State Value not changing in react drop down

JavaScript
1

I have a drop down menu in react where the state changes if I select the second item in the menu but if a change the menu back to the first item the state does not update unless i choose the second item twice. I have tried placing the code in a useEffect with colorDrop in the dependency array but it still does not work correctly. Here is my code if anyone has any idea how to fix this issue.


currentArray = ["blue", "grey"]
 const [colorDrop, setColorDrop] = useState(currentArray[0])


 function Dropdown() {

        return (
            <div>
                <form>
                    <label>Color</label>
                    <select required onChange={(e) => setColorDrop(e.target.value)}>
                        {currentArray.map((item, iter) => {
                           
                           
                            return (
                                <option key={iter}>{item}</option>

                            )
                        })}
                    </select>

                </form>
            </div>
        )

    }
2

this “select” element is not a “controlled” component, make use of “value” attribute with help of a “useState” hook to keep track of “updated” value after any changes occur

happy coding :slight_smile:

3

I changed this to a separate function and if I console log e to get the event object the useChange does not fire if I choose grey then choose blue again. It seems like the above code is using the useState hook to set it to e.target value already.

4

I set a default option above the map of the array and now it works correctly.

 function Dropdown() {

        return (
            <div>
                <form>
                    <label>Color</label>
                    <select required  onChange={(e) => changeColor(e)}>
                    <option default value="">---</option>
                        {currentProduct.colorArray.map((item, iter) => {
                          
                            
                            return (
                                <option id={iter} key={iter}>{item.color}</option>

                            )
                        })}
                    </select>

                </form>
            </div>
        )

    }
5

That wasnt quite working i had to pass the state back into the value of select to get the dropdown to update correctly. In the past that wasnt necessary

6

This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.