ShowModalDialog returns Null in Google Chrome _ javascript tips

The return value of showModalDialog can be obtained in IE and Firefox, but Null is returned in Google Chrome. There is a good solution below, if you are interested, you can refer to the returned values of showModalDialog to obtain the returned values under IE and Firefox. However, Null is returned in Google's browser. The solution is described below.

Parent page:

The Code is as follows:

Function openwindows (){
Var obj = new Object ();

// Open the modal subform and obtain the return value
Var retval = window. showModalDialog ("ordervideo. jsp? RderIds = "+" 0030, ", obj," dialogWidth = 500px; dialogHeight = 500px ");

// For chrome
If (retval = undefined ){
Retval = window. returnValue;
}
Alert (retval );
}

Subpage:

The Code is as follows:

Function onload (){

// For chrome
If (window. opener! = Undefined) {// The window. opener value is not empty in Google's browser. It is undefined in IE/Firefox, so that it can be determined whether it is Google's browser.
Window. opener. returnValue = flag; // window used to assign a value to the return value in Google's browser. opener. close (); // you must close it once. Otherwise, run the following window. close () cannot close the pop-up window, because the pop-up window in Google browser is a new window
}

Else {
Window. returnValue = flag; // This assignment method is compatible with IE/Firefox, but does not support Google browsers.
}
Window. close ();

}