Can you display all fields from a SharePoint list without writing them specifically?

Question

Is it possible to retrieve every field value of a SharePoint List Item and display them on a web page without specifically calling them individually? I know it is possible to retrieve all the items but with JSOM and Rest you have to call each field you want displayed (ie oListItem.get_item('Title')). I would like all fields to appear automatically so if I add a new field it will appear without having to update the code.

Answer 1

Get a list of fields first, then iterate them, if needed check for conditions (read only, visible etc.) and then display the values:

var clientContext = new SP.ClientContext.get_current();
var web = clientContext.get_web();
var list = web.get_lists().getByTitle("ListName");
this.listFields = list.get_fields();
clientContext.load(this.listFields);
clientContext.executeQueryAsync(Function.createDelegate(this, 
    this.onListFieldsQuerySucceeded), Function.createDelegate(this, 
    this.onListFieldsQueryFailed));

function onListFieldsQuerySucceeded() {
    var fieldEnumerator = listFields.getEnumerator();
    while (fieldEnumerator.moveNext()) {
        var oField = fieldEnumerator.get_current();
        var fieldValue = oField.get_item(oField.internalName)
    }
} 

Lookup field values are displayed in a different way, for example:

var fieldLookup = item.get_item('LastName');
var fieldLookupValue = fieldLookup.get_lookupValue();

So before getting the value of a field, check for it's type:

var fType = oField.get_fieldTypeKind();
if(fType === SP.FieldType.lookup) {
    oField.get_item('Department').get_lookupValue()
}

You can find SP.FieldType enumeration here

Hope this helps.