assign C# string of array or string[] to javascript array [duplicate]

Question

I have a js code in which an array works well when its like

var availableTags = [
            "ActionScript",
            "AppleScript",
            "Asp",
            "BASIC",
            "C"
];

I then made an array string in my code behind or .cs like on class level

 public static string[] test={"animal","lovely"};

I then changed the JS array to this

var availableTags =  "<%=test%>"; // also tried without quotes

Now I m not having the results as was having with previous js array

Editing with complete code, the jQuery I taken from http://jqueryui.com/demos/autocomplete/#multiple

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.Collections;
using System.Web.Script.Serialization;

public partial class onecol : System.Web.UI.Page
{
   JavaScriptSerializer serializer;

   public static string test = "['animal','lovely']";
    public static string check;

   
    protected void Page_Load(object sender, EventArgs e)
    {
       serializer = new JavaScriptSerializer();
        //serializer
        this.detail.ToolsFile = "BasicTools.xml";
        test = returnTitle();
    }
   
}

and the script with html is

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<script type="text/javascript" src="Jscript.js"></script>  
     <script type="text/javascript" src="jquery-1.7.1.min.js"></script> 
     <script type="text/javascript" src="jquery-ui-1.8.17.custom.css"></script>  
     <link href="~/jquery-ui-1.8.17.custom.css" rel="stylesheet" type="text/css"/>
      <script type="text/javascript">
          $(function () {
                var availableTags =  <%=test%>;
             
              function split(val) {
                  return val.split(/,\s*/);
              }
              function extractLast(term) {
                  return split(term).pop();
              }

              $("#tags")
              // don't navigate away from the field on tab when selecting an item
            .bind("keydown", function (event) {
                if (event.keyCode === $.ui.keyCode.TAB &&
                        $(this).data("autocomplete").menu.active) {
                    event.preventDefault();
                }
            })
            .autocomplete({
                minLength: 0,
                source: function (request, response) {
                    // delegate back to autocomplete, but extract the last term
                    response($.ui.autocomplete.filter(
                        availableTags, extractLast(request.term)));
                },
                focus: function () {
                    // prevent value inserted on focus
                    return false;
                },
                select: function (event, ui) {
                    var terms = split(this.value);
                    // remove the current input
                    terms.pop();
                    // add the selected item
                    terms.push(ui.item.value);
                    // add placeholder to get the comma-and-space at the end
                    terms.push("");
                    this.value = terms.join(", ");
                    return false;
                }
            });
          });
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<div class="demo" >
<div class="ui-widget">
    <label for="tags">Tag programming languages: </label>
    <input id="Text1" class="#tags" size="50" />


</div>
</div>

actually its a auto complete functionality to give tags ,the auto complete suggestions for tagging I want to get from C# code ,I took Jquery source from jqueryui.com/demos/autocomplete/#multiple and then I tried to give it C# string from .cs file , I explained it with code on edited version , with C# code behind it works exactly as its in the link

@TimSchmelter edited ,please check

user1074474
– user1074474

2012-01-26 20:08:30 +00:00
Commented Jan 26, 2012 at 20:08 — user1074474
– user1074474, Commented Jan 26, 2012 at 20:08

Brian · Accepted Answer · 2012-01-26 20:25:54Z

26

You need to serialize the C# string array into a javascript array.

http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx

Usually I create a simple static class as a wrapper.

public static class JavaScript
{
    public static string Serialize(object o)
    {            
        JavaScriptSerializer js = new JavaScriptSerializer();
        return js.Serialize(o);
    }
}

Then you can use that class to serialize the item you need to

//C# Array(Member of asp page)
protected string[] Values = { "Sweet", "Awesome", "Cool" };

<script type="text/javascript">
    var testArray = <%=JavaScript.Serialize(this.Values) %>
</script>

edited Jan 26, 2012 at 20:25

answered Jan 26, 2012 at 19:27

Brian

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Comments

James Montagne · Accepted Answer · 2012-01-26 19:27:45Z

7

var availableTags =  ['<%=String.join("','",test)%>'];

answered Jan 26, 2012 at 19:27

James Montagne

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3 Comments

James Montagne Over a year ago

It should be noted that if any of your strings contain a single quote, these should be escaped.

