如何使用 javascript 添加表单值?

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时间:2020-10-25 15:51:20  来源:igfitidea点击:

How can I ADD form values using javascript?

javascriptforms

提问by Hymanson5

this is the code i came up with but all it does is this 1+1=11 i need it to do 1+1=2.

这是我想出的代码,但它所做的只是这个 1+1=11 我需要它来做 1+1=2。

<head>
<script type="text/javascript">
function startCalc(){
  interval = setInterval("calc()",1);
}
function calc(){
  one = document.form1.quantity.value;
  two = document.form1.price.value;
  c = one + two 
  document.form1.total.value = (c);
}
function stopCalc(){
  clearInterval(interval);
}
</script>


</head>
<body>
<form name="form1">
Quantity: <input name="quantity" id="quantity" size="10">Price: <input name="price" id="price" size="10"><br>
Total: <input name="total" size="10" readonly=true><br>
<input onclick="startCalc();" onmouseout="stopCalc()" type="button" value="Submit">
</form>

</body>

of course this is a really simple form, but you get the idea please help me tell what i'm doing wrong here

当然,这是一个非常简单的表格,但是您明白了请帮我告诉我我在这里做错了什么

回答by Paul Schreiber

You need to use parseInt()to convert the string to an integer.

您需要使用parseInt()将字符串转换为整数。

c = parseInt(one, 10) + parseInt(two, 10)

回答by Gaurav

use this

用这个

c = parseInt(one,10) + parseInt(two, 10); 

回答by Chandu

You need to convert the price values to numeric.

您需要将价格值转换为数字。

use parseFloat for price since it can have decimal values.

使用 parseFloat 作为价格,因为它可以有十进制值。

use parseInt with the radix.

将 parseInt 与基数一起使用。

e,g:

例如:

function calc(){
  one = parseInt(document.form1.quantity.value, 10);
  two = parseFloat(document.form1.price.value);
  c = one + two 
  document.form1.total.value = (c);
}

回答by Mic

You can use the +to convert a string to a number (integer or float)

您可以使用+将字符串转换为数字(整数或浮点数)

c = +one + +two;

回答by Kareem

You can use this

你可以用这个

  one = document.form1.quantity.value/1;
  two = document.form1.price.value/1;