Develop Reference

Access RESX file from external javascript file [duplicate]

How would one get resx resource strings into javascript code stored in a .js file?
If your javascript is in a script block in the markup, you can use this syntax:
<%$Resources:Resource, FieldName %>
and it will parse the resource value in as it renders the page... Unfortunately, that will only be parsed if the javascript appears in the body of the page. In an external .js file referenced in a <script> tag, those server tags obviously never get parsed.
I don't want to have to write a ScriptService to return those resources or anything like that, since they don't change after the page is rendered so it's a waste to have something that active.
One possibility could be to write an ashx handler and point the <script> tags to that, but I'm still not sure how I would read in the .js files and parse any server tags like that before streaming the text to the client. Is there a line of code I can run that will do that task similarly to the ASP.NET parser?
Or does anyone have any other suggestions?

Here is my solution for now. I am sure I will need to make it more versatile in the future... but so far this is good.
using System.Collections;
using System.Linq;
using System.Resources;
using System.Web.Mvc;
using System.Web.Script.Serialization;
public class ResourcesController : Controller
{
private static readonly JavaScriptSerializer Serializer = new JavaScriptSerializer();
public ActionResult GetResourcesJavaScript(string resxFileName)
{
var resourceDictionary = new ResXResourceReader(Server.MapPath("~/App_GlobalResources/" + resxFileName + ".resx"))
.Cast<DictionaryEntry>()
.ToDictionary(entry => entry.Key.ToString(), entry => entry.Value.ToString());
var json = Serializer.Serialize(resourceDictionary);
var javaScript = string.Format("window.Resources = window.Resources || {{}}; window.Resources.{0} = {1};", resxFileName, json);
return JavaScript(javaScript);
}
}
// In the RegisterRoutes method in Global.asax:
routes.MapRoute("Resources", "resources/{resxFileName}.js", new { controller = "Resources", action = "GetResourcesJavaScript" });
So I can do
<script src="/resources/Foo.js"></script>
and then my scripts can reference e.g. window.Resources.Foo.Bar and get a string.

There's no native support for this.
I built a JavaScriptResourceHandler a while ago that can serve Serverside resources into the client page via objects where each property on the object represents a localization resource id and its value. You can check this out and download it from this blog post:
http://www.west-wind.com/Weblog/posts/698097.aspx
I've been using this extensively in a number of apps and it works well. The main win on this is that you can localize your resources in one place (Resx or in my case a custom ResourceProvider using a database) rather than having to have multiple localization schemes.

whereas "Common" is the name of the resource file and Msg1 is the fieldname. This also works for culture changes.
Partial Javascript...:
messages:
{
<%=txtRequiredField.UniqueID %>:{
required: "<%=Resources.Common.Msg1 %>",
maxlength: "Only 50 character allowed in required field."
}
}

In a nutshell, make ASP.NET serve javascript rather than HTML for a specific page. Cleanest if done as a custom IHttpHandler, but in a pinch a page will do, just remember to:
1) Clear out all the ASP.NET stuff and make it look like a JS file.
2) Set the content-type to "text/javascript" in the codebehind.
Once you have a script like this setup, you can then create a client-side copy of your resources that other client-side scripts can reference from your app.

If you have your resources in a separate assembly you can use the ResourceSet instead of the filename. Building on #Domenics great answer:
public class ResourcesController : Controller
{
private static readonly JavaScriptSerializer Serializer = new JavaScriptSerializer();
public ActionResult GetResourcesJavaScript()
{
// This avoids the file path dependency.
ResourceSet resourceSet = MyResource.ResourceManager.GetResourceSet(CultureInfo.CurrentUICulture, true, true);
// Create dictionary.
var resourceDictionary = resourceSet
.Cast<DictionaryEntry>()
.ToDictionary(entry => entry.Key.ToString(), entry => entry.Value.ToString());
var json = Serializer.Serialize(resourceDictionary);
var javaScript = string.Format("window.Resources = window.Resources || {{}}; window.Resources.resources = {1};", json);
return JavaScript(javaScript);
}
}
The downside is that this will not enable more than one resource-file per action. In that way #Domenics answer is more generic and reusable.
You may also consider using OutputCache, since the resource won't change a lot between requests.
[OutputCache(Duration = 3600, Location = OutputCacheLocation.ServerAndClient)]
public ActionResult GetResourcesJavaScript()
{
// Logic here...
}
http://www.asp.net/mvc/overview/older-versions-1/controllers-and-routing/improving-performance-with-output-caching-cs

I usually pass the resource string as a parameter to whatever javascript function I'm calling, that way I can continue to use the expression syntax in the HTML.

