setUrlParam : function()

in deltaspike/modules/jsf/impl/src/main/resources/META-INF/resources/deltaspike/windowhandler.js [529:580]
33 lines of code
12 McCabe index (conditional complexity)

        setUrlParam : function(uri, parameterName, parameterValue) {
            var a = document.createElement('a');
            a.href = uri;

            // set empty string as value if not defined or empty
            if (!parameterValue || parameterValue.replace(/^\s+|\s+$/g, '').length === 0) {
                parameterValue = '';
            }

            // check if value is empty
            if (parameterValue.length === 0) {

                // both value and query string is empty (or doesn't contain the param), don't touch the url
                if (a.search.length === 0 || a.search.indexOf(parameterName + "=") === -1) {
                    return a.href;
                }
            }

            // query string is empty, just append our new parameter
            if (a.search.length === 0) {
                a.search = '?' + encodeURIComponent(parameterName) + "=" + encodeURIComponent(parameterValue);

                return a.href;
            }

            var oldParameters = a.search.substring(1).split('&');
            var newParameters = [];
            newParameters.push(parameterName + "=" + encodeURIComponent(parameterValue));

            // loop old parameters, remove empty ones and remove the parameter with the same name as the new one
            for (var i = 0; i < oldParameters.length; i++) {
                var oldParameterPair = oldParameters[i];

                if (oldParameterPair.length > 0) {
                    var oldParameterName = oldParameterPair.split('=')[0];
                    var oldParameterValue = oldParameterPair.split('=')[1];

                    // don't add empty parameters again
                    if (oldParameterValue && oldParameterValue.replace(/^\s+|\s+$/g, '').length > 0) {
                        // skip the the old parameter if it's the same as the new parameter
                        if (oldParameterName !== parameterName) {
                            newParameters.push(oldParameterName + "=" + oldParameterValue);
                        }
                    }
                }
            }

            // join new parameters
            a.search = '?' + newParameters.join('&');

            return a.href;
        },