一个文本框只允许输入数字

Posted 2023-03-19

一个文本框只允许输入数字，这个应该怎么去做啊？…..大于0
<input name="page" type="text" size="14" maxlength="14">

你试试把那行代码改成这样:
<input name="page" type="text" size="14" maxlength="14" onkeyup='this.value=this.value.replace(/\D/gi,"")'> 参考技术A 可以在提交时判断下是不是属于0-9。不是就提示出错 参考技术B Delphi是这样表示的
if not (key in ['0'..'9']) then
begin
edit1.text:='';
showmessage('请输入纯数字');
end; 参考技术C 下面两种都行～
<input class=textarea1 size=80 type=text name=txtPostalCode onKeypress="if (event.keyCode < 45 || event.keyCode > 57) event.returnValue = false;">

<input onkeyup="value=value.replace(/[^\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))"> 参考技术D 使用正规表达式
以js脚本为例:
this.value=this.value.replace(/[^0-9]\D*$/,"")

WPF文本框只允许输入数字

XAML代码

 

< TextBox Height="23" HorizontalAlignment="Left" Margin="100,5,0,0" Name="textBox1" VerticalAlignment="Top"
Width="120" DataObject.Pasting="textBox1_Pasting" PreviewKeyDown="textBox1_PreviewKeyDown"
InputMethod.IsInputMethodEnabled="False" PreviewTextInput="textBox1_PreviewTextInput"/ >

 

  

 

  

 

cs代码

 

  

 

//检测粘贴

        private void textBox1_Pasting(object sender, DataObjectPastingEventArgs e)

        {

            if (e.DataObject.GetDataPresent(typeof(String)))

            {

                String text = (String)e.DataObject.GetData(typeof(String));

                if (!isNumberic(text))

                { e.CancelCommand(); }

            }

            else { e.CancelCommand(); }

        }

 

  

 

        private void textBox1_PreviewKeyDown(object sender, KeyEventArgs e)

        {

            if (e.Key == Key.Space)

                e.Handled = true;

        }

 

  

 

        private void textBox1_PreviewTextInput(object sender, TextCompositionEventArgs e)

        {

            if (!isNumberic(e.Text))

            {

                e.Handled = true;

            }

            else

                e.Handled = false;

        }

 

 

        //isDigit是否是数字

        public static bool isNumberic(string _string)

        {

            if (string.IsNullOrEmpty(_string))

                return false;

            foreach (char c in _string)

            {

                if (!char.IsDigit(c))

                    //if(c<‘0‘ c="">‘9‘)//最好的方法,在下面测试数据中再加一个0，然后这种方法效率会搞10毫秒左右

                    return false;

            }

            return true;

        }