javascript - Conventions for querystring parameters -

javascript - Conventions for querystring parameters -

when have url this:

http://server/site?firstname=jack&lastname=daniels

i understand in javascript query firstname should homecoming "jack".

but should query firstname homecoming in next cases:

http://server/site?lastname=daniels http://server/site?firstname&lastname=daniels http://server/site?firstname=&lastname=daniels

[edit] reply of comments: of above legal querystrings, question not how retrieve parameters how interpret them.

for record, parse querystrings next regular look covers cases:

/([^?=&;]+)(?:=([^&;]*))?/g

apparently there's a popular question on how retrieve querystring parameters, reply wrong (or @ to the lowest degree not addressing border cases).

[update] selection based on answers @bergi , @zzzzbov:

http://server/site?lastname=daniels => firstname: undefined http://server/site?firstname&lastname=daniels => firstname: true http://server/site?firstname=&lastname=daniels => firstname: "" http://server/site?firstname=jack&lastname=daniels => firstname: "jack"

a side effect had modify regex, above rules = sign needs captured:

/([^?=&;]+)(=[^&;]*)?/g

but should query return

that's decision, need? there several querystring-evaluating functions of different complexity. of them can deal repeated, nested, bracket-syntax values, others not. famous ones can found in how can query string values? , duplicate questions.

however, asked conventions:

http://server/site?lastname=daniels

the result should falsy represent absence of firstname. might take null or undefined.

http://server/site?firstname&lastname=daniels

this represents boolean parameter, returning true legitimate. yet i'm sure there libs ignore format.

http://server/site?firstname=&lastname=daniels

that's quite empty string "".

javascript html url query-string