Get Request Attributes in JavaScript

Question

When loading a page, I have the following in my controller:

request.setAttribute("myAtt", "Testing");

I want to access this in my JSP file. In the HTML section, I am familiar with using things like:

${myAtt} ${requestScope.myAtt}

and the like. However, I've never been sure how to access request parameters in JavaScript. I've tried a number of things, such as:

var jsAtt = ${myAtt};
var jsAtt = '${myAtt}';
var jsAtt = eval(${myAtt});
var jsAtt = eval('${myAtt}');

etc, but nothing seems to work.

Is there a way to grab request attributes via JavaScript? Please no jQuery, servlets, etc. I want pure JavaScript code.

I am kind of amazed I didn't find this already asked. So sorry if it is a duplicate and I just didn't see the orignal.

Snowy Coder Girl · Accepted Answer · 2012-02-07 17:54:38Z

17

Using the following should work.

var jsAtt = '${myAtt}';

I think I stumbled across issues because of trying to dynamically generate the string based off my needs, which JavaScript seems to not like. For example, this would have issues:

var counter = 1;
var jsAtt = '${myAtt' + counter + '}';

JavaScript seems to recognize the request parameter syntax, but only if it's completely predetermined.

answered Feb 7, 2012 at 17:54

Snowy Coder Girl

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1 Comment

DollyShukla Over a year ago

This doesn't work , I tried in this way. > var jsAtt = '${queryCategory}'; > console.log("value is :"+jsAtt); output: value is :${queryCategory}

Mechkov · Accepted Answer · 2011-10-28 19:30:59Z

0

For GET requests you can get the values from the QueryString. Check this page: http://www.thimbleopensource.com/tutorials-snippets/get-request-parameters-using-javascript

I am not sure about POST requests though.

answered Oct 28, 2011 at 19:30

Mechkov

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Comments

Laurent · Accepted Answer · 2020-04-03 08:39:02Z

Put the following code inside the head tag of your jsp page (not in a js file) :

<script type="text/javascript">
var jsAtt = '<%= request.getAttribute("myAtt") %>';
</script>

But your string must NOT contains the simple quote because it will break the interpretation of the String in the jsp.

If you need String with simple quote, you will need, for example, to replace them on the server side by "'" :

request.setAttribute("myAtt", myAtt.replaceAll("'", "&#39;"));

And replace it again in your JSP :

<script type="text/javascript">
var jsAtt = '<%= request.getAttribute("myAtt") %>';
jsAtt = jsAtt.replace(/&#39;/g, "'");
</script>

For Object instead of String, you can use JSON to pass them as a String.

pacman · Accepted Answer · 2011-10-28 19:34:22Z

-1

I have not tested this but have you tried this?

${pageContext.request.myAtt}

answered Oct 28, 2011 at 19:34

pacman

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1 Comment

Snowy Coder Girl Over a year ago

No luck. I don't think JavaScript likes the ${...} syntax at all.

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