blocks|key|406541|text|您可以使用RegularExpressionValidator来实现这一点。以下是示例代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|406542|<asp:TextBox+ID="TextBox1"+runat="server"></asp:TextBox>
<asp:RegularExpressionValidator+ID="RegularExpressionValidator1"
++++ControlToValidate="TextBox1"+runat="server"
++++ErrorMessage="Only+Numbers+allowed"
++++ValidationExpression="\d%2B">
</asp:RegularExpressionValidator>|code-block|syntax|javascript|406543|上面的TextBox只允许输入整数，因为在RegularExpressionValidator中有一个名为ValidationExpression的字段，用于验证TextBox。但是，您可以根据需要进行修改。|406544|你可以在MVC和Jquery+here中看到更多的例子。|offset|length|406545|entityMap|0|LINK|mutability|MUTABLE|url|http://www.dotnetpoints.com/allow-only-integers-in-a-textbox-1^0|0|0|0|F|4|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

You can use RegularExpressionValidator for this. below is the sample code:

<pre><code>&lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt;
&lt;asp:RegularExpressionValidator ID="RegularExpressionValidator1"
 ControlToValidate="TextBox1" runat="server"
 ErrorMessage="Only Numbers allowed"
 ValidationExpression="\d+"&gt;
&lt;/asp:RegularExpressionValidator&gt;
</code></pre>

above TextBox only allowed integer to be entered because in RegularExpressionValidator has field called ValidationExpression, which validate the TextBox. However, you can modify as per your requirement.

You can see more example in MVC and Jquery <a href="http://www.dotnetpoints.com/allow-only-integers-in-a-textbox-1" rel="noreferrer">here</a>.

blocks|key|406470|text|<HTML>
+++<HEAD>
+++<SCRIPT+language=Javascript>
++++++function+isNumberKey(evt)
++++++{
+++++++++var+charCode+=+(evt.which)+?+evt.which+:+evt.keyCode;
+++++++++if+(charCode+>+31+&&+(charCode+<+48+%7C%7C+charCode+>+57))
++++++++++++return+false;++++
+++++++++return+true;
++++++}
+++</SCRIPT>
+++</HEAD>
+++<BODY>
++++++<INPUT+id="txtChar"+onkeypress="return+isNumberKey(event)"+type="text"+name="txtChar">
+++</BODY>
</HTML>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|406471|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;HTML&gt;
 &lt;HEAD&gt;
 &lt;SCRIPT language=Javascript&gt;
 function isNumberKey(evt)
 {
 var charCode = (evt.which) ? evt.which : evt.keyCode;
 if (charCode &gt; 31 &amp;&amp; (charCode &lt; 48 || charCode &gt; 57))
 return false; 
 return true;
 }
 &lt;/SCRIPT&gt;
 &lt;/HEAD&gt;
 &lt;BODY&gt;
 &lt;INPUT id="txtChar" onkeypress="return isNumberKey(event)" type="text" name="txtChar"&gt;
 &lt;/BODY&gt;
&lt;/HTML&gt;
</code></pre>

blocks|key|622044|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622045|注意:这是使用Ajax工具包|622046|首先添加Ajax脚本管理器并使用以下代码|622047|<asp:FilteredTextBoxExtender+ID="TextBox1_FilteredTextBoxExtender"+runat="server"
Enabled="True"+TargetControlID="TextBox1"+FilterType="Numbers">
</asp:FilteredTextBoxExtender>|code-block|syntax|javascript|622048|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Try this:

Note:This is using Ajax Toolkit

First add Ajax Script Manager and use the below Code

<pre><code>&lt;asp:FilteredTextBoxExtender ID="TextBox1_FilteredTextBoxExtender" runat="server"
Enabled="True" TargetControlID="TextBox1" FilterType="Numbers"&gt;
&lt;/asp:FilteredTextBoxExtender&gt;
</code></pre>

blocks|key|408282|text|一种更简单的方法是使用TextMode属性：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|408283|<asp:TextBox+runat="server"+ID="txtTextBox"+TextMode="Number">|code-block|syntax|javascript|408284|entityMap^0|B|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

An even easier method is to use the <code>TextMode</code> attribute:

<pre><code>&lt;asp:TextBox runat="server" ID="txtTextBox" TextMode="Number"&gt;
</code></pre>

blocks|key|622279|text|试试这个吧|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622280|注意:这是使用Ajax工具包|622281|首先添加Ajax脚本管理器，然后使用下面的代码将过滤器应用于文本框|622282|在asp.net页面的开头提供命名空间|622283|<%25@+Register+Assembly="AjaxControlToolkit"+Namespace="AjaxControlToolkit"+TagPrefix="cc1"+%25>

