Search Items from a List

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\'>'+
                        '<Query>'+
                            '<Where>'+
                            '<Contains>'+
                                '<FieldRef Name=\'ProductName\'/>' +
                                '<Value Type=\'Text\'>' + title +'</Value>'+
                            '</Contains>'+
                            '</Where>'+
                        '</Query>'+
                             '</View>';
        var camlQuery = new SP.CamlQuery();
        camlQuery.set_viewXml(query);

        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) {
        alert(e);
    }
}
function productsReceived() {
    alert('got products');
    prcessProducts(this.productcollection);
}
function failed(sender, args) {
    alert('failed. Message:' + args.get_message());
}