1. how to get value
var context = new SP.ClientContext.get_current();
var web = context.get_web();
var list = web.get_lists().getByTitle(listTitle);
var listItem = list.getItemById(1);
context.load(listItem);
context.executeQueryAsync(
function() {
var lookupVals = listItem.get_item(fieldName); //get multi lookup value (SP.FieldLookupValue[])
for(var i = 0;i < lookupVals.length;i++) {
console.log(lookupVals[i].get_lookupId()); //print Id
console.log(lookupVals[i].get_lookupValue()); //print Value
}
},
function(sender,args){
console.log(args.get_message());
}
);
2. how to update value
var context = new SP.ClientContext.get_current();
var web = context.get_web();
var list = web.get_lists().getByTitle(listTitle);
var listItem = list.getItemById(1); var lookupVals = [];
//set 1st Lookup value
var lookupVal1 = new SP.FieldLookupValue();
lookupVal1.set_lookupId(1);
lookupVals.push(lookupVal1);
//set 2nd Lookup value
var lookupVal2 = new SP.FieldLookupValue();
lookupVal2.set_lookupId(2);
lookupVals.push(lookupVal2); listItem.set_item(fieldName,lookupVals);
listItem.update(); context.executeQueryAsync(
function() {
console.log('Multi lookup field has been updated');
},
function(sender,args){
console.log(args.get_message());
}
);