<asp:TextBox+ID="TxtBox"+runat="server"></asp:TextBox>
<cc1:FilteredTextBoxExtender+ID="FilteredTextBoxExtender1"+runat="server"+Enabled="True"+TargetControlID="TxtBox"+FilterType="Numbers"+FilterMode="ValidChars">
</cc1:FilteredTextBoxExtender>|code-block|syntax|javascript|622284|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

try this instead

Note:This is using Ajax Toolkit

First add Ajax Script Manager and use the below Code to apply filter to the textbox

Provide the Namespace at the beginning of the asp.net page

<pre><code>&lt;%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %&gt;

&lt;asp:TextBox ID="TxtBox" runat="server"&gt;&lt;/asp:TextBox&gt;
&lt;cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" runat="server" Enabled="True" TargetControlID="TxtBox" FilterType="Numbers" FilterMode="ValidChars"&gt;
&lt;/cc1:FilteredTextBoxExtender&gt;
</code></pre>

blocks|key|622372|text|循序渐进|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622373|假设您有一个文本框，如下所示：|622374|<asp:TextBox+ID="TextBox13"+runat="server"+
++onkeypress="return+functionx(event)"+>
</asp:TextBox>|code-block|syntax|javascript|622375|您可以像这样创建一个JavaScript函数：|622376|+++++<script+type+=+"text/javascript">
+++++++++function+functionx(evt)+
+++++++++{
++++++++++++if+(evt.charCode+>+31+&&+(evt.charCode+<+48+%7C%7C+evt.charCode+>+57))
++++++++++++++++++{
++++++++++++++++++++alert("Allow+Only+Numbers");
++++++++++++++++++++return+false;
++++++++++++++++++}
++++++++++}
+++++</script>|622377|if语句的第一部分排除了ASCII控制字符，或语句排除了不是数字的任何内容|622378|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

step by step 

given you have a textbox as following,

<pre><code>&lt;asp:TextBox ID="TextBox13" runat="server" 
 onkeypress="return functionx(event)" &gt;
&lt;/asp:TextBox&gt;
</code></pre>

you create a JavaScript function like this:

<pre><code> &lt;script type = "text/javascript"&gt;
 function functionx(evt) 
 {
 if (evt.charCode &gt; 31 &amp;&amp; (evt.charCode &lt; 48 || evt.charCode &gt; 57))
 {
 alert("Allow Only Numbers");
 return false;
 }
 }
 &lt;/script&gt;
</code></pre>

the first part of the if-statement excludes the ASCII control chars, the or statements exclued anything, that is not a number

blocks|key|407604|text|另一种解决方案是在设置Type="Integer"的地方使用RangeValidator，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|407605|<asp:RangeValidator+runat="server"
++++id="valrNumberOfPreviousOwners"
++++ControlToValidate="txtNumberOfPreviousOwners"
++++Type="Integer"
++++MinimumValue="0"
++++MaximumValue="999"
++++CssClass="input-error"
++++ErrorMessage="Please+enter+a+positive+integer."
++++Display="Dynamic">
</asp:RangeValidator>|code-block|syntax|javascript|407606|您也可以为MinimumValue和MaximumValue属性设置合理的值。|407607|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/en-us/library/f70d09xt(v=vs.71).aspx^0|B|E|U|E|0|0|0|5|C|I|C|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Another solution is to use a <a href="https://msdn.microsoft.com/en-us/library/f70d09xt(v=vs.71).aspx" rel="nofollow">RangeValidator</a> where you set <code>Type="Integer"</code> like this:

<pre><code>&lt;asp:RangeValidator runat="server"
 id="valrNumberOfPreviousOwners"
 ControlToValidate="txtNumberOfPreviousOwners"
 Type="Integer"
 MinimumValue="0"
 MaximumValue="999"
 CssClass="input-error"
 ErrorMessage="Please enter a positive integer."
 Display="Dynamic"&gt;
&lt;/asp:RangeValidator&gt;
</code></pre>

You can set reasonable values for the <code>MinimumValue</code> and <code>MaximumValue</code> attributes too.

blocks|key|622822|text|您可以使用客户端验证：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622823|<asp:textbox+onkeydown="return+(!(event.keyCode>=65)+&&+event.keyCode!=32);"+/>|code-block|syntax|javascript|622824|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use client-side validation:

<pre><code>&lt;asp:textbox onkeydown="return (!(event.keyCode&gt;=65) &amp;&amp; event.keyCode!=32);" /&gt;
</code></pre>

blocks|key|622403|text|可以使用比较验证器完成此操作，如下所示。与其他答案不同，这也允许输入负数，这对整数值有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622404|<asp:TextBox+ID="TextBox1"+runat="server"></asp:TextBox>
<asp:CompareValidator+ControlToValidate="TextBox1"+runat="server"+ErrorMessage="Integers+only+please"+Operator="DataTypeCheck"+Type="Integer"+></asp:CompareValidator>|code-block|syntax|javascript|622405|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It can be done with a compare validator as below. Unlike the other answers, this also allows negative numbers to be entered, which is valid for integer values.