I the brown field application I'm working on we have an xslt that transforms the resx file into a javascript file as part of the build process. This works well since this is a web application. I'm not sure if the original question is a web application.

use a hidden field to hold the resource string value and then access the field value in javascript
for example :
" />
var todayString= $("input[name=TodayString][type=hidden]").val();

Add the function in the BasePage class:
protected string GetLanguageText(string _key)
{
System.Resources.ResourceManager _resourceTemp = new System.Resources.ResourceManager("Resources.Language", System.Reflection.Assembly.Load("App_GlobalResources"));
return _resourceTemp.GetString(_key);
}
Javascript:
var _resurceValue = "<%=GetLanguageText("UserName")%>";
or direct use:
var _resurceValue = "<%= Resources.Language.UserName %>";
Note:
The Language is my resouce name. Exam: Language.resx and Language.en-US.resx

Passing Array to Script in EJS file [duplicate]

I'm working on a Node.js app (it's a game). In this case, I have some code set up such that when a person visits the index and chooses a room, he gets redirected to the proper room.
Right now, it's being done like this with Express v2.5.8:
server.get("/room/:name/:roomId, function (req, res) {
game = ~databaseLookup~
res.render("board", { gameState : game.gameState });
}
Over in board.ejs I can access the gameState manner with code like this:
<% if (gameState) { %>
<h2>I have a game state!</h2>
<% } %>
Is there a way for me to import this into my JavaScript logic? I want to be able to do something like var gs = ~import ejs gameState~ and then be able to do whatever I want with it--access its variables, print it out to console for verification. Eventually, what I want to do with this gameState is to display the board properly, and to do that I'll need to do things like access the positions of the pieces and then display them properly on the screen.
Thanks!

You could directly inject the gameState variable into javascript on the page.
<% if (gameState) { %>
<h2>I have a game state!</h2>
<script>
var clientGameState = <%= gameState %>
</script>
<% } %>
Another option might be to make an AJAX call back to the server once the page has already loaded, return the gameState JSON, and set clientGameState to the JSON response.
You may also be interested in this: How can I share code between Node.js and the browser?

I had the same problem. I needed to use the data not for just rendering the page, but in my js script. Because the page is just string when rendered, you have to turn the data in a string, then parse it again in js. In my case my data was a JSON array, so:
<script>
var test = '<%- JSON.stringify(sampleJsonData) %>'; // test is now a valid js object
</script>
Single quotes are there to not be mixed with double-quotes of stringify. Also from ejs docs:
"<%- Outputs the unescaped value into the template"
The same can be done for arrays. Just concat the array then split again.

I feel that the below logic is better and it worked for me.
Assume the variable passed to the ejs page is uid, you can have the contents of the div tag or a h tag with the variable passed. You can access the contents of the div or h tag in the script and assign it to a variable.
code sample below : (in ejs)
<script type="text/javascript">
$(document).ready(function() {
var x = $("#uid").html();
alert(x); // now JS variable 'x' has the uid that's passed from the node backend.
});
</script>
<h2 style="display:none;" id="uid"><%=uid %></h2>

In the EJS template:
ex:- testing.ejs
<html>
<!-- content -->
<script>
// stringify the data passed from router to ejs (within the EJS template only)
var parsed_data = <%- JSON.stringify(data) %>
</script>
</html>
In the Server side script:
ex: Router.js
res.render('/testing', {
data: data // any data to be passed to ejs template
});
In the linked js (or jquery) script file:
ex:- script.js
In JavaScript:
console.log(parsed_data)
In JQuery:
$(document).ready(function(){
console.log(parsed_data)
});
Note:
1. user - instead of = in <% %> tag
2. you can't declare or use data passed from router to view directly into the linked javascript or jquery script file directly.
3. declare the <% %> in the EJS template only and use it any linked script file.
I'm not sure but I've found it to be the best practice to use passed data from router to view in a script file or script tag.

