paperbuzzviz.js

/**
 * paperbuzzViz
 * See https://github.com/jalperin/paperbuzzviz for more details
 * Distributed under the MIT License. For full terms see the file docs/COPYING.
 * 
 * @brief Article level metrics visualization controller.
 */
function PaperbuzzViz(options) {
    // allow jQuery object to be passed in
    // in case a different version of jQuery is needed from the one globally defined
    $ = options.jQuery || $;

    // Init basic options
    var minItems_ = options.minItemsToShowGraph;
    var showTitle = options.showTitle;
    var showMini = options.showMini;

    var formatNumber_ = d3.format(",d");
    var parseDate = d3.timeParse('%Y-%m-%d');

    var graphheight = options.graphheight;
    var graphwidth = options.graphwidth;

    var data = options.paperbuzzStatsJson;
    var sources = data.altmetrics_sources;

    var published_date = options.published_date || false;
        
    if (published_date) {
        // accept published date provided
    // Will choose pub date based on online pub, print pub, or issued. If no month or day defaults to 01
    } else if (data.metadata['published-online']) {
        published_date = data.metadata["published-online"]["date-parts"][0];
    } else if (data.metadata['published-print']) {
        published_date = data.metadata["published-print"]["date-parts"][0];
    } else if (published_date = data.metadata["issued"]) {
        published_date = data.metadata["issued"]["date-parts"][0];
    } else {
        published_date = [1969, 1, 1]; // TODO: Better handling if no date is found
    }

    // Fill in the month and day with 1 if they are empty
    if (published_date.length == 1) {
        published_date.push(1)
    }
    if (published_date.length == 2) {
        published_date.push(1)
    }

    // extract publication date
    var pub_date = parseDate(published_date.join('-'));        
    

    var vizDiv;
    // Get the Div where the viz should go (default to one with ID "paperbuzz')
    if (options.vizDiv) {
        vizDiv = d3.select(options.vizDiv);
    } else {
        vizDiv = d3.select("#paperbuzz");
    }

    // look to make sure browser support SVG
    var hasSVG_ = document.implementation.hasFeature("http://www.w3.org/TR/SVG11/feature#BasicStructure", "1.1");

    // to track if any metrics have been found
    var metricsFound_;
    

     /**
     * Initialize the visualization.
     * NB: needs to be accessible from the outside for initialization
     */
    this.initViz = function() {

        vizDiv.select("#loading").remove();

        if (showTitle) {
            vizDiv.append("a")
                .attr('href', 'http://dx.doi.org/' + data.doi)
                .attr("class", "paperbuzz-title")
                .text(data.metadata.title);
        }

        vizDiv.append("br");
        
        if (sources.length > 0) {
            if (showMini || !hasSVG_) {
                addMiniViz(vizDiv, sources);
            } else {
                // loop through sources
                sources.forEach(function(source) {
                    // metricsFound_ = true;
                    addSourceRow(vizDiv, source);
                });
            }
           metricsFound_ = true;
        } else {
            vizDiv.append("p")
                .attr("class", "paperbuzz-muted")
                .text("No metrics found.");
        }
    };

    var addMiniViz = function(vizDiv, sources) {

        miniDiv = vizDiv.append('div')
                        .attr('id', 'paperbuzz-mini');

        miniDiv.append('span')
            .attr('class', 'paperbuzz-mini-total')

        var total = 0;
        sources.forEach(function(source) {
            miniDiv.append('div')
                .attr('class', 'paperbuzz-mini-source')
                .append('i')
                .attr('class', 'icon-' + source.source_id)
                .append('span')
                .attr('class', 'paperbuzz-mini-count')
                .text(source.events_count);
            total += source.events_count
        });

        miniDiv.selectAll('.paperbuzz-mini-total')
                .text(total);
    }

     /**
     * Build each article level statistics source.
     * @param {Object} canvas d3 element
     * @param {Array} sources Information about the source.
     * @param {Object} data Statistics.
     * @return {JQueryObject|boolean}
     */
    var addSourceRow = function(canvas, source) {
        var sourceRow, sourceTitle;

