javascript - 如何使用 CustomJS 更新 Bokeh 源

Question

我在使用 Select 小部件和 CustomJS 尝试更新 Bokeh 源时遇到了一些麻烦。在这种情况下，CustomJS 是强制性要求，因此不能使用 def: 函数。下面的代码返回数据可视化，但它没有刷新，因为我猜，JS代码编写得不正确，我无法调试它(如果有人知道如何调试它，请这确实是我能得到的最佳答案)。

主要思想是根据在“选择”小部件上选择的值来过滤我的源。

有什么想法吗？

source = ColumnDataSource(data=dict(
    x=gx,
    y=gy,
    recty=recty,
    colors=colors,
    filter_info= filter_info))


select = Select(title="Option:", value="All", options=["All", "1", "2", "3", "4", "5", "6+"])

renderer_source = source

# Add the slider
code = """
    var value_filter_info = cb_obj.value;

    if value_assignments == 'All' { 
      new_source_data['x'] =  source.data['x'];
      new_source_data['y'] =  source.data['y'];
      new_source_data['recty'] =  source.data['recty'];
      new_source_data['colors'] =  source.data['colors'];
    } else {
      new_source_data['x'] =  source.data['x'][source.data['filter_info']==value_filter_info];
      new_source_data['y'] =  source.data['y'][source.data['filter_info']==value_filter_info];
      new_source_data['recty'] =  source.data['recty'][source.data['filter_info']==value_filter_info];
      new_source_data['colors'] =  source.data['colors'][source.data['filter_info']==value_filter_info];

    }

    renderer_source.data= new_source_data;
    renderer_source.change.emit();

"""

callback = CustomJS(args=dict(source=source, renderer_source=renderer_source), code=code)
select.js_on_change('value', callback)


p = figure(plot_width=1200, plot_height=400, x_range=(0,100), y_range=(0,1000))

p.rect(x='x', y='recty',  width=1, height=1, color='colors', source=renderer_source, line_color=None, fill_alpha=1, width_units="data", height_units="data")

plot_layout = column(select,p)
show(plot_layout)
output_notebook()

非常感谢!

Answer 1

因此，我找到了一种可以在美观、编程和视觉上进行改进的解决方案，但至少可以显示结果。

按照 @bigreddot 关于索引和覆盖的建议，我成功编写了当前的 CustomJS 代码:

code = """
    var render=renderer_source.data;
    var data=source.data;
    var data_assignment = data['assignments']; 
    var value_assignments = cb_obj.value; 


    var data_x=data['x'];
    var data_y=data['y'];
    var data_recty=data['recty'];
    var data_colors=data['colors'];

    var render_x=render['x'];
    var render_y=render['y'];
    var render_recty=render['recty'];
    var render_colors=render['colors'];

    var x = [];
    var y = [];
    var recty = [];
    var colors = [];

    render_x=[];
    render_y=[];
    render_recty=[];
    render_colors=[];


    for (var i=0;i<data_assignment.length; i++){

        if (value_assignments == 'All') { 
          x.push(data_x[i]);
          y.push(data_y[i]);
          recty.push(data_recty[i]);
          colors.push(data_colors[i]);
        } else if (data_assignment[i]==value_assignments) {
          x.push(data_x[i]);
          y.push(data_y[i]);
          recty.push(data_recty[i]);
          colors.push(data_colors[i]);

        }
    }

    renderer_source.data['x']=x;
    renderer_source.data['y']=y;
    renderer_source.data['recty']=recty;
    renderer_source.data['colors']=colors;

    renderer_source.change.emit();

"""