Prompt window - OK/Cancel in Do While

[navyjax2]

My question is closely related to http://www.thescripts.com/forum/thread444945.html and was not answered there, so I figured I'd revive it since I think I have the same issue.

Here is my applicable code:

  do {
   var f=prompt('Would you like the output to be displayed in this page (1) or as a pop-up (2)','1');
    }
  while (f != "1" && f != "2" && f != "");
 
// Begin case statement to make the code do its stuff based on "f"

Basically I want the prompt to get the user to have to put in either a 1 or a 2 no matter what, unless they hit Cancel. That means if they erase my "1" I have in there by default and they leave the prompt blank and they hit OK, I want it to spit the prompt back at them. The code above works great for that except the Cancel will just make the box stay up. I know that it's because of my f != "" above (the element that checks to see if the box was left blank), but is there a way to distinguish between when f happens to be null from being left blank (f's value is actually "undefined") and when the Cancel button was pressed (when f's value is "null")? Is there actually a difference? Using f !="null" above does not work, either.

Thanks,
Tom

[epots9]

try this:

var f = "";
do {
f=prompt('Would you like the output to be displayed in this page (1) or as a pop-up (2)','1');
}
while (f != "1" || f != "2" || f == "");
 

i might have missed read your question, but does that do what you want?

good luck

[phvfl]

Hi Tom,

When cancel is pressed the returned value (f) is null. This can be seen by changing the code to:

do {
var f=prompt('Would you like the output to be displayed in this page (1) or as a pop-up (2)','1');
alert(f);
}
while (f != "1" && f != "2" && f != "");
 
// Begin case statement to make the code do its stuff based on "f"
 

The additional line simply alerts you to the value if f so that you can see what the output is. The code should work as you wish using:

do {
var f=prompt('Would you like the output to be displayed in this page (1) or as a pop-up (2)','1');
}
while (f != "1" && f != "2" && f != null);
 
// Begin case statement to make the code do its stuff based on "f"
 

The other effect is that the prompt is not removed when the content is deleted as previously.

[pbmods]

Heya, Tom. Welcome to TSDN!

Please use CODE tags when posting source code. See the REPLY GUIDELINES on the right side of the page next time you post.

[navyjax2]

epots9, not quite - the prompt never ends when you have "or" statements between it all. Thanks for trying, though.

Mods - sorry - forgot to look at that section...

But phvfl, you're awesome, thank you - your code worked great. I had posted an alert on "f" before and it told me what the values of it were and all, but I thought I had to have quotes on the "null" - guess I didn't! Was beating my head up against the wall on this for too long to see the obvious. Thanks again, all.

-Tom