This works for me.
// bar chart data
var label = '<%- JSON.stringify(bowlers) %>';
var dataset = '<%- JSON.stringify(data) %>';
var barData = {
labels: JSON.parse(label),
datasets: JSON.parse(dataset)
}

You can assign backend js to front end ejs by making the backend js as a string.
<script>
var testVar = '<%= backEnd_Var%>';
</script>

This should work
res.render("board", { gameState : game.gameState });
in frontend js
const gameState = '<%- JSON.stringify(gameState) %>'

Well, in this case you can simply use input text to get data. It is easy and tested when you use it in firebase.
<input type="text" id="getID" style="display: none" value="<%=id%>">

I know this was answered a long time ago but thought I would add to it since I ran into a similar issue that required a different solution.
Essentially I was trying to access an EJS variable that was an array of JSON objects through javascript logic like so:
<script>
// obj is the ejs variable that contains JSON objects from the backend
var data = '<%= obj %>';
</script>
When I would then try and use forEach() on data I would get errors, which was because '<%= obj %>' provides a string, not an object.
To solve this:
<script>
var data = <%- obj %>;
</script>
After removing the string wrapping and changing to <%- (so as to not escape html going to the buffer) I could access the object and loop through it using forEach()

Suppose you are sending user data from the node server.
app.get("/home",isLoggedIn,(req,res)=>{
res.locals.pageTitle="Home"
res.locals.user=req.user
res.render("home.ejs");
})
And now you can use the 'user' variable in the ejs template. But to use the same value using client-side javascipt. You will have to pass the data to a variable in the tag.
Passing ejs variable to client-side variable:
<script>
let user= '<%- JSON.stringify(user) %>';
</script>
<script>home.js</script>
Now you can access the user variable at home.js

Set variable JSTL within JavaScript [duplicate]

How to set the JSTL variable value in java script?
<script>
function function1()
{
var val1 = document.getElementById('userName').value;
<c:set var="user" value=""/> // how do i set val1 here?
}
</script>
How do I set the 'user' variable (JSTL) value from 'val1' (Java script)?

It is not possible because they are executed in different environments (JSP at server side, JavaScript at client side). So they are not executed in the sequence you see in your code.
var val1 = document.getElementById('userName').value;
<c:set var="user" value=""/> // how do i set val1 here?
Here JSTL code is executed at server side and the server sees the JavaScript/Html codes as simple texts. The generated contents from JSTL code (if any) will be rendered in the resulting HTML along with your other JavaScript/HTML codes. Now the browser renders HTML along with executing the Javascript codes. Now remember there is no JSTL code available for the browser.
Now for example,
<script type="text/javascript">
<c:set var="message" value="Hello"/>
var message = '<c:out value="${message}"/>';
</script>
Now for the browser, this content is rendered,
<script type="text/javascript">
var message = 'Hello';
</script>
Hope this helps.

one more approach to use.
first, define the following somewhere on the page:
<div id="valueHolderId">${someValue}</div>
then in JS, just do something similar to
var someValue = $('#valueHolderId').html();
it works great for the cases when all scripts are inside .js files and obviously there is no jstl available

<script ...
function(){
var someJsVar = "<c:out value='${someJstLVarFromBackend}'/>";
}
</script>
This works even if you dont have a hidden/non-hidden input field set somewhere in the jsp.

Just don't. Don't write code with code. Write a JSON object or a var somewhere but for the love of a sensible HTTP divide, don't write JavaScript functions or methods hardcoded with vars/properties provided by JSTL. Generating JSON is cool. It ends there or your UI dev hates you.
Imagine if you had to dig into JavaScript to find something that was setting parameters in the middle of a class that originated on the client-side. It's awful. Pass data back and forth. Handle the data. But don't try to generate actual code.

