Utilizzo di CSOM per recuperare i campi in un elenco in una vista

Question

Sto cercando di utilizzare il CSOM per recuperare tutti i campi visualizzati in una particolare vista.

Ho bisogno di conoscere il tipo di campo e il campo interno del campo.

Non posso fare:

var list = hostWebContext.get_web().get_lists().getByTitle('any list');
var view = list.get_views().getByTitle("All Items");
fieldsInView = view.get_viewFields();
context.load(fieldsInView);
context.executeQueryAsync(onListSuccess, OnListFail);

.

poiché .get_viewfields () ottiene solo il nome interno e non il tipo di campo .. Quindi cosa ho fatto è per primo riceverò tutti i campi in una lista, e anche i campi in una vista e iterano attraverso i campi inL'elenco e controllare se è anche nella vista, se lo è, lo aggiunge al mio array.

Questo è ciò che ho finora:

function getList() {
    var hostWebContext = new SP.AppContextSite(context, decodeURIComponent(getQueryStringParameter("SPHostUrl")));


    var list = hostWebContext.get_web().get_lists().getByTitle('any list');
    var view = list.get_views().getByTitle("All Items");
    fields = list.get_fields();
    fieldsInView = view.get_viewFields();

    context.load(fields);
    context.load(fieldsInView);

    context.executeQueryAsync(onListSuccess, OnListFail);
}

function onListSuccess() {

    var fieldEnumerator = fields.getEnumerator();

    var fieldArray = new Array();

    while (fieldEnumerator.moveNext()) {
        var oField = fieldEnumerator.get_current();
        var fieldName = oField.get_internalName();



        if (!oField.get_hidden()) {
            var found = $.inArray(fieldName, fieldsInView) > -1;  // DOES NOT WORK!!


            var aField = {
                fieldName: fieldName,
                fieldType: oField.get_fieldTypeKind()
            };


            if (found) { fieldArray.push(aField); }
        }


    }

}

.

Il mio problema Ecco questa riga:

var found = $.inArray(fieldName, fieldsInView) > -1

.

Quando ispeziona i campi variabiliInView, trovo i valori in realtà in qualcosa di simile campiSinview. $ 2_0. $ 1_0 [0] ....

Potrei creare un altro array e semplicemente utilizzare il campo Command FieldsinView.getenumerator () e aggiungere i valori alla nuova matrice, quindi maneggiarlo .. Ma questo sembra una doppia movimentazione.

C'è un'opzione migliore?

Answer 1

Two considerations here:

1. The jQuery inArray function is implemented by calling the native Array indexOf function, if available, otherwise it uses a for loop to cycle through the array elements in search of a match.

2. Your current inArray call doesn't work because, as you've already realized, fieldsInView is a SPFieldCollection, which is an object that internally is really just an array of fields, but the array isn't part of the public API (any variable whose name starts with the $ sign is not meant to be used directly by client code, although, being javascript, nothing can stops you from accessing them, but it's not guaranteed that a future upgrade won't break your code, if you choose to do that).

Performance-wise, I wouldn't really care of first looping through the fieldsInView collection with the enumerator that you get from the getEnumerator function, in order to build an array of pure strings (fields internal names). Then I would use this newly built array as the second argument to the inArray function call. I think that the performance hit would be unnoticeable (how many fields you have in your view? If it some tenths, looping through them would take a fraction of a second).

Otherwise, you can use the lodash library _some function, which enables you to enumerate an array and passing each item to a callback function (which is your search match condition), but returns as soon as it finds a passing value and does not iterate over the entire collection.

Answer 2

$.inArray function expects Array type to be passed, in your case fieldsInView variable is of SP.ViewFieldCollection type. So, in order to use fieldsInView in $.inArray it should be transformed into an Array, for example:

//Convert collection into array 
function collectionToArray(collection)
{
    var items = [];
    var e = collection.getEnumerator();
    while (e.moveNext()) {
       var item = e.get_current();
       items.push(item);                
    }
    return items;
}   

Example:

var context = SP.ClientContext.get_current();
var list = context.get_web().get_lists().getByTitle(listTitle);
var view = list.get_views().getByTitle(viewTitle);
var fieldsInView = view.get_viewFields();
context.load(fieldsInView);
var fields = list.get_fields();
context.load(fields);
context.executeQueryAsync(
    function(){
      var fieldsNames = collectionToArray(fieldsInView); //get field names array 

      var fieldEnumerator = fields.getEnumerator();
      var fieldArray = new Array();
      while (fieldEnumerator.moveNext()) {
        var field = fieldEnumerator.get_current();
        var fieldName = field.get_internalName();
        var found = $.inArray(fieldName, fieldsNames) > -1;
        //The remaining code is ommited for a clarity

      } 


    },
    function(sender,args){
          console.log(args.get_message());
    });

Answer 3

If you're enumerating through all the fields anyways why not just try something like this:

var internalNames = [];
var types = [];
var viewFieldEnum = viewFields.getEnumerator();
while (viewFieldEnum.moveNext()) {
  var currentViewField = viewFieldEnum.get_current();
  var allFieldsEnum = fields.getEnumerator();
  while (allFieldsEnum.moveNext()) {
    var currentField = allFieldsEmum.get_current();
    if (currentViewField === currentField.get_internalName()) {
      internalNames.push(currentField.get_internalName());
      types.push(currentField.get_fieldTypeKind());
    }
  }
}

It may not be the prettiest thing ever written, but would this work for you? Should get you the field internal names and their types.