如何在打字时设置文本框格式
本文关键字：置文本 格式 | 更新日期: 2023-09-27 17:59:53
当用户在文本框中键入时，我希望它用小数来格式化自己。
例如，如果用户键入10000，我希望它在键入时显示为10,000。
开始吧。切换退格/删除使其特别具有挑战性。真有趣！：-）
我已经在rack.pub.上把这个添加到了我的在线脚本组合中
function toast(a,b){b||(b=2750);var c={message:a,timeout:b};snackbarContainer.MaterialSnackbar.showSnackbar(c)}var doc=document,textArea=doc.getElementById("area"),numArray=[],backArray=[],num="",numF="",regx="",thisChar="",lastChar="",str="",index=0;window.snackbarContainer=doc.querySelector("#toast"),textArea.addEventListener("keydown",function(){var a=event.keyCode;if(str=this.value,(8==a||46==a)&&(backArray=[],index=str.length-1,lastChar=str.charAt(index),!isNaN(lastChar)||","==lastChar))for(var b=str.length-1;b>=0;b--){if(" "==str.charAt(b))return;if(isNaN(str.charAt(b))&&","!=str.charAt(b))return;backArray.push(str.charAt(b))}if(32==a&&backArray[1]){var c=backArray.reverse().slice(0,-1).join(""),d=c.replace(/',/g,""),e=Number(d).toLocaleString().toString(),f=str.lastIndexOf(c);f>=0&&f+c.length>=str.length&&(str=str.substring(0,f)+e),this.value=str}}),textArea.addEventListener("keypress",function(){if(thisChar=this.value.slice(-1),isNaN(thisChar)){num=numArray.join(""),numArray=[],numF=Number(num).toLocaleString().toString(),regx=num+"(?!.*"+num+")",regx=new RegExp(regx);var a=this.value.replace(regx,numF);this.value=a}else{if(" "==thisChar){num=numArray.join(""),numArray=[],numF=Number(num).toLocaleString().toString(),regx=num+"(?!.*"+num+")",regx=new RegExp(regx);var a=this.value.replace(regx,numF);return void(this.value=a)}numArray.push(thisChar)}}); html body {
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JavaScript to automatically add commas to numbers in a text area
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Basically it auto formats numbers as you type in the text area. Give it a try.
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<script defer src="https://code.getmdl.io/1.2.0/material.min.js"></script>使用replace和regex，然后在keyup上排队。
$(selector).replace(/('d)(?=('d'd'd)+(?!'d))/g, "$1,")
//will replace with commas
事实证明，这个问题比我预期的更具挑战性（我本应该知道得更好）。这是我使用香草Javascript得到的。
您可以为TextBox:的onkeyup事件设置事件处理程序
<asp:TextBox ID="txtAutoFormat" runat="server" onkeyup="processKeyUp(this, event)" />
这是Javascript代码：
<script type="text/javascript">
function extractDigits(str) {
return str.replace(/'D/g, '');
};
function findDigitPosition(str, index) {
var pos = 0;
for (var i = 0; i < str.length; i++) {
if (/'d/.test(str[i])) {
pos += 1;
if (pos == index) {
return i + 1;
}
}
}
};
function isCharacterKey(keyCode) {
// Exclude arrow keys that move the caret
return !(35 <= keyCode && keyCode <= 40);
};
function processKeyUp(txt, e) {
if (isCharacterKey(e.keyCode)) {
var value = txt.value;
// Save the selected text range
var start = txt.selectionStart;
var end = txt.selectionEnd;
var startDigit = extractDigits(value.substring(0, start)).length;
var endDigit = extractDigits(value.substring(0, end)).length;
// Insert the thousand separators
txt.value = extractDigits(value).replace(/('d{1,3}|'G'd{3})(?=(?:'d{3})+(?!'d))/g, "$1,");
// Restore the adjusted selected text range
txt.setSelectionRange(findDigitPosition(txt.value, startDigit), findDigitPosition(txt.value, endDigit));
}
};
</script>
学分：
CMS的解决方案是使用javascript从Regex中的字符串中提取数字，只返回数字。
Alan Moore在How do I added thousand separator with reg ex？中插入千个分隔符的正则表达式？。
注意：Ron Royston使用toLocaleString的想法也很有趣。它可以提供一个更普遍的解决方案。你可以替换这行processKeyUp:
txt.value = extractDigits(value).replace(/('d{1,3}|'G'd{3})(?=(?:'d{3})+(?!'d))/g, "$1,");
具有以下内容：
txt.value = Number(extractNumber(value)).toLocaleString();
尝试输入掩码，下面是一个示例：http://digitalbush.com/projects/masked-input-plugin/
您可以使用jquery屏蔽框架
参考：
Jquery掩蔽
来源于git