LoginDateTime     Date 1482573224421            Age  26        UserIconHTML    u003ci class   fa fa-users   u003e u003c i u003e          7  Using Html Raw and Json Encode within quotes   var userObj     Html Raw Json Encode Model         As you see wrapping with quotes gives us a JSON data  Conslusion on Object assignment   Use Html Raw and Json Encode in combintaion to assign your object to javascript variable as JavaScript object  Use Html Raw and Json Encode also wrap it within quotes to get a JSON   Note  If you have observed the DataTime data format is not right  This is because as said earlier Converts a data object to a string that is in the JavaScript Object Notation  JSON  format and JSON does not contain a date type  Other options to fix this is to add another line of code to handle this type alone using javascipt Date   object  var userObj LoginDateTime   new Date   Html Raw Model LoginDateTime        without Json Encode       How to access Model data in Javascript Jquery code block in  js file  Razor syntax has no meaning in  js file and hence we cannot directly use our Model insisde a  js file  However there is a workaround   1  Solution is using javascript Global variables   We have to assign the value to a global scoped javascipt variable and then use this variable within all code block of your  cshtml and  js files  So the syntax would be    lt script type  text javascript  gt    var userObj    Html Raw Json Encode Model      For javascript object   var userJsonObj     Html Raw Json Encode Model       For json data  lt  script gt    With this in place we can use the variables userObj and userJsonObj as and when needed   Note  I personally dont suggest using global variables as it gets very hard for maintainance  However if you have no other option then you can use it with having a proper naming convention    something like userAppDetails global   2  Using function   or closure Wrap all the code that is dependent on the model data in a function  And then execute this function from the  cshtml file    external js   function userDataDependent userObj            related code       cshtml file    lt script type  text javascript  gt    userDataDependent  Html Raw Json Encode Model       execute the function       lt  script gt    Note  Your external file must be referenced prior to the above script  Else the userDataDependent function is undefined    Also note that the function must be in global scope too  So either solution we have to deal with global scoped players

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You could take your entire server-side model and turn it into a Javascript object by doing the following   var model    Html Raw Json Encode Model      In your case if you just want the FloorPlanSettings object  simply pass the Encode method that property   var floorplanSettings    Html Raw Json Encode Model FloorPlanSettings

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