如何限制輸入字段數字在淘汰賽js

Question

我有一個輸入字段，我想限制它只用於數值。我怎樣才能做到這一點在這裏淘汰賽JS

是我的領域

<input data-bind="value: nsc" /> 

Answer 1

想這問題是已經回答了。 您可能需要創建只接受允許的字符的自定義綁定。

這個問題的答案在此鏈接後會幫助你：make an input only-numeric type on knockout

Answer 2

你可以寫在你的視圖模型的功能。

ko.extenders.numeric = function(target, precision) { 
//create a writable computed observable to intercept writes to our observable 
var result = ko.pureComputed({ 
    read: target, //always return the original observables value 
    write: function(newValue) { 
     var current = target(), 
      roundingMultiplier = Math.pow(10, precision), 
      newValueAsNum = isNaN(newValue) ? 0 : parseFloat(+newValue), 
      valueToWrite = Math.round(newValueAsNum * roundingMultiplier)/roundingMultiplier; 

     //only write if it changed 
     if (valueToWrite !== current) { 
      target(valueToWrite); 
     } else { 
      //if the rounded value is the same, but a different value was written, force a notification for the current field 
      if (newValue !== current) { 
       target.notifySubscribers(valueToWrite); 
      } 
     } 
    } 
}).extend({ notify: 'always' }); 

//initialize with current value to make sure it is rounded appropriately 
result(target()); 

//return the new computed observable 
return result; 

};

檢查此鏈接如何使用：Sample code