How to save cursor position in textarea when focus is lost?

Question

React

When editing, you need to insert an element into the teatarea form with text by selecting it from another selected form (click on selected and certain text is inserted into the textarea).
The problem is that when I select an element to paste, the focus disappears from the textarea, the cursor position is lost, and the paste only occurs at the end of the text. (And I need to paste where the cursor was)

How can I make sure that the paste is at the last position? Pass textarea.selectionEnd? How exactly can it be used in a method?

addExpression(index, value){
let withCondition = this.state.step.text ? this.state.step.text : ' ';
withCondition = (with.Condition + value);
this.setState({step: {...this.state.step, text: withCondition}},  () => {
       this.saveChanges();
       this.props.changedModified(true);
})

Answer 1

Pass textarea.selectionEnd?

Well, yes .