JavaScript 只允许数字、逗号、点、退格
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JavaScript to allow only numbers, comma, dot, backspace
提问by vishnu reddy
i wrote a javascript function to allow only numbers, comma, dot like this
我写了一个 javascript 函数来只允许像这样的数字、逗号、点
function isNumber(evt) {
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode(key);
var regex = /^[0-9.,]+$/;
if (!regex.test(key)) {
theEvent.returnValue = false;
if (theEvent.preventDefault) theEvent.preventDefault();
}
}
but if i want to remove any number form text box.. backspace is not working. then i changed regex code as "var regex = /^[0-9.,BS]+$/;"
但如果我想删除任何数字形式的文本框..退格键不起作用。然后我将正则表达式代码更改为“ var regex = /^[0-9.,BS]+$/;”
still i am not able to use backspace in textbox.even i cant use left and right keys on textbox is i am doing wrong? can anyone help... thanks. (when I used "BS" in regex instead of backspace its allowing "B","S" Characters in textbox..)
我仍然无法在文本框中使用退格键。即使我不能在文本框中使用左右键也是我做错了吗？任何人都可以帮助...谢谢。（当我在正则表达式中使用“BS”而不是退格时，它允许文本框中的“B”、“S”字符......）
回答by anubhava
Try this code:
试试这个代码：
function isNumber(evt) {
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode(key);
if (key.length == 0) return;
var regex = /^[0-9.,\b]+$/;
if (!regex.test(key)) {
theEvent.returnValue = false;
if (theEvent.preventDefault) theEvent.preventDefault();
}
}
回答by Hemang Gandhi
Try this code, I modified it and worked for me to allow and comma, dot and digits only.
试试这个代码，我修改了它并对我来说有效，只允许和逗号、点和数字。
function isNumber(evt) {
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
var keyCode = key;
key = String.fromCharCode(key);
if (key.length == 0) return;
var regex = /^[0-9.,\b]+$/;
if(keyCode == 188 || keyCode == 190){
return;
}else{
if (!regex.test(key)) {
theEvent.returnValue = false;
if (theEvent.preventDefault) theEvent.preventDefault();
}
}
}
