使用Internet Explorer 8的prompt（）

Question

I am having a hard time figuring out a solution for my problem. Here's a code snippet:

var ans = prompt("Mot de passe", '');
if (ans != '' && ans != null)
   __doPostBack('__Page', ans);
else
   window.location = "../Erreurs/NotAuthorized.aspx";

This code works really great with Internet Explorer 9. But my client is exclusively working with Internet Explorer 8 so I tested it with ieTester in IE8. But the problem is that the prompt doesn't show and it automatically redirect because the input had an empty string ('').

So how do I fix this to work with Internet Explorer 8?

Answer 1

IE has an setting in Internet Options to allow or deny prompt() .

_{(source: adamhaskell.net )}

By default in IE8, this setting is off. Consequently, calls to prompt() are ignored and "" is returned by them.

You shouldn't use prompt() anyway. Use a form.

Answer 2

It looks like a security thing specific to IE- 8 for sure, I don't have other versions to test. Calling prompt() produces a warning about a scripted window asking for information. I can click to allow and after refreshing the page, the prompt box appears as expected.

If you are going to insist on using prompt() , you will probably have to stipulate that security settings on the target machines are configured to allow it.

Answer 3

Microsoft developer website tells us that "prompt()" is deprecated and now normally blocked for security reasons: "By default, this method is blocked by the information bar in the Internet zone. This helps prevent malicious sites from initiating spoofing attacks. "

See http://msdn.microsoft.com/en-us/library/ms536673.aspx

Answer 4

From this report it looks like it's a known bug in IETester?

http://www.my-debugbar.com/forum/t294-Javascript-Alerts.html