在 jquery 中检查值是 float 还是 int
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Check a value is float or int in jquery
提问by Shiva Krishna Bavandla
I have the following html field, for which i need to check whether the input value is float or int,
我有以下 html 字段，我需要检查输入值是 float 还是 int，
<p class="check_int_float" name="float_int" type="text"></p>
$(document).ready(function(){
$('.check_int_float').focusout(function(){
var value = this.value
if (value is float or value is int)
{
// do something
}
else
{
alert('Value must be float or int');
}
});
});
So how to check whether a value is float or int in jquery.
那么如何在jquery中检查一个值是float还是int。
I need to find/check both cases, whether it is a float, or int, because later if the value was floati will use it for some purpose and similarly for int.
我需要查找/检查这两种情况，无论它是浮点数还是整数，因为稍后如果值是，float我将出于某种目的使用它，对于int.
回答by Janith Chinthana
use typeofto check the type, then value % 1 === 0to identify the int as bellow,
用于typeof检查类型，然后value % 1 === 0将 int 识别为波纹管，
if(typeof value === 'number'){
if(value % 1 === 0){
// int
} else{
// float
}
} else{
// not a number
}
回答by Mahmoude Elghandour
You can use a regular expression
您可以使用正则表达式
var float= /^\s*(\+|-)?((\d+(\.\d+)?)|(\.\d+))\s*$/;
var a = $(".check_int_float").val();
if (float.test(a)) {
// do something
}
//if it's NOT valid
else {
alert('Value must be float or int');
}
回答by reto
You can use a regular expression to determine if the input is satisfying:
您可以使用正则表达式来确定输入是否令人满意：
// Checks that an input string is a decimal number, with an optional +/- sign character.
var isDecimal_re = /^\s*(\+|-)?((\d+(\.\d+)?)|(\.\d+))\s*$/;
function isDecimal (s) {
return String(s).search (isDecimal_re) != -1
}
Keep in mind that the value from the input field is still a string and not a numbertype yet.
请记住，输入字段中的值仍然是字符串而不是number类型。
回答by Rahul Tripathi
I think the best idea would be to check like this ie, to check the remainder when dividing by 1:
我认为最好的办法是像这样检查，即在除以 1 时检查余数：
function isInt(value) {
return typeof value === 'Num' && parseFloat(value) == parseInt(value, 10) && !isNaN(value);
}
