JavaScript - 仅在范围内验证数字 [英] JavaScript - validate numeric only and within range

问题描述

我有一个包含许多字段的asp表单。在提交时，我想检查，使用javascript选择了一个复选框，并且在给定范围内的金额字段仅包含数字。我很难让它一次性检查所有三个 - 在mometn我有以下内容：

I have an asp form which has a number of fields. On submit I want to check, using javascript that a tickbox has been selected and that an 'amount' field in within a given range AND has numbers only. I'm struggling to get it to check all three in one go - at the mometn i have the following:

<script type="text/javascript">
function validateForm()
{
var x=document.forms["myForm"]["Amount"].value;
if (x<5 || x >250)
  {
  alert("Please complete all required fields - Amount you wish to save");
  return false;
  }

else if ( myForm.agreesubmit.checked == false )
  {
  alert ( "You Must Agree To The Terms and Conditions" );
  return false;
  } 

}
</script>

目前这是两个单独检查勾选框选择和范围。

At the moment this is two seperate checks for tick box select and range.

任何想法都赞赏。

推荐答案

创建一个可以执行此操作的功能：

Create a function that can do this:

function validate(str, chk, min, max) {
  n = parseFloat(str);
  return (chk && !isNaN(n) && n >= min && n <= max);
}

然后如下调用：

function validateForm()
{
  if(!validate(document.forms["myForm"]["Amount"].value, 
     document.forms["myForm"]["agreesubmit"].checked, 5, 250)) {
    alert("Please complete all required fields - Amount you wish to save");
    return false;
  }
}

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