        // Build category html objects.
        sourceRow = canvas.append("div")
            .attr("class", "paperbuzz-source-row")
            .attr("style", "width: 100%; overflow: hidden;")
            .attr("id", "source-" + source.source_id);

        sourceTitle = sourceRow.append("h2")
            .attr("class", "paperbuzz-source-row-heading")
            .attr("id", "month-" + source)
            .text(source.source_id);

        addSource(source, sourceRow)

        return sourceRow;
    };


    /**
     * Add source information to the passed category row element.
     * @param {Object} source
     * @param {Object} category
     * @param {JQueryObject} $sourceRow
     * @return {JQueryObject}
     */
    var addSource = function(source, $sourceRow) {
        var $row, $countLabel, $count,
            total = source.events_count;

        $row = $sourceRow
            .append("div")
            .attr("class", "paperbuzz-row")
            .attr("style", "float: left")
            .attr("id", "paperbuzz-row-" + source.source_id);

        $countLabel = $row.append("div")
            .attr("class", "paperbuzz-count-label");
       
        $count = $countLabel.append("span");

        $count
            .attr("class", "paperbuzz-count")
            .attr("id", "paperbuzz-count-" + source.source_id)
            .html('<i class="icon-' + source.source_id + '"></i>' + ' ' + formatNumber_(total));
           

        $countLabel.append("br");
        $countLabel.append("span")
            .text(source.display_name);

        // Only add a chart if the browser supports SVG
        if (hasSVG_) {
            var level = false;

            // check what levels we can show
            var showDaily = false;
            var showMonthly = false;
            var showYearly = false;

            if (source.events_count_by_year) {
                level_data = source.events_count_by_year;
                var yearTotal = level_data.reduce(function(i, d) { return i + d.count; }, 0);
                var numYears = d3.timeYear.range(pub_date, new Date()).length;

                if (yearTotal >= minItems_.minEventsForYearly &&
                    numYears >= minItems_.minYearsForYearly) {
                    showYearly = true;
                    level = 'year';
                };
            }

            if (source.events_count_by_month) {
                level_data = source.events_count_by_month;
                var monthTotal = level_data.reduce(function(i, d) { return i + d.count; }, 0);
                var numMonths = d3.timeMonth.range(pub_date, new Date()).length;

                if (monthTotal >= minItems_.minEventsForMonthly &&
                    numMonths >= minItems_.minMonthsForMonthly) {
                    showMonthly = true;
                    level = 'month';
                };
            }


            if (source.events_count_by_day){
                level_data = source.events_count_by_day;
                //console.log(level_data);
                //function needs to return i + d.count only for the first 30 days
                var dayTotal = level_data
                    .filter(item => parseDate(item.date) < d3.timeDay.offset(pub_date, 29) && parseDate(item.date) >= pub_date)
                    .reduce(function(i, d) { return i + d.count; }, 0);
                //console.log(dayTotal);
                var numDays = d3.timeDay.range(pub_date, new Date()).length;
                //console.log(numDays);

                if (dayTotal >= minItems_.minEventsForDaily && numDays >= minItems_.minDaysForDaily) {
                    showDaily = true;
                    level = 'day';
                };
            }


            // The level and level_data should be set to the finest level
            // of granularity that we can show
            timeInterval = getTimeInterval(level);

            // check there is data for
            if (showDaily || showMonthly || showYearly) {
                var $chartDiv = $row.append("div")
                    .attr("style", "width: 70%; float:left;")
                    .attr("class", "paperbuzz-chart-area");

                var viz = getViz($chartDiv, source);
                loadData(viz, level);

                var update_controls = function(control) {
                    control.siblings('.paperbuzz-control').removeClass('active');
                    control.addClass('active');
                };

                var $levelControlsDiv = $chartDiv.append("div")
                    .attr("style", "width: " + (viz.margin.left + viz.width) + "px;")
                    .append("div")
                    .attr("style", "float:right;");

                if (showDaily) {
                    $levelControlsDiv.append("a")
                        .attr("href", "javascript:void(0)")
                        .classed("paperbuzz-control", true)
                        // .classed("disabled", !showDaily)
                        .classed("active", (level == 'day'))
                        .text("daily (first 30)")
                        .on("click", function() {
                            if (showDaily && !$(this).hasClass('active')) {
                                loadData(viz, 'day');
                                update_controls($(this));
                            }
                        }
                    );

