User:Mike Dillon/Scripts/params.js: Difference between revisions

Revision as of 22:17, 6 January 2007

Latest revision as of 02:48, 20 March 2007

(2 intermediate revisions by the same user not shown)

Line 1:

/* <pre><nowiki> */

// Getfunction allgetParameterMap(url): Parses a URL parametersand fromextracts the query string parameters;

// if no URL is provided, uses the current URL. Caches parsed parameters between invocations.

var getParameterMap = (function () {

// URL parameters cache: key=url, value=paramMap

var params = {};

ifvar (___location.search)urlParamMaps = {};

// Trim the initial "?" and split on "&"

var kvs = ___location.search.replace(/^\?/, "").split("&");

for (var i in kvs) {

var kv = kvs[i].split("=", 2);

return function (url) { return params };

var key = kv[0];

// If no URL varis valuepassed =in, unescape(kv[1]);use the current page's URL

if (!params[key]url) {

url = ___location.href;

}

// If the parameters for this URL have already been parsed, return them

if (!params[key]) {

if params(urlParamMaps[keyurl]) =return urlParamMaps[url];

}

// Set up a params[key].push(value);new map for the parameters to be parsed

var paramsparamMap = {};

// Split the URL from the query string

var search = url.split("?", 2)[1];

if (search) {

// Split query string on "&"

var kvs = ___location.search.replace(/^\?/, "").split("&");

for (var i in kvs) {

// Split each key-value pair on the equals sign

var kv = kvs[i].split("=", 2);

var key = kv[0];

var value = decodeURIComponent(kv[1]);

// On the first occurence of a key, seed an empty array into paramMap

if (!paramMap[key]) {

paramMap[key] = [];

}

// Push the new value onto the value list for the key in paramMap

paramMap[key].push(value);

}

}

}

// Cache the paramMap to avoid parsing for all parameter requests

return function () { return params };

urlParamMaps[url] = paramMap;

return paramMap;

};

})();

// function getParameterValues(key, url): {Extracts the list of values for a particular key

// from the given URL; if no URL is provided, uses the current URL.

return getParameterMap()[key];

// Returns null if the parameter was not in the URL.

var values =function getParameterValues(key, url); {

return getParameterMap(url)[key];

}

// function getParameterValues(key, url): Extracts the values for a particular key

function getParameter(key) {

// from the given URL; if no URL is provided, uses the current URL.

var values = getParameterValues(key);

// If there is more than one value for the given key, the first value is returned.

// Returns null if the parameter was not in the URL.

function getParameter(key, url) {

var values = getParameterValues(key, url);

return values ? values[0] : null;

}

// function getParameterNames(url): Extracts the list of parameter {names

// from the given URL; if no URL is provided, uses the current URL.

function getParameterNames(url) {

var names = [];

for (var n in getParameterMap(url)) {

names.push(n);

}