while循环中的Return语句莫名其妙地过早退出函数

Question

我是Javascript的新手，但我尝试创建一个代码，访问Sharepoint-list。我有这段代码来访问列表"Mytasks"，我想要获取select-tag中的项目。现在它只显示列表的第一项。我找不到问题所在。

​

// load all necessary sharepoint javascript libaries
SP.SOD.executeFunc('sp.js', 'SP.ClientContext', function () {

	// load the sharepoint list.
	loadSharepointList();
});

// loads the sharepoint list
function loadSharepointList() {

	// create the sharepoint content.
	var context = SP.ClientContext.get_current();

	// get the list by the title.
	var list = context.get_web().get_lists().getByTitle('myTasks');

	// create the query.
	var caml = new SP.CamlQuery();
	caml.set_viewXml("<Query><Where><IsNotNull><FieldRef Name='Title' /></IsNotNull></Where></Query>");

	// get the list items asynchronously
	var listItems = list.getItems(caml);
	context.load(listItems, 'Include(Title)');
	context.executeQueryAsync(

    	// success delegate
    	Function.createDelegate(this, function () {
    	
    		// loop through the items.
    		var listEnumerator = listItems.getEnumerator();
    		while (listEnumerator.moveNext()) {

    			// get the current list item.
    			var listItem = listEnumerator.get_current();

    			// get the field value.
    			var fieldValue = listItem.get_item('Title');
				
    			var list = document.getElementById("tstList");
    			var option = document.createElement("option");
    			option.text = fieldValue;
    			list.add(option);
    		//	console.log(fieldValue);
    			return "<option>" + fieldValue + "</option>";
    			
    		}
     	}),

    	// error delegate
    	Function.createDelegate(this, function () {
    		alert('Error fetching data from Sharepoint!');
    	}));

}

​

有什么想法吗？

Answer 1

我解决了我的问题。我将行var list = document.getElementById("tstList")；移到了while循环之前，并将返回移到了循环之后。所以现在一切都好了。谢谢你的回答。