Mega Code Archive
SmartClient RSS portlet example
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<!-- The following code is revised from SmartClient demo code(SmartClient_70rc2_LGPL.zip).-->
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// SmartClient RSS "portlet" example
// This examples extends the simple RSS DataSource binding example
// with:
// -- more/less buttons
// -- windows (drag, minimize, or close the headlines 'portlet')
// -- hover on headlines for descriptions
// -- click on preview icon to open in new window
// -- click on headline to open in another client-side portlet
// -- enable/disable the buttons appropriately
//
// Possible next steps for this example:
// -- wrap this implementation as a single declarative component
// -- create referenceable components under a portal-specified namespace
// default delay for hover actions is 1000ms (1s) - let's make it shorter for this example
isc.Hover.delay = 400;
Hover.hoverCanvasDefaults.backgroundColor = "#FFFF99";
// bind an RSS feed to a dataSource and specify the fields we want to use
isc.DataSource.create({
ID:"newsFeed",
dataURL:"http://rss.slashdot.org/Slashdot/slashdot",
recordXPath:"//default:item",
fields:[
{name:"title"},
{name:"description"},
{name:"link"}
]
});
// create a listGrid to display headlines from the RSS feed
isc.ListGrid.create({
ID: "headlineGrid",
autoDraw: false,
// connect to the RSS-bound dataSource, but display the 'title' field only
dataSource:"newsFeed",
fields:[
{name:"link", type:"link", linkText:isc.Canvas.imgHTML("[SKIN]/common/view.png", 16, 16), width:22},
{name:"title"}
],
// border on top, no headers, no scrollbars
styleName:"borderT",
showHeader:false,
bodyOverflow:"hidden",
leaveScrollbarGap:false,
// when the user hovers over a headline, show the description
canHover:true,
hoverWidth:300,
cellHoverHTML: function (record) {return record.description},
// when the user clicks on a headline, follow the link in a separate portlet
recordClick:"storyPortlet.setContentsURL(record.link)"
});
// create a toolbar with Less/More buttons
isc.Toolbar.create({
ID:"headlineControls",
buttonConstructor:"IButton",
height:36,
layoutMargin:8,
membersMargin:8,
autoDraw:false,
buttons:[
{ID:"lessBtn", title:"Less...", click:"headlineWindow.showLess()" },
{ID:"moreBtn", title:"More...", click:"headlineWindow.showMore()" }
]
});
isc.Window.create({
ID:"headlineWindow",
title:"Headlines",
left:50, top:50, width:300, height:300,
showCloseButton:false,
numHeadlines:5, // to start with
items:[headlineControls, headlineGrid],
// logic to show more headlines and enable/disable the buttons appropriately
showMore: function () {
var rssData = headlineGrid.data;
this.numHeadlines = this.numHeadlines + 3;
// stop when we hit the end of the feed (first check that the feed is valid, to avoid errors)
if (isc.isA.ResultSet(rssData) && rssData.lengthIsKnown() && this.numHeadlines >= rssData.getLength()) {
this.numHeadlines = rssData.getLength();
moreBtn.disable();
}
this.fitHeadlines();
lessBtn.enable();
},
// logic to show fewer headlines and enable/disable the buttons appropriately
showLess: function () {
this.numHeadlines = this.numHeadlines - 3;
if (this.numHeadlines <= 0) {
this.numHeadlines = 0;
lessBtn.disable();
}
this.fitHeadlines();
moreBtn.enable();
},
// resize to fit the current number of headlines, plus extra space for the
// window header, toolbar, and edges
fitHeadlines: function () {
this.setHeight(headlineGrid.cellHeight * this.numHeadlines + 75);
}
});
isc.Window.create({
title:"Full Story",
left:400, top:50, width:600, height:500,
canDragResize:true,
showCloseButton:false,
showMinimizeButton:false,
items:[Canvas.create({
ID:"storyPortlet", contentsType:"page", overflow:"auto"
})]
});
headlineGrid.fetchData();
headlineWindow.fitHeadlines();
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</BODY>
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