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Preserve form values across page loads -- i.e. persistent forms. Uses `localStorage` to persist, `jQuery` for utilities.
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| var FormRepo = function ( namespace ) |
| /// |
| /// the namespace to store values in localStorage |
| // should also protect per page, since we could have the same forms in various places |
| this . N = namespace + '.' + window . location . pathname ; |
| > ; |
| $ . extend ( FormRepo . prototype , |
| namespace : function ( key ) |
| return this . N + '.' + key ; |
| > |
| , |
| preserve : function ( $form , iden ) |
| var data = $form . serializeArray ( ) ; |
| localStorage . setItem ( this . namespace ( 'form.' + ( iden || $form . index ( ) ) ) , JSON . stringify ( data ) ) ; |
| > |
| , |
| restore : function ( $form , iden ) |
| var data = localStorage . getItem ( this . namespace ( 'form.' + ( iden || $form . index ( ) ) ) ) ; |
| if ( null == data || $ . isEmptyObject ( data ) ) return ; // nothing to do |
| $ . each ( JSON . parse ( data ) , function ( i , kv ) |
| // find form element, set its value |
| var $input = $form . find ( '[name=' + kv . name + ']' ) ; |
| // how to set it's value? |
| if ( $input . is ( ':checkbox' ) || $input . is ( ':radio' ) ) |
| $input . filter ( function ( ) < return $ ( this ) . val ( ) == kv . value ; >) . first ( ) . attr ( 'checked' , 'checked' ) ; |
| > |
| else |
| $input . val ( kv . value ) ; |
| > |
| > ) ; |
| > //-- fn restore |
| , |
| remove : function ( $form , iden ) |
| localStorage . removeItem ( this . namespace ( 'form.' + ( iden || $form . index ( ) ) ) ) ; |
| > //-- fn remove |
| , |
| all : function ( ) |
| var allData = < >; |
| for ( var i = 0 , l = localStorage . length ; i < l ; i ++ ) |
| allData [ localStorage . key ( i ) ] = localStorage . getItem ( localStorage . key ( i ) ) ; |
| > |
| return allData ; |
| > //-- fn repo.all |
| > ) ; |