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How to use prompt box to input a value in JavaScript



269 views
asked Jul 21, 2015 by avibootz
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2 Answers

0 votes 
var rv = prompt("Please enter a color");

if (rv != null)
    if (rv == "")
        document.write("You didn't enter a color, try again")
    else
        document.write(rv);
else 
    document.write("You pressed on Cancel")

/*
run:
 
 blue (I write "blue" in prompt box)
   
*/

 



answered Jul 21, 2015 by avibootz
0 votes 
var rv = prompt("Please enter a color", "blue"); // "blue" is the default value

if (rv != null)
    if (rv == "")
        document.write("You didn't enter a color, try again")
    else
        document.write(rv);
else 
    document.write("You pressed on Cancel")

/*
run:
 
You pressed on Cancel (I clicked on "Cancel" button)
   
*/

 



answered Jul 21, 2015 by avibootz

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