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Update or remove a parameter in a URL
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// update a parameter in a URL | |
// or removes it if value is null | |
// browser should support forEach() function or use a polyfill | |
var updateUrlParameter = function(url, key, value){ | |
var parser = document.createElement('a'); | |
parser.href = url; | |
var newUrl = parser.protocol+'//'+parser.host+parser.pathname; | |
// has parameters ? | |
if(parser.search && parser.search.indexOf('?') !== -1){ | |
// parameter already exists | |
if(parser.search.indexOf(key+'=') !== -1) { | |
// paramters to array | |
var params = parser.search.replace('?', ''); | |
params = params.split('&'); | |
params.forEach(function(param, i){ | |
if(param.indexOf(key+'=') !== -1) { | |
if(value !== null) params[i] = key+'='+value; | |
else delete params[i]; | |
} | |
}); | |
if(params.length > 0) newUrl += '?'+params.join('&'); | |
} | |
else if(value !== null) newUrl += parser.search+'&'+key+'='+value; // append new parameter | |
else newUrl += parser.search; // skip the value (remove) | |
} | |
else if(value !== null) newUrl += '?'+key+'='+value; // no parameters, create it | |
newUrl += parser.hash; | |
return newUrl; | |
} |
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