You have to use the normal string concatenation but you have to make sure the value is a Valid XML string, you will find a good practice to write XML in this source http://oreilly.com/pub/h/2127, or if you like you can use an API in javascript to write XML as helma for example.

This variable can be set using value="${val1}" inside c:set if you have used jquery in your system.

As an answer I say No. You can only get values from jstl to javascript. But u can display the user name using javascript itself.
Best ways are here.
To display user name,
if u have html like
<div id="uName"></div>
You can display user name as follows.
var val1 = document.getElementById('userName').value;
document.getElementById('uName').innerHTML = val1;
To get data from jstl to your javascript :
var userName = '<c:out value="${user}"/>';
here ${user} is the data you get as response(from backend).
Asigning number/array length
var arrayLength = <c:out value="${details.size()}"/>;
Advanced
function advanced(){
var values = new Array();
<c:if test="${empty details.users}">
values.push("No user found");
</c:if>
<c:if test="${!empty details.users}">
<c:forEach var="user" items="${details.users}" varStatus="stat">
values.push("${user.name}");
</c:forEach>
</:c:if>
alert("values[0] "+values[0]);
});

You can save the whole jstl object as a Javascript object by converting the whole object to json. It is possible by Jackson in java.
import com.fasterxml.jackson.databind.ObjectMapper;
public class JsonUtil{
public static String toJsonString(Object obj){
ObjectMapper objectMapper = ...; // jackson object mapper
return objectMapper.writeValueAsString(obj);
}
}
/WEB-INF/tags/util-functions.tld:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
version="2.1">
<tlib-version>1.0</tlib-version>
<uri>http://www.your.url/util-functions</uri>
<function>
<name>toJsonString</name>
<function-class>your.package.JsonUtil</function-class>
<function-signature>java.lang.String toJsonString(java.lang.Object)</function-signature>
</function>
</taglib>
web.xml
<jsp-config>
<tablib>
<taglib-uri>http://www.your.url/util-functions</taglib-uri>
<taglib-location>/WEB-INF/tags/util-functions.tld</taglib-location>
</taglib>
</jsp-confi>
mypage.jsp:
<%# taglib prefix="uf" uri="http://www.your.url/util-functions" %>
<script>
var myJavaScriptObject = JSON.parse('${uf:toJsonString(myJstlObject)}');
</script>

how to write #Html.Raw in js file

Is it possible to write the below line in js file
var lst = #Html.Raw(Json.Encode(ViewBag.List));

You cannot use server side code in static js files. You could declare this global variable in the view and then use from separate javascript files.

You can made you js file dynamic, such as any other asp.net file by renaming it in
filename.aspx for example. Then your modded 'js' file will be something like:
<%# Page Title="" Language="C#" %>
<%
Response.ContentType = "application/x-javascript";
%>
function foo() {
var a = "<%= myVar %>";
}
you can include in your page with the standard way:
<script type="text/javascript" src="filename.aspx"></script>

Html Helpers can be used only in Views and not in the JavaScript files.
To make things work, you need to write your input variables to View and rest of the code in JavaScript files. So, your code should be like :
View:
<script>
var lst = #Html.Raw(Json.Encode(ViewBag.List));
</script>
and rest of the code to access "lst" will reside in javaScript file:
JS File:
$(document).ready(function(){
// access lst here, rest of the code goes here
});
Note: Do not forget to include JS file to View.

my fav solution is to give arguments as parameters:
function foo(parameter) {
var lst = parameter;
...
}
and in the View:
<input type='button' onclick="foo('#Html.Raw(Json.Encode(ViewBag.List))');" />
You may as well use an object to store every server side property and the pass it to your js as a global. Do it in the $(document).ready();. There's already a good question on SO, with more insights ont this. Will edit later with the link.
Regards,
EDIT: give a read to this SO question you'll find some more insights.

How to set the JSTL variable value in javascript?

How to set the JSTL variable value in java script?
<script>
function function1()
{
var val1 = document.getElementById('userName').value;
<c:set var="user" value=""/> // how do i set val1 here?
}
</script>
How do I set the 'user' variable (JSTL) value from 'val1' (Java script)?

