Moving round content dynamically - xpages

Question

I have an xpage, where fields are created dynamically. By default, there are 3, but you can click a button to add as many as you like, naming convention "ObjectiveDetails1", "ObjectiveDetails2" and so on.
I am trying to handle blank fields... For example, there is content in fields 1 and 2, nothing in 3 and 4, but content in 5. What I want to do, is shift content from field 5 into the first available blank, in this case 3. Likewise, if there is content in fields 1, 2, 4, 5, I then need content in 4, to go into field 3, and content in 5 to go into field 4 etc. At the moment, I'm managing to shift content up 1 only.
So if fields 2, 3, 4 are blank but 5 has content, it only moves the content into 4, where-as I need it to move into field 2.
I hope I've explained this well enough..... Current code is a little messy....
for (var i = 1; i < viewScope.rows+1; i++) {
print("Starting Array.....");
if(applicationScope.get("BreakAllCode")==true){
break;
}
var objFieldName:string = "ObjectiveDetails" +i;
print ("Field Name: " + objFieldName);
var fieldValue = document1.getItemValueString(objFieldName);
print ("Field Value: " + fieldValue);
if (fieldValue =="" || fieldValue==null){
print("EMPTY");
// We now need to delete the 3 fields related to this objective
var updFieldName:string = "ObjectiveUpdates" +i;
var SAFieldName:string = "ObjectiveSelfAssessment" +i;
// Before we delete the fields, we need to check if the next field is blank
// and if not, copy its contents into this field.
for (var n =i+1; n < viewScope.rows+1; n++) {
if(applicationScope.get("BreakAllCode")==true){
break;
}
if(document1.hasItem("ObjectiveDetails" +n)){
print("Next field: " +"ObjectiveDetails" +n);
var nextFieldValue = document1.getItemValueString("ObjectiveDetails" +n);
if (!nextFieldValue =="" || !nextFieldValue==null){
// Now copy the content into the field
var nextFieldName:string = "ObjectiveDetails" +n;
var previousNo = n-1;
var previousFieldName:string = "ObjectiveDetails" +previousNo;
print ("Previous field: " + previousFieldName);
document1.replaceItemValue(previousFieldName,nextFieldValue);
// Now clear the content from next field
document1.replaceItemValue(nextFieldName,"");
}else{
// Do nothing
}
}else{
print("Last field");
}
}
// Remove items from the document
//document1.removeItem(objFieldName);
//document1.removeItem(updFieldName);
//document1.removeItem(SAFieldName);
// Remove fields from our arrays
//viewScope.fields.splice(i-1, 1);
//viewScope.fields2.splice(i-1, 1);
//viewScope.fields3.splice(i-1, 1);
// Update the row variable
//viewScope.rows--;
//document1.replaceItemValue("rows",viewScope.rows);
//document1.save();
// We now need to "re-index" the array so that the fields are numbered corectly
}else{
print("We have a value");
}
}
Update with beforePageLoad:
viewScope.rows = document1.getItemValueInteger("rows");
var rowCount:integer = viewScope.rows;
var newCount:integer = 0;
while(newCount<rowCount){
if (!viewScope.fields) {
viewScope.fields = [];
viewScope.fields2 = [];
viewScope.fields3 = [];
}
viewScope.fields.push("ObjectiveDetails" + (viewScope.fields.length + 1));
viewScope.fields2.push("ObjectiveUpdates" + (viewScope.fields2.length + 1));
viewScope.fields3.push("ObjectiveSelfAssessment" + (viewScope.fields3.length + 1));
newCount++;
}

Answer 1

This should be your core algorithm:
var writeIndex = 0;
for (var readIndex = 1; readIndex <= viewScope.rows; readIndex++) {
var value = document1.getItemValueString("ObjectiveDetails" + readIndex);
if (value) {
writeIndex++;
if (readIndex !== writeIndex) {
document1.removeItem("ObjectiveDetails" + readIndex);
document1.replaceItemValue("ObjectiveDetails" + writeIndex, value);
}
} else {
document1.removeItem("ObjectiveDetails" + readIndex);
}
}
viewScope.rows = writeIndex;
The code
deletes all empty fields,
renames fields to ObjectiveDetails1, ObjectiveDetails2, ObjectiveDetails3,... and
writes the resulting number of rows back to viewScope variable "rows".

Answer 2

If I understood your problem correctly, then this code should work (not tested):
// define variables
var i,j,nRows,values,value,allowContinue,fieldname;
// collect values from document fields
nRows=viewScope.rows;
values=[];
for (i=0;i<nRows;i++) {
values.push(document1.getItemValueString("ObjectiveDetails"+(i+1).toFixed(0)));
}
// fill empty values
for (i=0;i<nRows-1;i++) {
if (values[i]) continue;
allowContinue=false;
for (j=i+1;j<nRows;j++) {
if (value=values[j]) {
values[i]=value;
values[j]="";
allowContinue=true;
break;
}
}
if (!allowContinue) break;
}
// write back to document and remove empty fields on the end
for (i=0;i<nRows;i++) {
fieldname="ObjectiveDetails"+(i+1).toFixed(0);
if (value=values[i]) document1.replaceItemValue(fieldname,value);
else document1.removeItem(fieldname);
}