Form button keeps showing results in new window
Question
Very new to html and javascript here. I get the following form up and it calculates correctly but the result shows up in a new page. I'd like it to stay in the same page. Not sure what I did wrong here. Also, is there any way to shorten the function? Seems like a lot of work to do a simple calculation. Any help would be great.
<html>
<head>
<title>Help!</help>
<script type="text/javascript">
function add(x,y){
var x = document.add1.add2.value;
var y = document.add1.add3.value;
var x = Number(x);
var y = Number(y);
var z = x+y;
return (z);
}
</script>
</head>
<body>
<h3>Help me stack overflow you're my only hope!</h3>
<form name="add1">
Input first number to add: <input type="number" name="add2">
2nd number: <input type="number" name="add3">
<input type="button" value="Result"
onclick = "document.write('The total is: ' + add() + '.');" />
</body>
</html>
2 answers
solution1
1 2014-11-04 20:31:34
Dont' use document.write to display data, it overwrites entire document. You don't want that. It's better to create new function which would render result into some other element:
<input type="button" value="Result" onclick="showResult('The total is: ' + add() + '.');" />
and the showResult function can be for example:
function showResult(result) {
document.getElementById('result').innerHTML = result;
}
HTML:
<div id="result"></div>
Demo: http://jsfiddle.net/7ujzn35c/
Here are also a couple of general improvements you can make your code:
move string manupulations to showResult completely:
<input type="button" value="Result" onclick="showResult()" />call
addfrom insideshowResultsonclick="showResult(this.form.add2.value, this.form.add3.value)"
solution2
0 2014-11-04 20:39:29
<title>Help!</help>
First of all, This should be <title> Help! </title> <title> Help! </title>
Secondly, document.write function actually starts writing the entire page anew.
You should either replace onclick = "document.write('The total is: ' + add() + '.');" with
onclick = "alert('The total is: ' + add() + '.');"
Better still, you could create a div element like so
<title> Help! </title>
<script>
.....
</script>
</header>
<body>
<div id = 'output'> </div> ...
then
`onclick = "document.getElementById("output").innerHTML = 'The total is: ' + add() + '.';"
And don't give up. Hope this helps you
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.