Trouble adding digits to my calculator display
Question
<html>
<head>
<title> Buttons</title>
<style type="text/css">
.intro{background-color:;}
.duction{background-color:blue;}
.function{background-color:grey;}
.equals{background-color:orange;}
</style>
</head>
<body>
<form name="calculator">
<input type="text" name="display" length="50" width="100">
<div>
<input type= "button" value="7" class="intro" id="7" onclick="one(7)"></button>
<input type= "button" value="8" class="intro" id="8" onclick="one(8)"></button>
<input type= "button" value="9" class="intro" id="9" onclick="one(9)"></button>
<input type= "button" value="+" class="intro" id="+" onclick="one(+)"></button>
<input type= "button" value="-" class="intro" id="-" onclick="one(-)"></button>
<div>
<input type= "button" value="4" class="intro" id="4" onclick="one(4)"></button>
<input type= "button" value="5" class="intro" id="5" onclick="one(5)"></button>
<input type= "button" value="6" class="intro" id="6" onclick="one(6)"></button>
<input type= "button" value="x" class="intro" id="x" onclick="one(*)"></button>
<input type= "button" value="/" class="intro" id="/" onclick="one(/)"></button>
<div>
<input type= "button" value="1" class="intro" id="1" onclick="one(1)"></button>
<input type= "button" value="2" class="intro" id="2" onclick="one(2)"></button>
<input type= "button" value="3" class="intro" id="3" onclick="one(3)"></button>
<input type= "button" value="=" class="intro" ></button>
<div>
<input type= "button" value="0" class="intro" id="0" onclick="one(0)"></button>
<input type= "button" value="." class="intro" id="." onclick="one(.)"></button>
<input type= "button" value="c" class="intro" onclick="clearDigit()"></button>
<script type="text/javascript" src="C:\Users\LS\Desktop\QBJS\button.js">
</script>
</body>
</html>
Javascript
function one(event)
{
clearTimeout(timer);
timer=setTimeout("AddDigit(object)",500);
object=event;
}
//Everytime I type a number into my display window it replaces the previous number instead of concatenating to it like a an actual calculator would. Also trying to figure out why I cant get my function symbols to appear in my display window....I suspect it has something to do with my setTimeout....
function AddDigit(x)
{
object=x;
if (eval(digit) == 0)
{digit = object;}
else
{digit = digit + object;}
document.calculator.display.value=object;
}
2 answers
solution1
0 2012-10-18 01:14:29
It isn't concatenating, it is not even adding. You cannot pass like that. The reason is that when you issue a callback with a string, it only will call the function. If you want to pass parameters then you need to create a closure and pass them in there.
Try this:
timer=setTimeout(function(){ AddDigit(object); },500);
More than likely what you meant to pass was the event:
timer=setTimeout(function(){ AddDigit(event); },500);
or
object = event;
timer=setTimeout(function(){ AddDigit(object); },500);
Also, in AddDigit, it is possible you wanted this instead:
document.calculator.display.value += object;
solution2
0 2012-10-18 01:17:51
You're doing,
document.calculator.display.value=object;
But the concatenated version is the "digit" variable.
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