有一个快速的方法来设置HTML文本输入(<input type=text />)，只允许数字击键(加上'.')?
当前回答
这里是一个非常简短的解决方案，不使用已弃用的keyCode或，不阻塞任何非输入键，并使用纯javascript。(在Chromium 70.0.3533, Firefox 62.0和Edge 42.17134.1.0中测试)
HTML:
<input type="text" onkeypress="validate(event)">
JS:
function validate(ev) {
if (!ev) {
ev = window.event;
}
if (!ev.ctrlKey && ev.key.length === 1 && (isNaN(+ev.key) || ev.key === " ")) {
return ev.preventDefault();
}
}
其他回答
JavaScript
你可以用下面的setInputFilter函数过滤text <input>的输入值(支持复制+粘贴，拖放，键盘快捷键，上下文菜单操作，不可输入键，插入号位置，不同的键盘布局，有效性错误消息，以及ie9以来的所有浏览器):
// Restricts input for the given textbox to the given inputFilter function.
function setInputFilter(textbox, inputFilter, errMsg) {
[ "input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop", "focusout" ].forEach(function(event) {
textbox.addEventListener(event, function(e) {
if (inputFilter(this.value)) {
// Accepted value.
if ([ "keydown", "mousedown", "focusout" ].indexOf(e.type) >= 0){
this.classList.remove("input-error");
this.setCustomValidity("");
}
this.oldValue = this.value;
this.oldSelectionStart = this.selectionStart;
this.oldSelectionEnd = this.selectionEnd;
}
else if (this.hasOwnProperty("oldValue")) {
// Rejected value: restore the previous one.
this.classList.add("input-error");
this.setCustomValidity(errMsg);
this.reportValidity();
this.value = this.oldValue;
this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd);
}
else {
// Rejected value: nothing to restore.
this.value = "";
}
});
});
}
你现在可以使用setInputFilter函数来安装一个输入过滤器:
setInputFilter(document.getElementById("myTextBox"), function(value) {
return /^\d*\.?\d*$/.test(value); // Allow digits and '.' only, using a RegExp.
}, "Only digits and '.' are allowed");
对输入错误类应用您首选的样式。这里有一个建议:
.input-error{
outline: 1px solid red;
}
请注意，您仍然必须进行服务器端验证!
另一个警告是，这将破坏撤销堆栈，因为它设置了这个。直接价值。 这意味着CtrlZ不能在输入无效字符后撤销输入。
Demo
查看JSFiddle演示以获得更多输入过滤器示例或运行下面的堆栈代码片段:
// Restricts input for the given textbox to the given inputFilter. function setInputFilter(textbox, inputFilter, errMsg) { [ "input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop", "focusout" ].forEach(function(event) { textbox.addEventListener(event, function(e) { if (inputFilter(this.value)) { // Accepted value. if ([ "keydown", "mousedown", "focusout" ].indexOf(e.type) >= 0) { this.classList.remove("input-error"); this.setCustomValidity(""); } this.oldValue = this.value; this.oldSelectionStart = this.selectionStart; this.oldSelectionEnd = this.selectionEnd; } else if (this.hasOwnProperty("oldValue")) { // Rejected value: restore the previous one. this.classList.add("input-error"); this.setCustomValidity(errMsg); this.reportValidity(); this.value = this.oldValue; this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd); } else { // Rejected value: nothing to restore. this.value = ""; } }); }); } // Install input filters. setInputFilter(document.getElementById("intTextBox"), function(value) { return /^-?\d*$/.test(value); }, "Must be an integer"); setInputFilter(document.getElementById("uintTextBox"), function(value) { return /^\d*$/.test(value); }, "Must be an unsigned integer"); setInputFilter(document.getElementById("intLimitTextBox"), function(value) { return /^\d*$/.test(value) && (value === "" || parseInt(value) <= 500); }, "Must be between 0 and 500"); setInputFilter(document.getElementById("floatTextBox"), function(value) { return /^-?\d*[.,]?\d*$/.test(value); }, "Must be a floating (real) number"); setInputFilter(document.getElementById("currencyTextBox"), function(value) { return /^-?\d*[.,]?\d{0,2}$/.test(value); }, "Must be a currency value"); setInputFilter(document.getElementById("latinTextBox"), function(value) { return /^[a-z]*$/i.test(value); }, "Must use alphabetic latin characters"); setInputFilter(document.getElementById("hexTextBox"), function(value) { return /^[0-9a-f]*$/i.test(value); }, "Must use hexadecimal characters"); .input-error { outline: 1px solid red; } <h2>JavaScript input filter showcase</h2> <p>Supports Copy+Paste, Drag+Drop, keyboard shortcuts, context menu operations, non-typeable keys, the caret position, different keyboard layouts, and <a href="https://caniuse.com/#feat=input-event" target="_blank">all browsers since IE 9</a>.</p> <p>There is also a <a href="https://jsfiddle.net/emkey08/tvx5e7q3" target="_blank">jQuery version</a> of this.</p> <table> <tr> <td>Integer</td> <td><input id="intTextBox"></td> </tr> <tr> <td>Integer >= 0</td> <td><input id="uintTextBox"></td> </tr> <tr> <td>Integer >= 0 and <= 500</td> <td><input id="intLimitTextBox"></td> </tr> <tr> <td>Float (use . or , as decimal separator)</td> <td><input id="floatTextBox"></td> </tr> <tr> <td>Currency (at most two decimal places)</td> <td><input id="currencyTextBox"></td> </tr> <tr> <td>A-Z only</td> <td><input id="latinTextBox"></td> </tr> <tr> <td>Hexadecimal</td> <td><input id="hexTextBox"></td> </tr> </table>
打印稿
下面是它的TypeScript版本。
function setInputFilter(textbox: Element, inputFilter: (value: string) => boolean, errMsg: string): void {
["input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop", "focusout" ].forEach(function(event) {
textbox.addEventListener(event, function(this: (HTMLInputElement | HTMLTextAreaElement) & { oldValue: string; oldSelectionStart: number | null, oldSelectionEnd: number | null }) {
if (inputFilter(this.value)) {
this.oldValue = this.value;
this.oldSelectionStart = this.selectionStart;
this.oldSelectionEnd = this.selectionEnd;
}
else if (Object.prototype.hasOwnProperty.call(this, "oldValue")) {
this.value = this.oldValue;
if (this.oldSelectionStart !== null &&
this.oldSelectionEnd !== null) {
this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd);
}
}
else {
this.value = "";
}
});
});
}
jQuery
还有一个jQuery版本。请看这个答案。
HTML5
HTML5有一个原生的解决方案<input type="number">(参见规范和文档)。文档中有这个输入类型的工作演示。
Instead of reading the value property, read the valueAsNumber property of the input to get the typed value as a number rather than a string. Usage inside a <form> is recommended because validation is made easier this way; for example, pressing Enter will automatically show an error message if the value is invalid. You can use the checkValidity method or the requestSubmit method on the entire form in order to explicitly check the validity. Note that you might need to use the required attribute in order to disallow an empty input. You can use the checkValidity method or the validity property on the input element itself in order to explicitly check the validity. You can use reportValidity to show an error message and use setCustomValidity to set your own message.
