Ok, that works - thanks a lot! So, if I understand this right, it's not possible to directly address something with the key? You have to go through the whole collection, right?
Regards, Eric -----Original Message----- From: Gideon, Thomas [mailto:[EMAIL PROTECTED]] Sent: Mittwoch, 9. Oktober 2002 20:58 To: 'Tag Libraries Users List' Subject: RE: JSTL and HashMap: How does it work? With a Map in the <c:forEach/> tag, you need to de-reference the value explicitly in your EL in the nested <c:out/>, like so: stock.numberOfCharts = <c:out value="${stock.numberOfCharts}"/><br> stock.charts = <c:out value="${stock.charts}"/> <c:forEach var="chart" items="${stock.charts}"> <br>-> chart = <c:out value="${chart.value}"/> //-----------------------------------------^^^^^ </c:forEach> The <c:forEach/> tag gets a Set by calling the entrySet() method of the Map, then iterates over that. The Set contains Map.Entry instances which define getKey() and getValue() methods which can be accessed in the usual way, as Java Bean properties, in EL. Thomas Gideon Sr. Software Developer B2eMarkets 301.230.2236 Tel. 301.230.2248 Fax. [EMAIL PROTECTED] www.B2eMarkets.com > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, October 09, 2002 2:03 PM > To: [EMAIL PROTECTED] > Subject: JSTL and HashMap: How does it work? > > > Hi all > > According to the documentation, it's possible to get data > from a HashMap in > JSTL. Unfortunately, it doesn't really work for me... > > Here's the deal: A stock has a collection of charts, thus: > > stock.numberOfCharts = <c:out value="${stock.numberOfCharts}"/><br> > stock.charts = <c:out value="${stock.charts}"/> > <c:forEach var="chart" items="${stock.charts}"> > <br>-> chart = <c:out value="${chart}"/> > </c:forEach> > > results in > > stock.numberOfCharts = 9 > stock.charts = > {1M=ch.xobix.contentgroup.controller.ImageWrapper@f6ae1c, > 2M=ch.xobix.contentgroup.controller.ImageWrapper@20d6b7, > 3M=ch.xobix.contentgroup.controller.ImageWrapper@f08d0f, > 6M=ch.xobix.contentgroup.controller.ImageWrapper@bcfa38, > 1Y=ch.xobix.contentgroup.controller.ImageWrapper@cfaf6e, > 2Y=ch.xobix.contentgroup.controller.ImageWrapper@6989e, > 3Y=ch.xobix.contentgroup.controller.ImageWrapper@dd7a7, > 5Y=ch.xobix.contentgroup.controller.ImageWrapper@c94114, > YTD=ch.xobix.contentgroup.controller.ImageWrapper@cf9bf0} > -> chart = 1M=ch.xobix.contentgroup.controller.ImageWrapper@f6ae1c > -> chart = 2M=ch.xobix.contentgroup.controller.ImageWrapper@20d6b7 > -> chart = 3M=ch.xobix.contentgroup.controller.ImageWrapper@f08d0f > -> chart = 6M=ch.xobix.contentgroup.controller.ImageWrapper@bcfa38 > -> chart = 1Y=ch.xobix.contentgroup.controller.ImageWrapper@cfaf6e > -> chart = 2Y=ch.xobix.contentgroup.controller.ImageWrapper@6989e > -> chart = 3Y=ch.xobix.contentgroup.controller.ImageWrapper@dd7a7 > -> chart = 5Y=ch.xobix.contentgroup.controller.ImageWrapper@c94114 > -> chart = YTD=ch.xobix.contentgroup.controller.ImageWrapper@cf9bf0 > > which is fine. However, how can I address one entry? > If I try > > chart = <c:out value="${stock.charts["1M"]}"/> > > I get > > javax.servlet.ServletException: > /jsp/financialdata/show.jsp(33,40) Attribute > 1M has no value > > By the way, my getCharts() returns a LinkedHashMap (I wanted the same > sequence as when I inserted the objects). Theoretically, > shouldn't I be able > to traverse it like e.g. an ArrayList? > > chart[0] = <c:out value="${stock.charts[0]}"/> > > doesn't give me anything, though... > > > Best regards, > Eric > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
