使用javascript将文本框值限制为数字，也只限制一个小数点。 [英] restricting a text box value to numbers and also only one decimal point using javascript.

问题描述

我在我的项目中使用表单，并且在该表单中有一个文本框，该文本框应该只包含数字，并且只有一个小数点数字或者只是正常的整数，例如：10,10.55,11.66左右......前者不应该超过一个小数点：10.5.4不应该采取。



我用javascript做了如下：

 function isNumberKey（evt）
 {
  var  charCode =（evt.which）？ evt.which： event  .keyCode; 
  if （charCode！=  46 && charCode >   31 &&（charCode <   48  || charCode >   57 ））
  return   false ; 
 
  return   true ; 
} 

这只允许数字，也指向。所以它需要任意数量的点来限制我使用像这样的js：

 function checkDec（el）{
 < span class =code-keyword> var  ex = /^ [0-9] + \。？[0-9] * $ /; 
  if （ex.test（el。 value ）==  false ）{
 alert（' 错误的数字'） ; 
} 

我使用的文本框是这样的：

< input type =textclass =TextBoxrunat =serverid =txtDateFromonkeypress =return isNumberKey（event）;的onblur = checkDec（本）; /> 

但这不是将小数点限制为单个小数点。 PLease帮助我如何限制用户并允许他们输入一个小数点....我应该使用任何onclick事件？我喜欢的是一个onkeypress事件检查...这可能请帮助...



提前感谢你!!

解决方案

/;
if （ex.test（el。 value ）== false ）{
alert（' 错误的数字'） ;
}

我使用的文本框是这样的：

< input type =textclass =TextBoxrunat =serverid =txtDateFromonkeypress =return isNumberKey（event）;的onblur = checkDec（本）; /> 

但这不是将小数点限制为单个小数点。 PLease帮助我如何限制用户并允许他们输入一个小数点....我应该使用任何onclick事件？我喜欢的是一个onkeypress事件检查...这可能请帮助...



提前感谢你!!

< blockquote>使用FilteredTextBox ajax控件

Hi,

I am using a form in my project and in that form there is a text box which should take only numbers and also only one decimal point numbers or just normal integers for ex: 10, 10.55, 11.66 or so on... it should not take more than a single decimal point for ex: 10.5.4 should not take.

I had done it using javascript as follows:

function isNumberKey(evt)
{
    var charCode = (evt.which) ? evt.which : event.keyCode;
    if (charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57))
        return false;

    return true;
}

this allows only numbers and also point that is "." so it takes any number of points to restrict i used like this js:

function checkDec(el) {
    var ex = /^[0-9]+\.?[0-9]*$/;
    if (ex.test(el.value) == false) {
        alert('Incorrect Number');
    }

the text box i used was like this :

<input type="text" class="TextBox" runat="server" id="txtDateFrom" onkeypress="return isNumberKey(event);" onblur="checkDec(this);" />

But this is not restricting the decimal point to single decimal point. PLease help me with how i can i restrict user and allow them to enter a single decimal point .... and should i use any onclick event ? what i prefer ia an onkeypress event check ... Is that Possible please help...

Thanking You in advance!!

解决方案

/; if (ex.test(el.value) == false) { alert('Incorrect Number'); }

the text box i used was like this :

<input type="text" class="TextBox" runat="server" id="txtDateFrom" onkeypress="return isNumberKey(event);" onblur="checkDec(this);" />

But this is not restricting the decimal point to single decimal point. PLease help me with how i can i restrict user and allow them to enter a single decimal point .... and should i use any onclick event ? what i prefer ia an onkeypress event check ... Is that Possible please help...

Thanking You in advance!!

use FilteredTextBox ajax control

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