Finding out if any modifications are being made in thefields in an editable datagrid

[kchamarthi]

Hi,
I populated my data grid with an array
collection(initDG=event.result.categorydtls.catego ry) where initDGObject is the
array collection.I made the data grid as editable.Now , when the user click's
on submit(below data grid), the request for modifying the corresponding details
in database should go only if the user makes any modification ,or else an alert
should be shown saying that "you havent made any modifications".For this
purpose i assigned "event.result.categorydtls.category" to another array
collection initDGObject and ,in the function which will be invoked after
clicking on submit i compared both the objects initDG and initDGObject.But to
my surprise,if any field in data grid is modified then both initDG and
intiDGObject(here let me remind that i assigned initDG as the data provider for
grid and initDGObject is a normal array collection object for which the details
are assigned to for comparison purpose) are also modifying.So i am unable to
check if any modifications are being made before forwarding request for
database modification to back end.Please suggest me a solution for doing this
task.Thanks in advance.

//Function for populating datagrid
public function subcategoriesResults(event:ResultEvent):void {
Alert.show("Iam in the result handler for getDetails");
//var res:String;
var xArray:Array;
objCat=null;
initDG=null;
try
{

//Alert.show("Value is:"+event.message.body.toString());
initDGObject=event.result.categorydtls.category;
initDG=event.result.categorydtls.category;
subCategories.dataProvider=initDG;
}
catch(error:Error){

//Alert.show("Sorry you have no subcategories");
try{
objCat=event.result.categorydtls.category;
objToCheck=objCat;
subCategories.dataProvider=objCat;
}
catch(error:Error){
Alert.show("Sorry you have no subcategories");
subCategories.dataProvider=null;
}

}

}
//Function which checks if any modifications are done and forwards request
based on that
public function updateSubCategory():void {
var msg:String = "";
var flag:Number=0;
if(initDG != null){
if(initDG.length>1){
//Alert.show("the message is here");
var
check:int=ObjectUtil.compare(initDGObject,subCateg ories.dataProvider,0);//comapr
ing the two arraycollection objects
Alert.show(check.toString());
if(check!=0)
{
for (var i:Number=0; i<initDG.length; i++)
{

if(initDG[i].catg_status=="I" || initDG[i].catg_status=="A")
{
msg += initDG[i].catg_name + "," + initDG[i].catg_desc+"," +
initDG[i].catg_status+","+initDG[i].catg_id+"#";
}
else
{
Alert.show("I(Inactive) and A(Active) are the only characters allowed for
the category status");
getDetails(storeParent);
return;
}

}
}
else
{
Alert.show("Please edit the category details before clicking on
Submit");
return;
}
}
}
else if(objCat!=null)
{
if((objToCheck.catg_name==objCat.catg_name) &&
(objToCheck.catg_desc==objCat.catg_desc) &&
(objToCheck.catg_status==objCat.catg_status))
{
Alert.show("Please edit the topic details before clicking on submit");
return;
}
if(objCat.catg_status=="I" || objCat.catg_status=="A")
msg += objCat.catg_name + "," + objCat.catg_desc+"," +
objCat.catg_status+","+objCat.catg_id+"#";
else
{
Alert.show("I(Inactive) and A(Active) are the only characters allowed for
the category status");
getDetails(storeParent);
return;
}
}
//Alert.show("Message is"+msg);
var objParams:Object = new Object ();
objParams.msg=msg;
subCategoriesUpdateServ.url=subCatUrl+"?submit=upd ate";
subCategoriesUpdateServ.send(objParams);
//Alert.show("msg========="+msg);
}

[atta707]

[url]http://blog.paranoidferret.com/index.php/2007/08/24/flex-php-json-mysql-advanced-updating/[/url]

Essentially, you'll be listening for collection change event for your collection.

ATTA

[kchamarthi]

Thanks for that reply..It worked when the datagrid is populated with an array
collection...but when the datagrid is populated with an object(which is the
case when a single record is to be displayed in datagrid)it is not possible
since we cant add an event listener for an object.Please suggest me a solution.

[atta707]

You could always add that single object into a array collection. That's what, by the way, what data grid does for you implicitly.

ATTA

[kchamarthi]

lam not able to add a single object to the array collection.Regarding the usage
of datagrid in my task,there will be a drop down on the top of datagrid with
categories(like science,maths...)in it.Whenever a particular category is
selected then the corresponding subcategories(in category science sub
categories are physics,biology.....)details will be populated in the
datagrid.Please suggest me a solution.