Sharepoint Online executeQueryAsync JSOM - Return 值

Question

使用 Sharepoint Online 2013 使用 JSOM 构建应用程序。当前部分是在将数据提交到列表（工作正常）之后，将打开一个模式，允许用户从该列表和其他列表创建 PDF。当前的问题是列表中的数据必须在客户端准备好才能开始将其转换为 PDF，我已经阅读了有关 "Promise" 方法的文献，这就是我最近一直在尝试的方法收效甚微。

function getQuoteDetails() {

var d = $.Deferred(function(){

    var ListName = "Quote";
    var context = new SP.ClientContext.get_current();
    var lstObject = context.get_web().get_lists().getByTitle(ListName);
    var camlQuery = new SP.CamlQuery();
    //var _valuetofind = $('#QuoteID').text();
    var _valuetofind = '1';
    camlQuery.set_viewXml("<View><ViewFields>" +
        "<FieldRef Name='Q_ID' />" +
        "<FieldRef Name='CPY_ID' />" +
        "<FieldRef Name='CUST_ID' />" +
        "<FieldRef Name='Q_RaiseDate' />" +
        "<FieldRef Name='Q_DueDate' />" +
        "<FieldRef Name='Q_Price' />" +
        "<FieldRef Name='Q_GST' />" +
        "<FieldRef Name='Q_TotalPrice' />" +
        "<FieldRef Name='Q_PurchaseOrder' />" +
        "</ViewFields>" +
        "<Query><Where><Contains>" +
        "<FieldRef Name='Q_ID'/>" +
        "<Value Type='Number'>" + _valuetofind + "</Value></Contains></Where></Query></View>");

    var listItemCollection = lstObject.getItems(camlQuery);
    context.load(listItemCollection, "Include(Q_ID, CPY_ID, CUST_ID, Q_RaiseDate, Q_DueDate, Q_Price, Q_GST, Q_TotalPrice, Q_PurchaseOrder)");
    context.executeQueryAsync(onGetItemsSuccess, onGetItemsFail);

    function onGetItemsSuccess(sender, args) {
        var listItemEnumerator = listItemCollection.getEnumerator();
        while (listItemEnumerator.moveNext()) {
            var quotearray = [];

            quotearray['Q_ID'] = listItemEnumerator.get_current().get_item('Q_ID');
            quotearray['CPY_ID'] = listItemEnumerator.get_current().get_item('CPY_ID');
            quotearray['CUST_ID'] = listItemEnumerator.get_current().get_item('CUST_ID');
            quotearray['Q_RasiedDate'] = listItemEnumerator.get_current().get_item('Q_RasiedDate');
            quotearray['Q_DueDate'] = listItemEnumerator.get_current().get_item('Q_DueDate');
            quotearray['Q_Price'] = listItemEnumerator.get_current().get_item('Q_Price');
            quotearray['Q_GST'] = listItemEnumerator.get_current().get_item('Q_GST');
            quotearray['Q_TotalPrice'] = listItemEnumerator.get_current().get_item('Q_TotalPrice');
            quotearray['Q_PurchaseOrder'] = listItemEnumerator.get_current().get_item('Q_PurchaseOrder');
        }
        d.resolve(quotearray);

    }

    function onGetItemsFail(sender, args) {
        alert('Failed to get items. Error: ' + args.get_message());
    }

});
return d.promise();

}

此代码随后被调用：

function CreateQuotePDF() {

getQuoteDetails().done(function (quotearray) {
    var quotedetails = quotearray;
    alert('Nothing'); <---- quotedetails is undefined at this point
});

警报（'Nothing'）； <---- quotedetails 此时未定义 }

希望大家帮帮忙！

Answer 1

一些建议

确保您使用的是 jQuery 版本 >= 1.5 因为 Deferred 对象在 jQuery 1.5
不需要同时指定CAMLViewFields和SP.ClientContext.load函数的第二个参数的值因为它们都用于指定要检索的属性
总是喜欢为 SP.ClientContext.executeQueryAsync 函数包含 failed callback 以处理任何发生的错误

话虽如此，我建议您使用以下更通用的方法来获取列表项：

function getListItems(listTitle,propertiesToInclude)
{ 
   var ctx = SP.ClientContext.get_current();
   var web = ctx.get_web();
   var list =  web.get_lists().getByTitle(listTitle);
   var items = list.getItems(SP.CamlQuery.createAllItemsQuery());
   var includeExpr = 'Include(' + propertiesToInclude.join(',') + ')';
   ctx.load(items,includeExpr); 
   var d = $.Deferred();
   ctx.executeQueryAsync(function() {
       var result = items.get_data().map(function(i){
           return i.get_fieldValues();   
       });
       d.resolve(result);
   },
   function(sender,args){
       d.reject(args);
   });
   return d.promise();
}

在这种情况下，可以如下所示检索列表项：

SP.SOD.executeFunc('SP.js', 'SP.ClientContext', function() {

   var listTitle = 'Documents';  //set list title here
   var properties = ['Title','ID'];  //specify items properties here
   getListItems(listTitle,properties)
   .done(function(items){
      console.log(items);
   })
   .fail(function(error){
      console.log(error.get_message()); //if any error is occurred?
    });

});

Sharepoint Online executeQueryAsync JSOM - Return 值

Sharepoint Online executeQueryAsync JSOM - Return Value

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