var nUserID = '<% if (ids != null) {ids.userID.ToString();}%>'
Note: ids is not null nor ids.userID is null but em getting nUserID = ""
Is there any way to convert C# string to Javascript string?
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1You should not think of this as "converting a C# string to a Javascript string". Such a thing does not make sense .. the two never interact in this scenario where the page is being rendered. Your C# is merely being interpreted and the result dumped into the HTML.Simon Whitehead– Simon Whitehead2015-02-06 10:20:25 +00:00Commented Feb 6, 2015 at 10:20
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4 Answers
For write it direct on page you need to use the Response.Write as
var nUserID = <% if (ids != null) {Response.Write(ids.userID.ToString());}%>
beside that, if you need to add at the end ; or place it inside quotas is up to you.
The <% %> did not write on page, just run the code.
The <%= %> write on the page as the Response.Write
3 Comments
Simon Whitehead
...or just have it evaluated for you with:
var nUserID = "<%= ids.userID %>"
Aristos
@SimonWhitehead But if the user need some check for null ?
Simon Whitehead
Touche - I completely disregarded that part. My apologies. I would still use
<%= %> but wrap the NullRef check in a method :)var nUserID = '<%=((ids != null) ? ids.userID.ToString() : "0")%>';
Comments
Use Something Like this:
<script type="text/javascript">
var nUserID = '<%=ids.userID.ToString()%>';
if(!nUserID)
{
//check for null in javascript
alert(nUserID);
}
</script>
Comments
More appropriate solution would be to to save your ids.userID to data attribute of some related html element or just create invisible div element with all C# data you want to use in your javascript code as data attributes. And then use jQuery to extract that data in scripts.
<div id="settings" style="display: none;" data-user-id="<%= ids.userID %>"></div>
and javascript:
var nUserID = $('#settings').data('user-id');
