{"id":635,"date":"2012-01-24T13:31:10","date_gmt":"2012-01-24T21:31:10","guid":{"rendered":"http:\/\/www.auval.com.mx\/notas\/?p=635"},"modified":"2012-01-24T13:31:10","modified_gmt":"2012-01-24T21:31:10","slug":"como-ordenar-una-lista","status":"publish","type":"post","link":"https:\/\/auval.com.mx\/blog\/2012\/01\/24\/como-ordenar-una-lista\/","title":{"rendered":"C\u00f3mo ordenar una lista"},"content":{"rendered":"

Esta es una pregunta que me surgi\u00f3 al estar dise\u00f1ando una lista reordenable por el usuario. Es un tema b\u00e1sico, pero como me tard\u00e9 en recordar c\u00f3mo se hac\u00eda, anexo los pasos.<\/p>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

ID<\/span><\/strong><\/p>\n<\/td>\n

\n

Texto<\/span><\/strong><\/p>\n<\/td>\n

\n

Sig<\/span><\/strong><\/p>\n<\/td>\n

\n

Ant<\/span><\/strong><\/p>\n<\/td>\n<\/tr>\n

\n

1<\/span><\/p>\n<\/td>\n

\n

a<\/span><\/p>\n<\/td>\n

\n

2<\/span><\/p>\n<\/td>\n

\n

-1<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

2<\/span><\/p>\n<\/td>\n

\n

b<\/span><\/p>\n<\/td>\n

\n

3<\/span><\/p>\n<\/td>\n

\n

1<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

3<\/span><\/p>\n<\/td>\n

\n

c<\/span><\/p>\n<\/td>\n

\n

4<\/span><\/p>\n<\/td>\n

\n

2<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

4<\/span><\/p>\n<\/td>\n

\n

d<\/span><\/p>\n<\/td>\n

\n

5<\/span><\/p>\n<\/td>\n

\n

3<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

5<\/span><\/p>\n<\/td>\n

\n

e<\/span><\/p>\n<\/td>\n

\n

6<\/span><\/p>\n<\/td>\n

\n

4<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

6<\/span><\/p>\n<\/td>\n

\n

f<\/span><\/p>\n<\/td>\n

\n

7<\/span><\/p>\n<\/td>\n

\n

5<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

7<\/span><\/p>\n<\/td>\n

\n

g<\/span><\/p>\n<\/td>\n

\n

8<\/span><\/p>\n<\/td>\n

\n

6<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

8<\/span><\/p>\n<\/td>\n

\n

h<\/span><\/p>\n<\/td>\n

\n

9<\/span><\/p>\n<\/td>\n

\n

7<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

9<\/span><\/p>\n<\/td>\n

\n

i<\/span><\/p>\n<\/td>\n

\n

10<\/span><\/p>\n<\/td>\n

\n

8<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

10<\/span><\/p>\n<\/td>\n

\n

j<\/span><\/p>\n<\/td>\n

\n

1000<\/span><\/p>\n<\/td>\n

\n

9<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Esta es una lista.<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

El primer registro tendr\u00e1 esta forma.<\/span><\/span><\/span><\/p>\n\n\n\n\n
\n

ID<\/span><\/strong><\/p>\n<\/td>\n

\n

Texto<\/span><\/strong><\/p>\n<\/td>\n

\n

Sig<\/span><\/strong><\/p>\n<\/td>\n

\n

Ant<\/span><\/strong><\/p>\n<\/td>\n<\/tr>\n

\n

1<\/span><\/p>\n<\/td>\n

\n

a<\/span><\/p>\n<\/td>\n

\n

1000<\/span><\/p>\n<\/td>\n

\n

-1<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0<\/span><\/p>\n

Para insertar un registro despu\u00e9s de un registro \u201cbase\u201d, haremos lo siguiente:<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

base.sig = insertado.id<\/span><\/span><\/span><\/p>\n

insertado.sig = base.sig<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

base+ 1.ant = insertado<\/strong><\/span>.id<\/span><\/span><\/span><\/p>\n

insertado<\/span><\/strong>.ant = base + 1.ant<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

Para borrar un registro, haremos lo siguiente:<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

borrado – 1.sig = borrado.sig<\/span><\/span><\/span><\/p>\n

borrado + 1.ant = borrado.ant<\/span><\/span><\/span><\/p>\n

Y luego borramos el registro.<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

Para mover un registro para que quede despu\u00e9s de un registro \u201cbase\u201d, haremos lo siguiente:<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

base.sig = movido.id<\/span><\/span><\/span><\/p>\n

movido.sig = base.sig<\/span><\/span><\/span><\/p>\n

movido \u2013 1.sig = movido.sig<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

base + 1.ant = movido + 1.ant<\/span><\/span><\/span><\/p>\n

movido.ant = base.id<\/span><\/span><\/span><\/p>\n

movido + 1.ant = movido.ant<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Esta es una pregunta que me surgi\u00f3 al estar dise\u00f1ando una lista reordenable por el usuario. Es un tema b\u00e1sico, pero como me tard\u00e9 en recordar c\u00f3mo se hac\u00eda, anexo los pasos.   ID Texto Sig Ant 1 a 2 …<\/p>\n

C\u00f3mo ordenar una lista<\/span> Leer m\u00e1s \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-635","post","type-post","status-publish","format-standard","hentry","category-temas_varios"],"_links":{"self":[{"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/posts\/635","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/comments?post=635"}],"version-history":[{"count":0,"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/posts\/635\/revisions"}],"wp:attachment":[{"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/media?parent=635"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/categories?post=635"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/auval.com.mx\/blog\/wp-json\/wp\/v2\/tags?post=635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}