SHAREPOINT 2013:如何使用javascript CSOM用数组的内容更新网站列

我是Sharepoint 2013的新手，我正在尝试用数组的内容更新网站列的内容，我可以检索和可视化我的网站列的属性，用户可以更改和保存必要的部分，并且更改保存到数组中，现在我必须用数组的属性更新网站列，但出于某种原因，我无法做到这一点，有什么建议/例子吗？到目前为止，这是我的代码，用于检索、可视化站点列并将mofication存储到我的数组中。

<body>
<select id="dropdown" name="dropdown" onchange="optSelect()">
<option value="EngineType_Cylinders">EngineType_Cylinders</option>
<option value="EngineType_EngineCycle">EngineType_EngineCycle</option>
<option value="EngineType_EngineFamily">EngineType_EngineFamily</option>
<option value="EngineType_Euro">EngineType_Euro</option>
<option value="EngineType_FamilyEvolution">EngineType_FamilyEvolution</option>
<option value="EngineType_GasEmissionLevel">EngineType_GasEmissionLevel</option>
<option value="EngineType_Power">EngineType_Power</option>
<option value="EngineType_PowerSupply">EngineType_PowerSupply</option>
<option value="EngineType_Use">EngineType_Use</option>
</select><br />
<textarea id="textareadisplay" rows="25" cols="23"></textarea><br />
<input type ="button" value="Update values" onclick="addItemsToColumns()" />
</body>

我的Javascript

$(function () {
SP.SOD.executeOrDelayUntilScriptLoaded(Function.createDelegate(this, function () {
var select = document.getElementById('dropdown').value;
console.log(select);
getSiteColumns(select);
}), 'SP.js');
});
var fieldChoice;
var choices;
var addFields = [];
var slc;
var clientContext;
function optSelect() {
slc = document.getElementById('dropdown').value;
getSiteColumns(slc);
}
function getSiteColumns(selection) {
clientContext = SP.ClientContext.get_current();
if (clientContext != undefined && clientContext != null) {
var web = clientContext.get_web();
fieldChoice = clientContext.castTo(web.get_availableFields().getByTitle(selection), SP.FieldChoice);
clientContext.load(this.fieldChoice);
clientContext.executeQueryAsync(Function.createDelegate(this, this.OnLoadSuccess), Function.createDelegate(this, this.OnLoadFailed));
}
}
function OnLoadSuccess(sender, args) {
choices = fieldChoice.get_choices();
var textarea = document.getElementById("textareadisplay");
textarea.value = choices.join("n");
}
function OnLoadFailed(sender, args) {
alert('Request failed. ' + args.get_message() + 'n' + args.get_stackTrace());
}
function addItemsToColumns() {
clientC = SP.ClientContext.get_current();
var arrayForUpdate = $('#textareadisplay').val().split('n');
fieldChoice.set_item(, arrayForUpdate);
fieldChoice.update();
clientContext.executeQueryAsync(function () { }, function () { });

}
function OnUpdateSuccess(sender, args) {
var newchoices = fieldChoice.get_choices();
}

我的问题是函数addItemsToColumns()，请帮忙！提前谢谢。

修改示例

以下修改后的示例应该可以做到这一点：

SP.SOD.executeFunc('SP.js', 'SP.ClientContext', function() {
var fieldName = $('#dropdown').find(":selected").text();   //get selected column
populateValues(fieldName);
});

function populateValues(fieldName)
{
getFieldChoice(fieldName,
function(field){
var values = field.get_choices();             
$("textarea#textareadisplay").val(values.join("n"));
},
function(sender,args){
console.log(args.get_message());  //handle errors..
});
}

function addItemsToColumns() {
var fieldName = $('#dropdown').find(":selected").text();   //get selected column
var values = $('textarea#textareadisplay').val().split('n');
updateFieldChoice(fieldName,values,
function(field){
console.log(String.format('{0} field has been updated',fieldName)); 
},
function(sender,args){
console.log(args.get_message());  //handle errors..
});
}

//SharePoint specific function for getting choice column 
function getFieldChoice(fieldTitle,success,failure) {
var ctx = SP.ClientContext.get_current();
var web = ctx.get_web();
var fieldChoice = ctx.castTo(web.get_fields().getByTitle(fieldTitle), SP.FieldChoice);
ctx.load(fieldChoice);
ctx.executeQueryAsync(
function(){
success(fieldChoice)
},
failure);
}
//SharePoint specific function for updating choice column
function updateFieldChoice(fieldTitle,choiceValues,success,failure) {
var ctx = SP.ClientContext.get_current();
var web = ctx.get_web();
var fieldChoice = ctx.castTo(web.get_fields().getByTitle(fieldTitle), SP.FieldChoice);
fieldChoice.set_choices(choiceValues);
fieldChoice.update();
ctx.executeQueryAsync(
function(){
success(fieldChoice)
},
failure);
}

一些建议

更喜欢SP.SOD.executeFuncSP.SOD.executeOrDelayUntilScriptLoaded，因为它支持加载需求脚本
避免全局变量

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