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How to update javascript variable value in html without a page refresh - Stack Overflow

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I am collecting a text area value(number in decimal ) using its id to a javascript variable, adding another variable value (number in decimal), and displaying the result in same html page

text area code:

<div class="input-resp"><span><input  class="textbox" id="num" name="count" type="text" size="5" maxlength="3"  value="" /></span></div>

passing value to var and adding it to another var

var a = document.getElementById('num').value;
var b = 1000;
var c = parseFloat(a) + parseFloat(b); 

passing var c to div id test

document.getElementById("test").innerHTML = c;

html for test id

<div id="test"></div>

But here, whenever I am updating the text area with new number, the final output is not updating instantly.I have refresh the page manually to get new value. Is there anyway I update the value without a page refresh ?

I am collecting a text area value(number in decimal ) using its id to a javascript variable, adding another variable value (number in decimal), and displaying the result in same html page

text area code:

<div class="input-resp"><span><input  class="textbox" id="num" name="count" type="text" size="5" maxlength="3"  value="" /></span></div>

passing value to var and adding it to another var

var a = document.getElementById('num').value;
var b = 1000;
var c = parseFloat(a) + parseFloat(b); 

passing var c to div id test

document.getElementById("test").innerHTML = c;

html for test id

<div id="test"></div>

But here, whenever I am updating the text area with new number, the final output is not updating instantly.I have refresh the page manually to get new value. Is there anyway I update the value without a page refresh ?

Share Improve this question edited Jul 27, 2013 at 17:20 putvande 15.2k3 gold badges36 silver badges51 bronze badges asked Jul 27, 2013 at 17:03 acracr 1,74611 gold badges49 silver badges83 bronze badges 2
  • Where is your jQuery and where did you define the variable data? And further more.. how are you doing this? With a click event? – putvande Commented Jul 27, 2013 at 17:05
  • @putvande : 'data' was a typo.variables are a,b and c.there is no click,iwould like to update the value whenever I type in textarea – acr Commented Jul 27, 2013 at 17:10
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1 Answer 1

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If it's going to update whenever you type into the input, you need an event handler:

document.getElementById('num').onkeyup = function() {
    var a = 1000 + parseFloat(this.value);
    document.getElementById("test").innerHTML = a || 0;
}

FIDDLE

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