                    $levelControlsDiv.append("text").text(" | ");
                }

                if (showMonthly) {
                    $levelControlsDiv.append("a")
                        .attr("href", "javascript:void(0)")
                        .classed("paperbuzz-control", true)
                        // .classed("disabled", !showMonthly || !showYearly)
                        .classed("active", (level == 'month'))
                        .text("monthly")
                        .on("click", function() { if (showMonthly && !$(this).hasClass('active')) {
                            loadData(viz, 'month');
                            update_controls($(this));
                        } });

                    if (showYearly) {
                        $levelControlsDiv.append("text")
                            .text(" | ");
                    }

                }

                if (showYearly) {
                    $levelControlsDiv.append("a")
                        .attr("href", "javascript:void(0)")
                        .classed("paperbuzz-control", true)
                        // .classed("disabled", !showYearly || !showMonthly)
                        .classed("active", (level == 'year'))
                        .text("yearly")
                        .on("click", function() {
                            if (showYearly && !$(this).hasClass('active')) {
                                loadData(viz, 'year');
                                update_controls($(this));
                            }
                        }
                    );
                }

                // add a clearer and styles to ensure graphs on their own line
                $row.insert("div", ":first-child")
                    .attr('style', 'clear:both');
                $row.attr('style', "width: 100%");
            };
        };

        return $row;
    };

    

    /**
     * Extract the date from the source
     * @param level (day|month|year)
     * @param d the datum
     * @return {Date}
     */
    var getDate = function(level, d) {
        var parseString = ''
        if (level == 'year') {
            parseString = '%Y';
        } else if (level == 'month') {
            parseString = '%Y-%m';
        } else if (level == 'day') {
            parseString = '%Y-%m-%d';
        }
        return d3.timeParse(parseString)(d.date);

    };


    /**
     * Format the date for display
     * @param level (day|month|year)
     * @param d the datum
     * @return {String}
     */
    var getFormattedDate = function(level, d) {
        switch (level) {
            case 'year':
                return d3.time.format("%Y")(getDate(level, d));
            case 'month':
                return d3.time.format("%b %y")(getDate(level, d));
            case 'day':
                return d3.time.format("%d %b %y")(getDate(level, d));
        }
    };


    /**
     * Extract the data from the source.
     * @param {string} level (day|month|year)
     * @param {Object} source
     * @return {Array} Metrics
     */
    var getData = function(level, source) {
        switch (level) {
            case 'year':
                return source.events_count_by_year;
            case 'month':
                return source.events_count_by_month;
            case 'day':
                return source.events_count_by_day;
        }
    };

    /**
     * Returns a d3 timeInterval for date operations.
     * @param {string} level (day|month|year
     * @return {Object} d3 time Interval
     */
    var getTimeInterval = function(level) {
        switch (level) {
            case 'year':
                return d3.timeYear;
            case 'month':
                return d3.timeMonth;
            case 'day':
                return d3.timeDay;
        }
    };


    /**
     * The basic general set up of the graph itself
     * @param {JQueryElement} chartDiv The div where the chart should go
     * @param {Object} sources
     * @return {Object}
     */
    var getViz = function(chartDiv, sources) {
        var viz = {};

        // size parameters
        viz.margin = {top: 20, right: 20, bottom: 50, left: 50};
        viz.width = graphwidth - viz.margin.left - viz.margin.right;
        viz.height = graphheight - viz.margin.top - viz.margin.bottom;


        // div where everything goes
        viz.chartDiv = chartDiv;

        // sources data
        viz.sources = sources;

        // just for record keeping
        viz.name = sources.source_id;

        viz.x = d3.scaleTime()
                .range([0,viz.width]);
                //.nice(d3.timeMonth);

        viz.y = d3.scaleLinear()
                .rangeRound([viz.height,0]);

        viz.z = d3.scaleOrdinal();
        viz.z.range(['main', 'alt']);

