My situation involves a parent web page where I open a new window using JavaScript. The new window is an ASP.NET server-side page that needs to save data in the database and return an ID after saving it. Now, the challenge is passing this ID from the child server page back to the parent's JavaScript.
I essentially require the child server code to: 1) Return the value to the JavaScript code of the parent page 2) Close itself
What would be the best approach to achieve this?
Declare a variable in the parent page:
let databaseID;
Once the database call is completed from the opened window, add this code inside the loaded event of the opened window (or ready event if using jQuery or another library):
window.opener.databaseID = <%= newID %>
// You can adapt this based on your framework's approach :-)
window.close();
You can also invoke a global function on the parent page utilizing the same method.
In the "parent" page:
function handleNewDatabaseID(databaseID) { alert("I received an ID! Here it is: " + databaseID); }
And in the opened window:
window.opener.handleNewDatabaseID(<%=newID%>);
In the event that you find yourself in the secondary window and your main window contains a variable named childResult:
window.opener.childResult = "insertYourIdHere";
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