JavaScript help running a basic function on button click

Question

Just trying to run a simple function when the button "calculate" is pressed. Function won't run at all when inputs are in a form, ultimately I want to be able to modify the other inputs when the calculate button is pressed. Any help at all please!

function calculate() {
  alert("called");
}

<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
</head>
<form name="form">
  Price:
  <input name="priceCAD" value="0">
  <br>
  <br>Markup:
  <input name="percentage" value="0">
  <br>
  <br>Fiat:
  <input name="fiat" value="0">
  <br>
  <br>BTC:
  <input name="btc" value="0" maxlength="11">
  <br>
  <br>

  <input type="button" onClick="calculate()" name="calculate" value="Caculate">
  <input type="button" name="clear" value="Clear" onClick="form.fiat.value=0, form.btc.value=0, form.markup.value=0">
</form>

Quynh Nguyen · Accepted Answer · 2016-08-02 01:08:14Z

1

Button HTML just need it:

<input type="button" onClick="calculate()" name="calculate" value="Caculate" >

And don't forget insert jquery lib in your <head>.

answered Aug 2, 2016 at 1:08

Quynh Nguyen

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6 Comments

bgmrk Over a year ago

I left document.calculate by accident in there. Where do I insert jquery lib? In all the examples i've been going off of online I have not seen that once.

Quynh Nguyen Over a year ago

Between <html> and <body>. Like this: <html lang="en-US"> <head> <script src="ajax.googleapis.com/ajax/libs/jquery/1.11.3/…> </head> <body>

bgmrk Over a year ago

Made the changes and still nothing. If I get rid of the form tags it calls on the function no problem. However with the 2 form tags in it doesn't get to the function.

Quynh Nguyen Over a year ago

Look like have conflict at function javascript name and input name.

bgmrk Over a year ago

Yes that was the issue thanks! Can't have a function name and element name the same.

|

Ayan · Accepted Answer · 2016-08-02 01:15:59Z

0

function calculate() {
  alert("called");
}

document.getElementsByName("calculate")[0].addEventListener("click", calculate);

<form name="form">
  Price:
  <input name="priceCAD" value="0">
  <br>
  <br>Markup:
  <input name="percentage" value="0">
  <br>
  <br>Fiat:
  <input name="fiat" value="0">
  <br>
  <br>BTC:
  <input name="btc" value="0" maxlength="11">
  <br>
  <br>

  <input type="button" name="calculate" value="Caculate">
  <input type="button" name="clear" value="Clear" onClick="form.fiat.value=0, form.btc.value=0, form.markup.value=0">
</form>

answered Aug 2, 2016 at 1:15

Ayan

2,3782 gold badges16 silver badges30 bronze badges

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