React: How to occur an alert modal only when browser back












0















I have tried to occur an aler <Modal /> only when browser back. But currently, default alert shows and everytime when I leave from this website an alert occurs. How can I fix this?



constructor(props) {
super(props);

this.onUnload = this.onUnload.bind(this);
}

onUnload(event) {
console.log("alert");
event.returnValue = "alert";
}

componentDidMount() {
window.addEventListener("beforeunload", this.onUnload);
}

componentWillUnmount() {
window.removeEventListener("beforeunload", this.onUnload);
}









share|improve this question























  • Possible duplicate of Dialog box runs for 1 sec and disappears?

    – Just code
    Nov 15 '18 at 5:20
















0















I have tried to occur an aler <Modal /> only when browser back. But currently, default alert shows and everytime when I leave from this website an alert occurs. How can I fix this?



constructor(props) {
super(props);

this.onUnload = this.onUnload.bind(this);
}

onUnload(event) {
console.log("alert");
event.returnValue = "alert";
}

componentDidMount() {
window.addEventListener("beforeunload", this.onUnload);
}

componentWillUnmount() {
window.removeEventListener("beforeunload", this.onUnload);
}









share|improve this question























  • Possible duplicate of Dialog box runs for 1 sec and disappears?

    – Just code
    Nov 15 '18 at 5:20














0












0








0








I have tried to occur an aler <Modal /> only when browser back. But currently, default alert shows and everytime when I leave from this website an alert occurs. How can I fix this?



constructor(props) {
super(props);

this.onUnload = this.onUnload.bind(this);
}

onUnload(event) {
console.log("alert");
event.returnValue = "alert";
}

componentDidMount() {
window.addEventListener("beforeunload", this.onUnload);
}

componentWillUnmount() {
window.removeEventListener("beforeunload", this.onUnload);
}









share|improve this question














I have tried to occur an aler <Modal /> only when browser back. But currently, default alert shows and everytime when I leave from this website an alert occurs. How can I fix this?



constructor(props) {
super(props);

this.onUnload = this.onUnload.bind(this);
}

onUnload(event) {
console.log("alert");
event.returnValue = "alert";
}

componentDidMount() {
window.addEventListener("beforeunload", this.onUnload);
}

componentWillUnmount() {
window.removeEventListener("beforeunload", this.onUnload);
}






javascript reactjs






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asked Nov 15 '18 at 5:14









Shun YamadaShun Yamada

359




359













  • Possible duplicate of Dialog box runs for 1 sec and disappears?

    – Just code
    Nov 15 '18 at 5:20



















  • Possible duplicate of Dialog box runs for 1 sec and disappears?

    – Just code
    Nov 15 '18 at 5:20

















Possible duplicate of Dialog box runs for 1 sec and disappears?

– Just code
Nov 15 '18 at 5:20





Possible duplicate of Dialog box runs for 1 sec and disappears?

– Just code
Nov 15 '18 at 5:20












1 Answer
1






active

oldest

votes


















0














I don't use React but that would work with the code below.



history.pushState(null, null);
window.addEventListener('popstate', function(e) {
alert('BF')
});





share|improve this answer























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    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    0














    I don't use React but that would work with the code below.



    history.pushState(null, null);
    window.addEventListener('popstate', function(e) {
    alert('BF')
    });





    share|improve this answer




























      0














      I don't use React but that would work with the code below.



      history.pushState(null, null);
      window.addEventListener('popstate', function(e) {
      alert('BF')
      });





      share|improve this answer


























        0












        0








        0







        I don't use React but that would work with the code below.



        history.pushState(null, null);
        window.addEventListener('popstate', function(e) {
        alert('BF')
        });





        share|improve this answer













        I don't use React but that would work with the code below.



        history.pushState(null, null);
        window.addEventListener('popstate', function(e) {
        alert('BF')
        });






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Dec 19 '18 at 3:00









        Shun YamadaShun Yamada

        359




        359
































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