        // the chart
        viz.svg = viz.chartDiv.append("svg")
            .attr("width", viz.width + viz.margin.left + viz.margin.right)
            .attr("height", viz.height + viz.margin.top + viz.margin.bottom)
            .append("g")
            .attr("transform", "translate(" + viz.margin.left + "," + viz.margin.top + ")");


        // draw the bars g first so it ends up underneath the axes
        viz.bars = viz.svg.append("g");

        viz.svg.append("g")
            .attr("class", "x paperbuzz-axis")
            .attr("transform", "translate(0," + (viz.height - 1) + ")");

        viz.svg.append("g")
            .attr("class", "y paperbuzz-axis");

        
        viz.tip = d3.tip()
                .attr('class', 'paperbuzz-tooltip')
                .html(function(d) { return 'Count: ' + d.count + "<br>" + 'Date: ' + d.date; });
        viz.tip.offset([-10, 0]); // make room for the little triangle
        viz.svg.call(viz.tip);

        return viz;
    };


    /**
     * Takes in the basic set up of a graph and loads the data itself
     * @param {Object} viz AlmViz object
     * @param {string} level (day|month|year)
     */
    var loadData = function(viz, level) {
        var level_data = getData(level, viz.sources);
        var timeInterval = getTimeInterval(level);

        var end_date = new Date();
        // use only first 29 days if using day view
        // close out the year otherwise
        if (level == 'day') {
            end_date = timeInterval.offset(pub_date, 29);
        } else {
            end_date = d3.timeYear.ceil(end_date);
        }

        //
        // Domains for x and y
        //
        // a time x axis, between pub_date and end_date
        viz.x.domain([timeInterval.floor(pub_date), end_date]);

        // a linear axis from 0 to max value found
        viz.y.domain([0, d3.max(level_data, function(d) { return d.count; })]);

        //
        // Axis
        //
        var yAxis = d3.axisLeft(viz.y)
                .tickValues([d3.max(viz.y.domain())]);
        
        
        var ticks;
        if (level == 'day') {
            ticks = d3.timeDay.every(3);
        } else if (level == 'month') {
            ticks = d3.timeMonth.every(6);
        } else {
            ticks = d3.timeYear.every(1)
        }
        var xAxis = d3.axisBottom(viz.x)
                        .ticks(ticks);
    
        var xFormat;
        if (level == 'day') {
            xFormat = "%b %d '%y";
        } else if (level == 'month') {
            xFormat = "%b %Y";
        } else {
            xFormat = "%Y"
        }
        // The chart itself
        //

        // TODO: these transitions could use a little work
        var barWidth = Math.max((viz.width/(timeInterval.range(pub_date, end_date).length + 1)) - 2, 1);

        var bars = viz.bars.selectAll(".paperbuzz-bar")
            .data(level_data, function(d) { return getDate(level, d); });

        bars
            .enter().append("rect")
            .attr("class", function(d) { 
                var bartype = (level == 'day' ? d3.timeWeek(getDate(level, d)) : getDate(level, d).getFullYear());
                return "paperbuzz-bar " + viz.z(bartype); 
            })
            .attr("x", function(d) { return viz.x(getDate(level, d)) + 2; }) // padding of 2, 1 each 
            .attr("y", function(d) { return viz.y(d.count) } )
            .attr("width", barWidth)
            .attr("height", function(d) { return viz.height - viz.y(d.count); })
            .on("mouseover", viz.tip.show)
            .on("mouseout", viz.tip.hide);

        bars
            .exit()
            .remove();

        viz.svg
            .select(".x.paperbuzz-axis")
            .call((xAxis)
                .tickFormat(d3.timeFormat(xFormat)))
            .selectAll("text")	
                .style("text-anchor", "end")
                .attr("dx", "-.8em")
                .attr("dy", ".15em")
                .attr("transform", "rotate(-45)");


        viz.svg
            .transition().duration(1000)
            .select(".y.paperbuzz-axis")
            .call(yAxis);
    }

};