javascript - 从executeQueryAsync检索参数，javascript

我正在尝试从成功方法中检索参数，并使用Javascript ECMA脚本执行executeQueryAsync。

我在这里尝试了建议

http://www.learningsharepoint.com/2013/08/07/passing-parameters-to-success-method-in-executequeryasync-sharepoint/

但是我在MicrosfotAjax.js文件中收到以下错误：

“ Collection尚未初始化。尚未请求或尚未执行请求。可能需要显式请求。”在警报中（_returnParam）;命令时，我得到一个未定义的值，相反它应该说“ hello”。在获得成功函数以返回listItemInfo数组之前，我想演示一个简单的变量返回。

谢谢您的考虑

function Tblsrch(camlstr){
var siteUrl = '/sites/SIandT%20Project%20Intelligence';
var hello;
var clientContext = new SP.ClientContext(siteUrl);
var oWebsite = clientContext.get_web();
var oList = oWebsite.get_lists().getByTitle('ISATestdata');
var camlQuery = new SP.CamlQuery();

camlQuery.set_viewXml(camlstr);

    this.collListItem = oList.getItems(camlQuery);
    var _returnParam;

clientContext.executeQueryAsync(Function.createDelegate(this, function(){_returnParam = onQuerySucceeded();}), Function.createDelegate(this, this.onQueryFailed));

alert(_returnParam);

}

    function onQuerySucceeded(sender, args){
       var listItemInfo = new Array();
       var rowInd = 0;
        var hello;
                    var listItemEnumerator = collListItem.getEnumerator();

            while (listItemEnumerator.moveNext()) {
            var oListItem = listItemEnumerator.get_current();
           // listItemInfo += '\nType:' + oListItem.get_item('Name2') + ' | ' + oListItem.get_item('Plan') + ' | ' + oListItem.get_item('Type1');

            listItemInfo[rowInd] = new Array(10);
            listItemInfo[rowInd][0] =oListItem.get_item('Name2');
            listItemInfo[rowInd][1] =oListItem.get_item('Type1');
            listItemInfo[rowInd][2] = oListItem.get_item('Plan');
            listItemInfo[rowInd][3] = oListItem.get_item('Analyse');
            listItemInfo[rowInd][4] = oListItem.get_item('Design');
            listItemInfo[rowInd][5] = oListItem.get_item('Build');
            listItemInfo[rowInd][6] = oListItem.get_item('Test');
            listItemInfo[rowInd][7] = oListItem.get_item('Run');
            listItemInfo[rowInd][8] = oListItem.get_item('SupportMaintenance');
            listItemInfo[rowInd][9] = oListItem.get_item('Link1');
            listItemInfo[rowInd][10] = oListItem.get_item('Link2');

            rowInd++;
        }
        alert(listItemInfo[0][0] + " " + listItemInfo[0][1] + " " +listItemInfo[0][2] + " " + listItemInfo[0][3] + " " +listItemInfo[0][4] + " " );
    var _returnParam = "hello";
return _returnParam;
    }

function onQueryFailed(sender, args){
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

最佳答案

clientContext.executeQueryAsync(Function.createDelegate(this, function(){_returnParam = onQuerySucceeded();}), Function.createDelegate(this, this.onQueryFailed));

alert(_returnParam);

这是正常的。 executeQueryAsync是异步的，因此会调用executeQueryAsync（=完成AJAX请求），然后立即在不等待AJAX​​完成的情况下，调用_returnParam仍然为空的alert(_returnParam)。

如果要执行其他操作，则需要在onQuerySucceeded的末尾调用另一个函数。

顺便说一句，我一直认为Microsoft的方法确实很难使用。如果您有兴趣，我已经创建了一个用于处理Sharepoint的库（称为SharepointPlus）。对于您要实现的目标，代码将是这样的（我也使用数组检查了您的代码）：

$SP().list("ISATestdata", "/sites/SIandT%20Project%20Intelligence").get({fields:"Name2,Type1,Plan,Analyse,Design,Build,Test,Run,SupportMaintenance,Link1,Link2",where:"Name2 = 'Something'"}, function(data) {
  var listItemInfo = [];
  for (var i=0, len=data.length; i<len; i++) {
    listItemInfo[i] = [];
    listItemInfo[i].push(data[i].getAttribute("Name2"));
    listItemInfo[i].push(data[i].getAttribute("Type1"));
    listItemInfo[i].push(data[i].getAttribute("Plan"));
    listItemInfo[i].push(data[i].getAttribute("Analyse"));
    listItemInfo[i].push(data[i].getAttribute("Design"));
    listItemInfo[i].push(data[i].getAttribute("Build"));
    listItemInfo[i].push(data[i].getAttribute("Test"));
    listItemInfo[i].push(data[i].getAttribute("Run"));
    listItemInfo[i].push(data[i].getAttribute("SupportMaintenance"));
    listItemInfo[i].push(data[i].getAttribute("Link1"));
    listItemInfo[i].push(data[i].getAttribute("Link2"));
  }

  alert(listItemInfo[0][0] + " " + listItemInfo[0][1] + " " +listItemInfo[0][2] + " " + listItemInfo[0][3] + " " +listItemInfo[0][4] + " " );
})