HTML 文本输入未使用 Knockout 绑定更新

Question

我正在尝试为 DOB 输入字段自动添加斜线，但 Knockout 绑定效果不佳。

<input 
name=x 
size=10 
maxlength=10 
class="span12" 
placeholder="Date of birth (MM/DD/YYYY)"
  onkeyup="this.value=this.value.replace(/^(\d\d)(\d)$/g,'/').replace(/^(\d\d\/\d\d)(\d+)$/g,'/').replace(/[^\d\/]/g,'')"
  data-bind="value:visitor().dateOfBirth, valueUpdate:'keyup'" />

现在的问题是 Knockout Js 绑定不允许自动更新斜线值。当我在文本框中输入日期时，没有出现斜杠。如何为 myViewModel 设置订阅者以在值更改时修改值？

Answer 1

你应该按照这些思路做一些事情 - 注意你应该从你的 input 标签中删除内联的 onkeyup 并让你的视图模型处理它：

var vm = function () {
  var self = this;
  self.dateOfBirth = ko.observable();
  self.insertSlashes = function () {
     var currentValue = self.dateOfBirth();
     self.dateOfBirth(currentValue
        .replace(/^(\d\d)(\d)$/g,'/')
        .replace(/^(\d\d\/\d\d)(\d+)$/g,'/')
        .replace(/[^\d\/]/g,'')
    );
  }
}
ko.applyBindings(new vm());

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<input 
  placeholder="Date of birth (MM/DD/YYYY)"
  data-bind="value: dateOfBirth, valueUpdate:'keyup', event: { keyup: insertSlashes } " 
/>

HTML 文本输入未使用 Knockout 绑定更新

HTML text input not updating with Knockout Bindings

html

javascript

html-input

knockout.js