<pre><code>&lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt;
&lt;asp:CompareValidator ControlToValidate="TextBox1" runat="server" ErrorMessage="Integers only please" Operator="DataTypeCheck" Type="Integer" &gt;&lt;/asp:CompareValidator&gt;
</code></pre>

blocks|key|406876|text|只需使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|406877|<input+type="number"+id="foo"+runat="server"+/>|code-block|syntax|javascript|406878|它可以在除IE+%2B10以外的所有现代浏览器上运行。以下是完整列表：|406879|http://caniuse.com/#feat=input-number|offset|length|406880|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|11|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|W|8|@]|9|@$K|X|L|Y|1|Z]]|A|$]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|J]]]]

Just use

<pre><code>&lt;input type="number" id="foo" runat="server" /&gt;
</code></pre>

It'll work on all modern browsers except IE +10. Here is a full list:

<a href="http://caniuse.com/#feat=input-number" rel="nofollow">http://caniuse.com/#feat=input-number</a>

blocks|key|622476|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622477|<input+type="text"++onkeypress+=+"return+isDigit(event,this.value);"/>

function+isDigit(evt,+txt)+{
++++++++var+charCode+=+(evt.which)+?+evt.which+:+event.keyCode

++++++++var+c+=+String.fromCharCode(charCode);

++++++++if+(txt.indexOf(c)+>+0+&&+charCode+==+46)+{
++++++++++++return+false;
++++++++}
++++++++else+if+(charCode+!=+46+&&+charCode+>+31+&&+(charCode+<+48+%7C%7C+charCode+>+57))+{
++++++++++++return+false;
++++++++}

++++++++return+true;
++++}|code-block|syntax|javascript|622478|在onkeypress事件上从输入文本框调用此函数|622479|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try This : 

<pre><code>&lt;input type="text" onkeypress = "return isDigit(event,this.value);"/&gt;

function isDigit(evt, txt) {
 var charCode = (evt.which) ? evt.which : event.keyCode

 var c = String.fromCharCode(charCode);

 if (txt.indexOf(c) &gt; 0 &amp;&amp; charCode == 46) {
 return false;
 }
 else if (charCode != 46 &amp;&amp; charCode &gt; 31 &amp;&amp; (charCode &lt; 48 || charCode &gt; 57)) {
 return false;
 }

 return true;
 }
</code></pre>

Call this function from input textbox on onkeypress event

blocks|key|406931|text|您可以使用RegularExpressionValidator|type|unstyled|depth|inlineStyleRanges|entityRanges|data|406932|<asp:TextBox+ID="viewTextBox"+runat="server"+Text="0"></asp:TextBox>
<asp:RegularExpressionValidator+ID="viewRegularExpressionValidator"+runat="server"+ValidationExpression="[0-9]{1,50}"+ControlToValidate="viewTextBox"+ErrorMessage="Please+Enter+numbers+only">*</asp:RegularExpressionValidator>|code-block|syntax|javascript|406933|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use RegularExpressionValidator 

<pre><code>&lt;asp:TextBox ID="viewTextBox" runat="server" Text="0"&gt;&lt;/asp:TextBox&gt;
&lt;asp:RegularExpressionValidator ID="viewRegularExpressionValidator" runat="server" ValidationExpression="[0-9]{1,50}" ControlToValidate="viewTextBox" ErrorMessage="Please Enter numbers only"&gt;*&lt;/asp:RegularExpressionValidator&gt;
</code></pre>

blocks|key|622198|text|我们可以使用javascript代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622199|function+validateAlphaNumericCode(event)+{
++++keyEntry+=+(event.which)+?+event.which+:+event.keyCode

