Alert dialog from was blocked

问题:

Dart doesn't show the alert dialog when I use a webview and show this error:

: An alert dialog was blocked. (extensions::webViewEvents:225)

: A confirm dialog was blocked. (extensions::webViewEvents:225)

Does anyone know how to bypass the problem or how to catch the error?

Thanks.

Sorry for my bad English.

Edit

The code used:

Element webview= querySelector("#webview");
Map<String,String> map=new Map();
map["src"]=urlWebView;
webview.attributes.addAll(map);
webview.style.visibility="visible";

DartEditor version= STABLE build 45396

The version number of the SDK= 1.10.0

The webview loads a page that works on a js not created by me.

The error occurs when using this:

alert("***")

回答1:

A webview cannot show those by default.

You need to catch the dialog event, show your own UI for it (remember, Apps can't use alert and friends, so a <dialog> is a good option) and then pass the response back with DialogController

回答2:

more Clarification on @Xan Answer:

you need to listen to the dialog event from the webview ,Please read the comments in the code to understand better , again, I am using nwjs, so you can implement similar version in your language:

    //lets listen to alert dom and enable it 
    webview.addEventListener('dialog',function(e){

   //message type 
   messageType = e.messageType;

   messageText = e.messageText;

   DialogController = e.dialog;


   //lets checki if alert
   if(messageType == 'alert'){
     window.alert(messageText);
   }//emd if 

   //if confirm
   else if(messageType == 'confirm'){

    //confirm
    var confirm =  window.confirm(messageText);

    //get confirm bool and send to controller
    if(confirm == true){

       //if true send okay to browser
       DialogController.ok();
    }else{

      //send cancel with to send false false
      DialogController.cancel();
    }//end if

   }//end if confirm

  //lastly if its prompt 
  else if(messageType == 'prompt'){

     //get user Input 
     promptInput = window.prompt(messageText);

     //if null , then means the user clicked cancel 
     if(promptInput == null){

          //tell browser to cancel 
          DialogController.cancel();
     }else{
         //feed browser with input data 
         DialogController.ok(promptInput);
     }
  }//end if prompt

});//end dialog test