A hack to display a HoverTool with local timezone timestamps when streaming data from server

On Apr 17, 2018, at 11:24, Meir Tseitlin <meir@imubit.com> wrote:

I was struggling hard to find a way to display time in local (browser) timezone - it's not currently supported by existing "formatters"-

Sharing it mostly for knowledge:

hover_ts_update_callback = CustomJS(args={'data_source':data_source}, code="""

    var el_arr = document.querySelectorAll('.hover_timestamp')

    el_arr.forEach(function(el) {
    
        if (cb_data.index['0d'].indices[0]) {
            var tick = data_source.data['time'][cb_data.index['0d'].indices[0]];
            var date = new Date(tick);
            var date_str = date.toLocaleDateString('en-EN', {
              hour: '2-digit',
              minute: '2-digit',
              second: '2-digit',
              hour12: false,
              month: 'short',
              day: 'numeric'
            });
        
            el.innerHTML = date_str;
        }
    })
""")

historical_hover_tool = HoverTool(
    tooltips=[('timestamp', '<div style="min-width: 100px;"><span class="hover_timestamp"></span></div>')] +
        [(var, '@%s{0.000}' % var) for var in signals],
    callback=hover_ts_update_callback,
)

fig = figure(
    tools = [historical_hover_tool],
)

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