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Get List Items - JavaScript

var value = SP.ListOperation.Selection.getSelectedList();
var productcollection;
function getProducts(title) {
    try {
        var context = new SP.ClientContext.get_current();
        var web = context.get_web();
        var list = web.get_lists().getByTitle('product');
        var query = '<View Scope=\'RecursiveAll\'>'+
                                '<FieldRef Name=\'ProductName\'/>' +
                                '<Value Type=\'Text\'>' + title +'</Value>'+
        var camlQuery = new SP.CamlQuery();
        this.productcollection = list.getItems(camlQuery);
        context.load(this.productcollection, 'Include(ProductName, ProductDescription, ProductType, LaunchDate, AvailableQuantity)');
        context.executeQueryAsync(Function.createDelegate(this, this.productsReceived), Function.createDelegate(this, this.failed));
    catch (e) {
function productsReceived() {
    alert('got products');
function failed(sender, args) {
    alert('failed. Message:' + args.get_message());
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