How to replace html href link with button

Question

I have a HTML page that has Javascript in it (see below).

Within the HTML page there is a HTML code line that calls a Javascript function. This works exactly as it should and looks like this :

<a href="#" id="hour">hour</a> 

This code line calls from the last part of the below Javascript.

I wish to replace this code line with a button. How can I do this ?

Thank you

ps the Javascript is for use with dygraph and I did not write it. I know little about Javascript. I'm simply looking to replace the above single line of html with a button that does the same job or produce a button through other minimalistic change.

$(document).ready(function () {
    var r = [ ];
    var base_time = Date.parse("2014/03/05");
    var num = 24 * 0.25 * 365;

    for (var i = 0; i < num; i++) {
        r.push([
            new Date(base_time + i * 3600 * 1000),
            i + 50 * (i % 60),        // line
            i * (num - i) * 4.0 / num  // parabola
        ]);
    }

    var orig_range = [
        r[0][0].valueOf(),
        r[r.length - 1][0].valueOf()
    ];

    // NEW CODE INSERTED -   STARTS
    var one_month_previous = new Date();
    one_month_previous.setMonth(one_month_previous.getMonth() - 1);

    var one_week_previous = new Date();
    one_week_previous.setDate(one_week_previous.getDate()-7);

    var three_days_previous = new Date();
    three_days_previous.setDate(three_days_previous.getDate()-3);

    var one_days_previous = new Date();
    one_days_previous.setDate(one_days_previous.getDate()-1);

    var twelve_hours_previous = new Date();
    twelve_hours_previous.setHours(twelve_hours_previous.getHours() - 12);


    // NEW CODE INSERTED -   ENDS

    g = new Dygraph(
        document.getElementById("graphdiv3"),
        "show_csv.php",
        {

            // NEW CODE INSERTED -   STARTS
            //  dateWindow: [ Date.parse(one_month_previous) ,
            //            Date.parse(new Date()) ],

            dateWindow: [
                    Date.parse(one_week_previous),
                    Date.parse(new Date())
            ],

            //  dateWindow: [ Date.parse(three_days_previous) ,
            //            Date.parse(new Date()) ],

            //  dateWindow: [ Date.parse(one_days_previous) ,
            //            Date.parse(new Date()) ],

            //  dateWindow: [ Date.parse(twelve_hours_previous) ,
            //            Date.parse(new Date()) ],

            //  dateWindow: [ Date.parse("2014/03/01 12:00:00"),    
            //            Date.parse("2014/03/31 12:00:00") ],   

            // NEW CODE INSERTED -   ENDS

            title: 'Temperature(&deg;C) vs Time',
            rollPeriod: 1,
            showRoller: true,
            xlabel: 'Time',
            ylabel: 'Temperature (&deg;C)',
            legend: 'always',
            labelsKMB: 'true',
            labelsSeparateLines: 'true',
            colors: [
                "rgb(51,204,204)",
                "#00DD55",
                "rgb(255,100,100)",
                "rgba(50,50,200,0.4)"
            ]
        }
    );


    var desired_range = null;

    function approach_range() {
        if (!desired_range) return;
        // go halfway there
        var range = g.xAxisRange();

        if (Math.abs(desired_range[0] - range[0]) < 60 &&
            Math.abs(desired_range[1] - range[1]) < 60) {
                g.updateOptions({dateWindow: desired_range});
                // (do not set another timeout.)
        } else {
            var new_range;
            new_range = [
                0.5 * (desired_range[0] + range[0]),
                0.5 * (desired_range[1] + range[1])
            ];
            g.updateOptions({dateWindow: new_range});
            animate();
        }
    }

    function animate() {
        setTimeout(approach_range, 50);
    }

    var zoom = function(res) {
        var w = g.xAxisRange();
        desired_range = [ w[0], w[0] + res * 1000 ];
        animate();
    }

    var reset = function() {
        desired_range = orig_range;
        animate();
    }

    var pan = function(dir) {
        var w = g.xAxisRange();
        var scale = w[1] - w[0];
        var amount = scale * 0.25 * dir;
        desired_range = [
            w[0] + amount,
            w[1] + amount
        ];
        animate();
    }

    document.getElementById('hour').onclick = function() { zoom(3600); };
    document.getElementById('day').onclick = function() { zoom(86400); };
    document.getElementById('week').onclick = function() { zoom(604800); };
    document.getElementById('month').onclick = function() { zoom(30 * 86400); };
    document.getElementById('full').onclick = function() { reset(); };
    document.getElementById('left').onclick = function() { pan(-1); };
    document.getElementById('right').onclick = function() { pan(+1); };
});

Answer 1

Just style it your way now!=)

(IE optimized:) not sure if this is right tho.

<a href="#">
    <button id="hour">Hour</button>
</a>

Normal button

<button id="hour">Hour</button>

form method:

<form action="#">
    <input type="submit" value="submit">
</form>