Bookmarklet to store and fill in a test form

gistfile1.js

javascript:V=JSON.parse(localStorage['formData']||'{}');M={};F=document.forms;for(i=0;i%3CF.length;i++){E=F[i].elements;for(j=0;j%3CE.length;j++){C=E[j];CT=C.type;if(!C.name||CT=='submit'||CT=='hidden')continue;CN=C.name+':'+(M[C.name]=(M[C.name]||0)+1);CR=CT=='checkbox'||CT=='radio';if(CR&&V[CN]==true)C.checked=true;if(V[CN]&&!CR&&!C.value&&!C.selectedIndex){if(CT=='select-one'){for(k=0;k%3CC.options.length;k++){if(C.options[k].value==V[CN]){C.selectedIndex=k}}}else{C.value=V[CN]}}if(C.value=='-')C.value='';V[CN]=(C.options&&C.selectedIndex%3E-1&&C.options[C.selectedIndex].value)||(CR?C.checked:C.value);}}void(localStorage['formData']=JSON.stringify(V));

Now handles multiple fields with same name

Still working on checkboxes...

Saves checkboxes and radio button groups now

Doesn't handle multiple select controls, but when's the last time you used one of those?