Getting and setting multiple items from a Sharepoint list using CAML query?

Question

I have a SharePoint list Catalog.

Using camlQuery I can get a list item value called Price.

With the following code I get the Price value of the list element which has the ID 5 and store it in a variable price_id5.

var itemprices = {};

// Gets values from Catalogue list; but they can't be used in the Position list because of different formats
function retrieveListItems() {
    var clientContext = new SP.ClientContext.get_current();
    catalogueList = clientContext.get_web().get_lists().getByTitle('Catalog');

    var camlQuery = new SP.CamlQuery(); // initiate the query object
    camlQuery.set_viewXml('<View><Query><Where><In><FieldRef Name=\'ID\'/><Values><Value Type=\'Number\'>5</Value><Value Type=\'Number\'>6</Value><Value Type=\'Number\'>7</Value></Values></In></Where></Query></View>');
    itemColl = catalogueList.getItems(camlQuery);

    // returns the item collection based on the query
    context.load(itemColl);
    context.executeQueryAsync(retrieveListItemsSuccess, retrieveListItemsFail);
}

function retrieveListItemsSuccess() {
    var listItemEnumerator = itemColl.getEnumerator();
    while (listItemEnumerator.moveNext()) {
        var oListItem = listItemEnumerator.get_current();
        itemprices[oListItem.id] = oListItem.get_item('Preis');
        console.log("itemprices 5: " + itemprices[5]);
        console.log("Price of list item at is:" + itemprices[oListItem.id]);
    }
}
// This function is executed if the above call fails
function retrieveListItemsFail(sender, args) {
    alert('Failed to get list items. Error:' + args.get_message());
}

How can I efficiently get the Price value of other list elements and store them in variables like price_id6, price_id7 etc.?

I want to store them in variables in order to set these values in another list, but I don't know how without writing the three functions for every single price..

Answer 1

This is really more of a general JavaScript question than SharePoint-specific, but the easiest way is just to use an array variable: var itemprices = []; and then push the values as you find them itemprices.push(oListItem.get_item('Price'));, and then you can loop through your array when you want to do something with each Price.

Alternatively, you could use a Javascript object, using the IDs as the Key, so var itemprices = {};, then save each value like itemprices[currentId] = oListItem.get_item('Price');

However, looking at your code though, if you have multiple IDs, you put them all in a single caml using the <In> element, for example:

<View><Query><Where><In><FieldRef Name=\'ID\'/><Values><Value Type=\'Number\'>5</Value><Value Type=\'Number\'>6</Value><Value Type=\'Number\'>7</Value></Values></In></Where></Query></View>

and then that way, in your retrieveListItemsSuccess function, your listItemEnumerator.moveNext() will actually loop through all 3 items (or however many ID's are in your query).