Pass session attribute from jsp to javascript function

Question

I'm trying to pass a HTTP Session attribute from a JSP page to a JavaScript function written in external JS file. When I'm writing JS part in body section without writing specific function it works fine but when I declare a function and try to pass session attribute as a parameter it gives following error.

SyntaxError: syntax error

I have tried following methods to pass session attribute to JS function:

<body onload="popListbox(<%=session.getAttribute("objNames")%>)">

<body onload="popListbox(${objNames})">

after execution body tag looks like this:

<body national_id","birth_certificate"])"="" onload="popListbox(["></body>

Can someone tell me why body tag looks like above and how should I pass the parameter to JS function.

there should be another quote at the start of national_id and also a box bracket is missing.. — Santino 'Sonny' Corleone
– Santino 'Sonny' Corleone, Commented Mar 17, 2014 at 7:03
Try setting the onload value with single quotes, not double quotes. The result of session.getAttribute() is using double quotes, so the nested quoting is messed up — Ian
– Ian, Commented Mar 17, 2014 at 7:05
@Santino'Sonny'Corleone actually whole national_id","birth_certificate"])"="" part should be in popuListbox fuction call as a parameter but its get misplaced after execution. thats the problem i face — Sajith Rupasinghe
– Sajith Rupasinghe, Commented Mar 17, 2014 at 7:06
@Sajirupee try this <body onload="popListbox(<%=session.getAttribute('objNames')%>)"> — Santino 'Sonny' Corleone
– Santino 'Sonny' Corleone, Commented Mar 17, 2014 at 7:13

ThiefMaster · Accepted Answer · 2014-03-17 07:21:16Z

1

You could use single quotes for the attribute, i.e. onload='...' - right now your data string contains double quotes which break everything as they terminate the attribute.

However, it would be much better to keep using double quotes and HTML-escape any special characters (", &, < and >) in objNames! That way you don't get any problems if the data contains single quotes somewhere.

answered Mar 17, 2014 at 7:21

ThiefMaster

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Santino 'Sonny' Corleone · Accepted Answer · 2014-03-17 07:25:40Z

0

I guess your quotes are creating a problem.i.e they are conflicting..Try using single quotes...

<body onload='popListbox(<%=session.getAttribute("objNames")%>)'>

edited Mar 17, 2014 at 7:25

answered Mar 17, 2014 at 7:16

Santino 'Sonny' Corleone

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3 Comments

ThiefMaster Over a year ago

Those quotes are fine as they are part of server-side code. The actual problem lies in the fact that his function returns JSON which uses double quotes.

Santino 'Sonny' Corleone Over a year ago

@ThiefMaster v meet again(if u remember that is)...even i had a similar problem before but i solved with single quote as in my answer

Sajith Rupasinghe Over a year ago

Using single quotes for attribute names gives an error. but replacing double quotes in onLoad event resolved my issue. thank you for your help.

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