user1074474 Over a year ago

Compiler Error Message: CS0117: 'String' does not contain a definition for 'join'

Peter Griffin Over a year ago

@user1074474 It was giving me the same error. Were you doing an online coding challenge? I think that some commands aren't allowed in some of those, unless I'm missing something. In order to do a workaround, I just created a StringBuilder and iterated over the array, adding integer values, then parsing a string from the result.

amit_g · Accepted Answer · 2012-01-27 17:19:22Z

3

It would be something like this...

var availableTags =  ["<%= string.Join("\", \"", test) %>"];

or

var availableTags =  ['<%= string.Join("', '", test) %>'];

The first one would render as

var availableTags = ["Sweet", "Awesome", "Cool"];

and the second one would render as

var availableTags = ['Sweet', 'Awesome', 'Cool'];

both of which are fine for autocomplete.

edited Jan 27, 2012 at 17:19

answered Jan 26, 2012 at 19:26

amit_g

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12 Comments

user1074474 Over a year ago

I tried it with/without quotes/[] and with ' ' as well , but still not working

amit_g Over a year ago

@user1074474, What do you mean by "not working"? Show us the error or the rendered HTML (do view source).

amit_g Over a year ago

@user1074474, We don't have to see the full source code. All we need to see is the error if you are getting or relevant portion of rendered HTML.

user1074474 Over a year ago

actually its a auto complete functionality to give tags ,the auto complete suggestions for tagging I want to get from C# code ,I took Jquery source from jqueryui.com/demos/autocomplete/#multiple and then I tried to give it C# string from .cs file , I explained it with code on edited version , with C# code behind it works exactly as its in the link

amit_g Over a year ago

Do view source in your browser and search for var availableTags = <What Is Rendered Here?>;

|

James Montagne · Accepted Answer · 2012-01-26 19:35:39Z

1

test property should be a string property and it should render the string which will be parsed by Js engine as an array. Try this.

Code behind property

public static string test= "['animal','usman lovely']";

JS

 var availableTags =  <%=test%>;//No quotes

edited Jan 26, 2012 at 19:35

James Montagne

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answered Jan 26, 2012 at 19:26

ShankarSangoli

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4 Comments

James Montagne Over a year ago

Should probably drop the curly braces and define it as string.

ShankarSangoli Over a year ago

What do you see in the source when the page is rendered?

user1074474 Over a year ago

you are right , i got var availableTags = "['animal','usman lovely']"; in the source , so should i need to get it as "["animal","usman lovely"]" because original source has written it as it is ,hows that possible in C# ?I need my C# code to give C# code string like present here jqueryui.com/demos/autocomplete/#multiple , please let me know a method

ShankarSangoli Over a year ago

Remove the double qutoes arount text i.e. var availableTags = <%=test%>. Then you can use that variable as an array in JavaScript

Zare Ahmer · Accepted Answer · 2013-06-25 10:32:00Z

0

only use indexes to get your test string array i have tried by giving indexes like

var availableTags =  "<%=test[0]%>";  // animal 
var availableTags =  "<%=test[1]%>";  // lovely

answered Jun 25, 2013 at 10:32

Zare Ahmer

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Comments

Peter Griffin · Accepted Answer · 2022-09-29 15:45:41Z

0

If you're doing an online coding challenge, the browser-based IDE might not let you use string.join, like with my job, which has us use iMocha.

Instead of that, I just created a StringBuilder object (from System.Text) and iterated over the array, appending each integer and a blank space, then converting the result to a string. Something like this:

var array = new int[] {1, 3, 5, 7, 9};
var str = new StringBuilder();
foreach (int i in array)
{
  str.Append(i);
  str.Append(" ");
}
var result = str.ToString();

answered Sep 29, 2022 at 15:45

Peter Griffin

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