*Created by: xjplke* I'm not sure why you call setOptionsFromProps in render. I found that if locale just has part param, render would failed. ``` <DateRangePicker startDate={this.state.startDate} endDate={this.state.endDate} ranges={this.state.ranges} opens='left' onEvent={this.handleEvent} locale={{ applyLabel: "ok", customRangeLabel: "user define"}}> </DateRangePicker> ``` It seems because the picker's locale attribute is replaced by locale which I define. ``` if ($this.$picker) { if (currentOptions) { keys.forEach(function (key) { $this.$picker.data('daterangepicker')[key] = currentOptions[key];//????? should it use object-assign when key's value is an object? }); } } ``` I removed the calling of setOptionsFromProps in render, it worked. I think the custom options just need transmit to daterangepicker once, which already done in componentDidMount。 Otherwise, use Object.assign to copy partial params.