Trying to get the result of javascript function using innerHTML
Question
I have a simple program that takes in an input and then should show that input multiplied up to 100. I am new to this, but have tried to get it to work before posting here. I have the link to the program that I am referring to.
I want the result to be shown, but I cannot figure out why it is not showing.
You can see what I have below. I think I do not have the html and javascript hooked up properly.
Here is my html:
<body>
<input type="number" id="NumToBMultiplied" class="value" placeholder="Enter an integer" />
<input type='submit' id='RunProg' class='button' />
<p> id='result'</p>
</body>
Here is my Javascript:
h = document.getElementByID('NumToBMultiplied');
var result = document.getElementbyID('RunProg').addEventListener('click', function () {
for (i = 0; i < 100; i++)
return i * h;
}
});
document.getElementByID('result').innerHTML = result;
http://jsbin.com/wayejequxu/1/edit?html,js,output
Any help is appreciated!
4 answers
solution1
2 ACCPTED 2015-04-19 18:52:09
From how I understand your code, you are wanting to multiply the input 100 times, then output that into a HTML tag. The result in your example is not being added to the result paragraph as it isn't in the loop.
HTML
This is changed only slightly. Notice the onClick="solve()" to the button instead of adding an event listener.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<input type="number" id="NumToBMultiplied" class="value" placeholder="Enter an integer"/>
<input type="submit" id="RunProg" onClick="solve()" class="button"/>
<p id="result"> </p>
</body>
</html>
Javascript
I've added a line break after each result of the for loop so the result is easier to read. And the output is cleared before a new solve() is run.
var output = document.getElementById("result");
function solve() {
var input = document.getElementById("NumToBMultiplied").value;
output.innerHTML = "";
for(i=0; i < 100; i++) {
output.innerHTML += i * input + "<br/>";
}
}
Result here: http://jsbin.com/foduyofewi/1/
solution2
1 2015-04-19 18:39:45
You need to store your result in variable inside a callback and set innerHTML also in callback:
document.getElementById('RunProg').addEventListener("click", function() {
var result = 1;
var input = +h.value;
for (var i = 1; i < 100; i++) {
result *= i * input;
}
document.getElementById("result").innerHTML = result;
});
solution3
0 2015-04-19 19:15:19
Just some modification to your code to remove some of the typos and errors. I'm not sure you can return the result like how you have done it, a more traditional approach is shown below.
Full code
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<input type="number" id="NumToBMultiplied" class="value" placeholder="Enter an integer" />
<input type='submit' id='RunProg' class='button' />
<p id='result'> </p>
</body>
<script>
h = document.getElementById('NumToBMultiplied').value;
document.getElementById('RunProg').addEventListener('click', function () {
for (i = 0; i < 100; i++){
var result = h*i;
}
document.getElementById('result').innerHTML = result;
});
</script>
</html>
solution4
-1 2015-04-19 18:45:49
Pure Javascript version:
function multiply(x) { var result = document.getElementById('result'); result.innerHTML = x.value * 100; }
<input type="number" id="NumToBMultiplied" class="value" onchange="multiply(this)" placeholder="Enter an integer"/> <p id="result"></p>
This is the jQuery version:
$(document).ready(function() { $('#NumToBMultiplied').on('change',function(){ $('#result').text($(this).val()*100); }); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="number" id="NumToBMultiplied" class="value" placeholder="Enter an integer"/> <p id="result"></p>
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