MINDoSOFT commented on issue #10151: When setOption has dataZoom startValue or endValue, the label of the dataZoom slider does not show URL: https://github.com/apache/incubator-echarts/issues/10151#issuecomment-476503803 Hello everyone, @Ovilia I would like to keep the existing functionality as it is (show the label only on mouse hover). But as you can see in the **steps to reproduce** when you click the **click me** button, and then you try to click and drag the zoom slider's start or end you can see that the label is missing. In the screenshot below I am dragging the zoom slider (although my mouse pointer is not shown in the screenshot, sorry about that) and you can see that no labels are shown.  And as @mbury mentioned in the dataZoom.labelFormatter callback I confirm that I get `{ value: null, valueStr: "" }` Best regards, Sergios.
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