如何使用 jQuery 在 HTML 输入框中只允许数字 (0-9)? [英] How to allow only numeric (0-9) in HTML inputbox using jQuery?

问题描述

我正在创建一个网页，其中有一个输入文本字段，我只想在其中允许数字字符，例如 (0,1,2,3,4,5...9) 0-9.

I am creating a web page where I have an input text field in which I want to allow only numeric characters like (0,1,2,3,4,5...9) 0-9.

我如何使用 jQuery 做到这一点?

How can I do this using jQuery?

推荐答案

^{注意:这是一个更新的答案.下面的评论指的是旧版本，它弄乱了键码.}

^{Note: This is an updated answer. Comments below refer to an old version which messed around with keycodes.}

在 JSFiddle 上自己尝试 在 JSFiddle.

没有针对此的原生 jQuery 实现，但您可以使用以下 inputFilter 插件(支持复制+粘贴)过滤文本 的输入值、拖放、键盘快捷键、上下文菜单操作、不可输入的键、插入符号位置、不同的键盘布局和 IE 9 之后的所有浏览器):

There is no native jQuery implementation for this, but you can filter the input values of a text <input> with the following inputFilter plugin (supports Copy+Paste, Drag+Drop, keyboard shortcuts, context menu operations, non-typeable keys, the caret position, different keyboard layouts, and all browsers since IE 9):

// Restricts input for the set of matched elements to the given inputFilter function.
(function($) {
  $.fn.inputFilter = function(inputFilter) {
    return this.on("input keydown keyup mousedown mouseup select contextmenu drop", function() {
      if (inputFilter(this.value)) {
        this.oldValue = this.value;
        this.oldSelectionStart = this.selectionStart;
        this.oldSelectionEnd = this.selectionEnd;
      } else if (this.hasOwnProperty("oldValue")) {
        this.value = this.oldValue;
        this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd);
      } else {
        this.value = "";
      }
    });
  };
}(jQuery));

您现在可以使用 inputFilter 插件来安装输入过滤器:

You can now use the inputFilter plugin to install an input filter:

$(document).ready(function() {
  $("#myTextBox").inputFilter(function(value) {
    return /^d*$/.test(value);    // Allow digits only, using a RegExp
  });
});

有关更多输入过滤器示例，请参阅 JSFiddle 演示.另请注意，您仍然必须进行服务器端验证！

See the JSFiddle demo for more input filter examples. Also note that you still must do server side validation!

实际上并不需要 jQuery，你也可以用纯 JavaScript 做同样的事情.请参阅此答案.

jQuery isn't actually needed for this, you can do the same thing with pure JavaScript as well. See this answer.

HTML 5 有一个带有 的原生解决方案(请参阅 规范)，但请注意浏览器支持各不相同:

HTML 5 has a native solution with <input type="number"> (see the specification), but note that browser support varies:

• 大多数浏览器只会在提交表单时验证输入，而不会在输入时验证.
• 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.另请参阅这个问题.
• 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.

• Most browsers will only validate the input when submitting the form, and not when typing.
• Most mobile browsers don't support the step, min and max attributes.
• Chrome (version 71.0.3578.98) still allows the user to enter the characters e and E into the field. Also see this question.
• Firefox (version 64.0) and Edge (EdgeHTML version 17.17134) still allow the user to enter any text into the field.

自己尝试在 w3schools.com.

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