Hello,
I'm trying to understand the petstore sample and I hoped someone could
help me understand how the following code works.
function main(funName) {
var fun = this[funName];
var args = new Array(arguments.length -1);
for (var i = 1; i < arguments.length; i++) {
args[i-1] = arguments[i];
}
getPetStore();
fun.apply(args);
}
What I understand here is that the only purpose of the function called
"main" is to be sure that it is called each time a request matches *.do
<map:match pattern="*.do">
<map:call function="main">
<map:parameter name="page" value="{1}"/>
</map:call>
</map:match>
I don't understand why we fetch other arguments, arguments.length should
always equal one.
I tried to copy-paste this in my own application because I need that
too. It doesn't work. In my application fun stays empty so
fun.apply(args) doesn't work ...
In my application funName takes the value of the "page" parameter
Also I don't any function called "apply" in javascript and I don't
understand what this[funName] should return... I'm lost here.
Also I don't understand something else in the pagination management (for
example in the function viewCategory() in petstore.js)
I don't get why we need the cocoon.createPageLocal().
>From what I understand about continuations, Cocoon automatically creates
a continuation when we call sendPageAndWait(). So Cocoon should
automatically remember the values of rowcount and skipmaxresults without
having to call createPageLocal(). There's something that I don't get
here.
The code is below. Thanks in advance for your help and the time given.
Philippe
function viewCategory() {
var categoryId = cocoon.request.get("categoryId");
var category = getPetStore().getCategory(categoryId);
var maxResults = MAX_RESULTS;
/* page local variable to keep track of pagination */
var local = cocoon.createPageLocal();
local.skipResults = 0;
while (true) {
var productList =
getPetStore().getProductListByCategory(categoryId,
local.skipResults,
maxResults);
local.lastPage = !productList.isLimitedByMaxRows;
local.rowCount = productList.rowCount;
var contextData = {
accountForm: accountForm,
productList: productList.rows,
category: category,
firstPage: local.skipResults == 0,
lastPage: local.lastPage
};
cocoon.sendPageAndWait("view/Category" + EXT,
contextData,
function () {
/* release contextData and
productList */
contextData = null;
productList = null;
});
var page = cocoon.request.get("page");
if (page == "previous") {
if (local.skipResults != 0) {
local.skipResults -= maxResults;
}
} else if (page == "next") {
if (!local.lastPage) {
local.skipResults += local.rowCount;
}
}
}
}
I also
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