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Cross-browser Query Parameter Getter and Setter

Here’s a cross-browser compatible way of getting query parameter from a URL or setting query parameters and reloading the page. An alternate way would be to fetch something based on the parameters and then push the parameters to history.

function getQueryParameters() {
    var queryString = location.search.slice(1),
        params = {};

    queryString.replace(/([^=]*)=([^&]*)&*/g, function (_, key, value) {
        params[key] = value;
    });

    return params;
}

function setQueryParameters(params) {
    var query = [],
        key,
        value;

    for (key in params) {
        if (!params.hasOwnProperty(key)) {
            continue;
        }
        value = params[key];
        query.push(key + "=" + value);
    }

    location.search = query.join("&");
}

The example below will show you how to use the functions. Let’s assume you want a <select&gt; dropdown to trigger an event, in our case a page reload.

document.getElementById('selector').addEventListener('change', function () {
    var params = getQueryParameters(),
        selectedParameter = this.value;

    params.my_parameter = selectedParameter;
    setQueryParameters(params);
});

And that’s it! You’ve done it!

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