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顺便请问一下，目前有实现类似效果的方案吗？

没有 @smallyunet

@smallyunet, Do you want the whole data of a river to custom the tooltip?

@deqingli

Only the river name is needed, it can be used as a key to find all the data.
Of course, it would be better if there is all the data, but it is not necessary.

Sorry, I don't understand your problem, I wonder if the following code can meet your question:

// the raw data you input into echarts

var initialData = [['2015/11/08',10,'DQ'],['2015/11/09',15,'DQ'],['2015/11/10',35,'DQ'],
                      ['2015/11/08',35,'TY'],['2015/11/09',36,'TY'],['2015/11/10',37,'TY'],
                      ['2015/11/17',36,'SS'],['2015/11/18',33,'SS'],['2015/11/19',43,'SS']];

formatter: function (params) {
    var name = params[0].name;
    var riverName = [];
    for (var i = 0; i < initialData.length; i++) {
        if (initialData[i][2] === name) {
            riverName.push(initialData[i]);
        }
    }
    console.log(riverName)   // All the data of a river
}

Sorry, I didn't clearly describe the problem. As your example, the value of the parameter name will not change. I hope that the contents of the hover box can change as the mouse position changes.

My trouble is that the theme river map is a single axis, and the parameter param of the formatter function can only dynamically get the value of the axis (date).

In other words, the parameter value of the function formatter can only change with the lateral movement of the mouse, and does not change with the vertical movement of the mouse.

I hope that the content of the floating window in the image can be the data of SS at all times, not the data of all rivers in 11-04-2015 .

And with the vertical movement of the mouse, the contents of the floating box will display the data of the rivers such as DQ , TY . The content of the current hover box can only change with the date.

This may seem a bit difficult and should be. I just want to make a suggestion and communicate at any time.

@deqingli

@smallyunet Thank you for your suggestion and detailed message, I will follow up this issue.