i assume that view form has ID of request in query string:
like this DispForm.aspx?ID=35&Source=...
so you can use own function to open New form with your query string for example NewForm.aspx?CopyID=35
In New form there will be function to cheeck if query string CopyID is present and if so, it will load Item with ID=35 from reuqests list and then prefill newform fields with loaded data. I have done this (with one exeption i loaded last created item).
Code after item is loaded (just to prefill standard newform):
$("td.ms-formbody").each(function(){ if($(this).html().indexOf('FieldInternalName="')<0) return; var start = $(this).html().indexOf('FieldInternalName="')+19; var stopp = $(this).html().indexOf('FieldType="')-6; var internal_name = $(this).html().substring(start,stopp); if (internal_name=="INTERNAL NAME OF FIELD THAT SHOULD BE PREFILLED") { var stopp2 = stopp+17; var field_type = ""; while ($(this).html()[stopp2]!="\"") { / field_type += $(this).html()[stopp2]; stopp2 += 1; } switch (field_type) { case "SPFieldText": if ($(this).find('input').length > 0) { $(this).find('input').val(loaded_item.get_item(internal_name)); } break; case "SPFieldNote": //TextField_inplacerte (RichEdit enhaced text) if ($(this).find("div[id$='TextField_inplacerte']").length > 0) { $(this).find("div[id$='TextField_inplacerte']").html(loaded_item.get_item(internal_name)); } break; case "SPFieldChoice": if ($(this).find('select option').length > 0) { $(this).find('select option').each(function(){ if($(this).text() === loaded_item.get_item(internal_name)){ $(this).prop('selected',true).trigger("change"); } }); } break; default: console.log ("error"); return; } } });
The code just checks all fields in newform (their internal_name), check if this field should be prefilled with loaded data (change "INTERNAL NAME OF FIELD THAT SHOULD BE PREFILLED") and then write that data in field.
Better approach could be to create own custom new form with html logic to better prefill data...