这种方法从根本上具有不同的用户体验:允许输入无效字符，并且单独执行验证。 这样做的好处是撤销堆栈(CtrlZ)不会中断。 注意，无论您选择哪种方法，都必须执行服务器端验证。
但请注意，浏览器支持不同:
大多数浏览器只在提交表单时验证输入，而在输入时不验证。 大多数移动浏览器不支持step、min和max属性。 Chrome(版本71.0.3578.98)仍然允许用户在字段中输入字符e和e。另请参阅问答为什么HTML输入type="number"允许在字段中输入字母e ? Firefox(版本64.0)和Edge (EdgeHTML版本17.17134)仍然允许用户在字段中输入任何文本。
Demo
document.querySelector("form").addEventListener("submit", (event) => { event.preventDefault(); console.log(`Submit! Number is ${event.target.elements.number.valueAsNumber}, integer is ${event.target.elements.integer.valueAsNumber}, form data is ${JSON.stringify(Object.fromEntries(new FormData(event.target).entries()))}.`); }) label { display: block; } <form> <fieldset> <legend>Get a feel for the UX here:</legend> <label>Enter any number: <input name="number" type="number" step="any" required></label> <label>Enter any integer: <input name="integer" type="number" step="1" required></label> <label>Submit: <input name="submitter" type="submit"></label> </fieldset> </form>
你可以用以下方法替换Shurok函数:
$(".numeric").keypress(function() {
return (/[0123456789,.]/.test(String.fromCharCode(Event.which) ))
});
我使用jquery.inputmask.js库，你可以从NuGet下载。 更具体地说，我使用它附带的jquery.inputmask. rerex .extensions.js。
我给输入元素一个类，在本例中是reg:
<input type="number" id="WorkSrqNo" name="WorkSrqNo" maxlength="6" class="reg"/>
然后在JavaScript中设置掩码:
var regexDigitsOnly = "^[0-9]*$";
$('input.reg').inputmask('Regex', { regex: regexDigitsOnly });
这仅适用于数字，但您可以更改正则表达式以接受“.”。
通过使用这种方法，不可能输入非数字的字符。 使用这些inputmask库进行一般格式化是很有用的。
这是geowa4解决方案的扩展版本。支持min和max属性。如果数字超出范围，则显示之前的值。
你可以在这里测试。
用法:<input type=text class='number' maxlength=3 min=1 max=500>
function number(e) {
var theEvent = e || window.event;
var key = theEvent.keyCode || theEvent.which;
if(key!=13&&key!=9){//allow enter and tab
key = String.fromCharCode( key );
var regex = /[0-9]|\./;
if( !regex.test(key)) {
theEvent.returnValue = false;
if(theEvent.preventDefault) theEvent.preventDefault();
}
}
}
$(document).ready(function(){
$("input[type=text]").filter(".number,.NUMBER").on({
"focus":function(e){
$(e.target).data('oldValue',$(e.target).val());
},
"keypress":function(e){
e.target.oldvalue = e.target.value;
number(e);
},
"change":function(e){
var t = e.target;
var min = $(t).attr("min");
var max = $(t).attr("max");
var val = parseInt($(t).val(),10);
if( val<min || max<val)
{
alert("Error!");
$(t).val($(t).data('oldValue'));
}
}
});
});
如果输入是动态的，使用这个:
$(document).ready(function(){
$("body").on("focus","input[type=text].number,.NUMBER",function(e){
$(e.target).data('oldValue',$(e.target).val());
});
$("body").on("keypress","input[type=text].number,.NUMBER",function(e){
e.target.oldvalue = e.target.value;
number(e);
});
$("body").on("change","input[type=text].number,.NUMBER",function(e){
var t = e.target
var min = $(t).attr("min");
var max = $(t).attr("max");
var val = parseInt($(t).val());
if( val<min || max<val)
{
alert("Error!");
$(t).val($(t).data('oldValue'));
}
});
});
你也可以比较输入值(默认情况下被视为字符串)和它本身被强制为数字，比如:
if(event.target.value == event.target.value * 1) {
// returns true if input value is numeric string
}
然而，你需要绑定到事件，如keyup等。
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