It is not possible because they are executed in different environments (JSP at server side, JavaScript at client side). So they are not executed in the sequence you see in your code.
var val1 = document.getElementById('userName').value;
<c:set var="user" value=""/> // how do i set val1 here?
Here JSTL code is executed at server side and the server sees the JavaScript/Html codes as simple texts. The generated contents from JSTL code (if any) will be rendered in the resulting HTML along with your other JavaScript/HTML codes. Now the browser renders HTML along with executing the Javascript codes. Now remember there is no JSTL code available for the browser.
Now for example,
<script type="text/javascript">
<c:set var="message" value="Hello"/>
var message = '<c:out value="${message}"/>';
</script>
Now for the browser, this content is rendered,
<script type="text/javascript">
var message = 'Hello';
</script>
Hope this helps.

one more approach to use.
first, define the following somewhere on the page:
<div id="valueHolderId">${someValue}</div>
then in JS, just do something similar to
var someValue = $('#valueHolderId').html();
it works great for the cases when all scripts are inside .js files and obviously there is no jstl available

<script ...
function(){
var someJsVar = "<c:out value='${someJstLVarFromBackend}'/>";
}
</script>
This works even if you dont have a hidden/non-hidden input field set somewhere in the jsp.

Just don't. Don't write code with code. Write a JSON object or a var somewhere but for the love of a sensible HTTP divide, don't write JavaScript functions or methods hardcoded with vars/properties provided by JSTL. Generating JSON is cool. It ends there or your UI dev hates you.
Imagine if you had to dig into JavaScript to find something that was setting parameters in the middle of a class that originated on the client-side. It's awful. Pass data back and forth. Handle the data. But don't try to generate actual code.

You have to use the normal string concatenation but you have to make sure the value is a Valid XML string, you will find a good practice to write XML in this source http://oreilly.com/pub/h/2127, or if you like you can use an API in javascript to write XML as helma for example.

This variable can be set using value="${val1}" inside c:set if you have used jquery in your system.

As an answer I say No. You can only get values from jstl to javascript. But u can display the user name using javascript itself.
Best ways are here.
To display user name,
if u have html like
<div id="uName"></div>
You can display user name as follows.
var val1 = document.getElementById('userName').value;
document.getElementById('uName').innerHTML = val1;
To get data from jstl to your javascript :
var userName = '<c:out value="${user}"/>';
here ${user} is the data you get as response(from backend).
Asigning number/array length
var arrayLength = <c:out value="${details.size()}"/>;
Advanced
function advanced(){
var values = new Array();
<c:if test="${empty details.users}">
values.push("No user found");
</c:if>
<c:if test="${!empty details.users}">
<c:forEach var="user" items="${details.users}" varStatus="stat">
values.push("${user.name}");
</c:forEach>
</:c:if>
alert("values[0] "+values[0]);
});

You can save the whole jstl object as a Javascript object by converting the whole object to json. It is possible by Jackson in java.
import com.fasterxml.jackson.databind.ObjectMapper;
public class JsonUtil{
public static String toJsonString(Object obj){
ObjectMapper objectMapper = ...; // jackson object mapper
return objectMapper.writeValueAsString(obj);
}
}
/WEB-INF/tags/util-functions.tld:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
version="2.1">
<tlib-version>1.0</tlib-version>
<uri>http://www.your.url/util-functions</uri>
<function>
<name>toJsonString</name>
<function-class>your.package.JsonUtil</function-class>
<function-signature>java.lang.String toJsonString(java.lang.Object)</function-signature>
</function>
</taglib>
web.xml
<jsp-config>
<tablib>
<taglib-uri>http://www.your.url/util-functions</taglib-uri>
<taglib-location>/WEB-INF/tags/util-functions.tld</taglib-location>
</taglib>
</jsp-confi>
mypage.jsp:
<%# taglib prefix="uf" uri="http://www.your.url/util-functions" %>
<script>
var myJavaScriptObject = JSON.parse('${uf:toJsonString(myJstlObject)}');
</script>