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Writing JSP code inside JS

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posted 15 years ago

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I am using Struts Framework in a User Management portfolio(Web Based) in JBOSS.I want to assign a JS variable from a JSP variable.,But it is not working can anyone help me.

The code is like that
var userName=<%request.getSession().getAttribute("userName");%>

Ulf Dittmer

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posted 15 years ago

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You're missing an equals sign, and a couple of double quotes:

prash patil

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posted 15 years ago

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Hi Suddhasattwa,

I am not very much sure but you can try this..
var userName=<%=request.getSession().getAttribute("userName");%>

regards,
PP

sudhir nim

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posted 15 years ago

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Title says, you want to write jsp code inside .js file, is it?

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Kaizar Laxmidhar

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posted 15 years ago

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Hi,

JSP expression should always contain string value where as getAttribute returns object therefore needs to cast to String. And semicolon (;) is not required at the end.
Hope this should work.
var userName=<%=(String)request.getSession().getAttribute("userName")%>

regards,
Kaizar

Ulf Dittmer

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The (String) cast is not necessary, as the object's toString method will be called automatically.

Quotes, on the other hand, are essential.

Kaizar Laxmidhar

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Hi Ulf,

Semicolon at the end required only if it is JSP scriptlet that is <% ... %>
But not required if it JSP expression that is <%= ... %>

Regards,
Kaizar

Suddhasattwa Mukherjee

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posted 15 years ago

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Dear All,
all the suugesstions so far is not working...Can anyone have any suggestion...Also if you have diifferent idea of assigning the value of JS in Struts framework please provide me..
Thanks

Ulf Dittmer

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What does "is not working" mean? What is being generated?

Kaizar Laxmidhar

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Hi,

1. Define hidden element in jsp file and assign userName value

<html:form action="/SomeAction">

<html:hidden property="userName" value="<%=(String)request.getSession().getAttribute("userName")%>" />

</html:form>

2. in JS do the following

var vUserName = document.getElementsByName("userName");

regards,
Kaizar

Bear Bibeault

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posted 15 years ago

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Originally posted by Kaizar Laxmidhar:

1. Define hidden element in jsp file and assign userName value

Completely unnecessary!

If the original post had been paying attention, he would have seen that his question has already been answered!

He is simply generating invalid JavaScript syntax!

String literals in JavaScript must be quoted.

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Bear Bibeault

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Just to be clear here. There can be no direct interaction between JSP and JavaScript. JSP executes on the server in order to format the HTML page containing the JavaScript to be sent to the browser.

What's happening here is that the JavaScript is being dynamically generated. And it must be generated using valid syntax. You can easily see what is being sent to the browser by doing a View Source in the browser.

Those who are unclear on this may find this article helpful.

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