++++if+(((keyEntry+>=+'65')+&&+(keyEntry+<=+'90'))+%7C%7C+((keyEntry+>=+'97')+&&+(keyEntry+<=+'122'))+%7C%7C+(keyEntry+==+'37')+%7C%7C+(keyEntry+==+'39')+%7C%7C+(keyEntry+==+'46')+%7C%7C+(keyEntry+==+'8')+%7C%7C+(keyEntry+==+'9')+%7C%7C+(keyEntry+==+'95')+%7C%7C+((keyEntry+>=+'48')+&&+(keyEntry+<=+'57')))
++++++++return+true;
++++else
++++++++return+false;
}|code-block|syntax|javascript|622200|用你的文本框验证这段代码。|622201|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

we can use javascript code

<pre><code>function validateAlphaNumericCode(event) {
 keyEntry = (event.which) ? event.which : event.keyCode

 if (((keyEntry &gt;= '65') &amp;&amp; (keyEntry &lt;= '90')) || ((keyEntry &gt;= '97') &amp;&amp; (keyEntry &lt;= '122')) || (keyEntry == '37') || (keyEntry == '39') || (keyEntry == '46') || (keyEntry == '8') || (keyEntry == '9') || (keyEntry == '95') || ((keyEntry &gt;= '48') &amp;&amp; (keyEntry &lt;= '57')))
 return true;
 else
 return false;
}
</code></pre>

validate this code with your textbox.

blocks|key|622550|text|function+CheckNumeric(event)+{
++++var+_key+=+(window.Event)+?+event.which+:+event.keyCode;

++++if+((_key+>+95+&&+_key+<+106)+%7C%7C+(_key+>+47+&&+_key+<+58)+%7C%7C+_key+==+8+%7C%7C+_key+==+9+%7C%7C+_key+==+37+%7C%7C+_key+==+39+%7C%7C+_key+==+190+%7C%7C+_key+==+110)+{
++++++++return+true;
++++}
++++else+{
++++++++return+false;
++++}
}

<input+type="text"+onkeydown="return+CheckNumerick(event);"+/>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|622551|接受键:数字%2B+NumPedNumbers+%2B+Tab+%2B+"，“%2B+".”%2B+LeftButton+%2B+RightButton+%2BDelete键%2B+BackSpace|unstyled|622552|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>function CheckNumeric(event) {
 var _key = (window.Event) ? event.which : event.keyCode;

 if ((_key &gt; 95 &amp;&amp; _key &lt; 106) || (_key &gt; 47 &amp;&amp; _key &lt; 58) || _key == 8 || _key == 9 || _key == 37 || _key == 39 || _key == 190 || _key == 110) {
 return true;
 }
 else {
 return false;
 }
}

&lt;input type="text" onkeydown="return CheckNumerick(event);" /&gt;
</code></pre>

Accept Keys: Numbers + NumPedNumbers + Tab + "," + "." + LeftButton + RightButton + Delete + BackSpace

blocks|key|622098|text|if+(document.de.your_textbox_id.value+!=+"")

{++++++++++
+++var+checkOK+=+"0123456789";
+++var+checkStr+=+document.de.your_textbox_id.value;++++++++
+++var+allValid+=+true;
+++for+(i+=+0;++i+<+checkStr.length;++i%2B%2B)
+++{
++++ch+=+checkStr.charAt(i);+++++++++++
++++for+(j+=+0;++j+<+checkOK.length;++j%2B%2B)
++++if+(ch+==+checkOK.charAt(j))
++++break;
++++if+(j+==+checkOK.length)
++++++{
+++++++allValid+=+false;
+++++++break;
++++++}
++++}++++++
++++if+(!allValid)
++++{+++++++++++
+++++++alert("Please+enter+only+numeric+characters+in+the+text+box.");
+++++++document.de.your_textbox_id.focus();++++++++++++++++++++++++++++
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|622099|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if (document.de.your_textbox_id.value != "")

{ 
 var checkOK = "0123456789";
 var checkStr = document.de.your_textbox_id.value; 
 var allValid = true;
 for (i = 0; i &lt; checkStr.length; i++)
 {
 ch = checkStr.charAt(i); 
 for (j = 0; j &lt; checkOK.length; j++)
 if (ch == checkOK.charAt(j))
 break;
 if (j == checkOK.length)
 {
 allValid = false;
 break;
 }
 } 
 if (!allValid)
 { 
 alert("Please enter only numeric characters in the text box.");
 document.de.your_textbox_id.focus(); 
 }
}
</code></pre>

blocks|key|407561|text|正则表达式验证器下的用户。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|407562|++++<asp:RegularExpressionValidator+ID="RegularExpressionValidatorNumeric"+runat="server"+ControlToValidate="yourControl+ID"+ErrorMessage="Registraion+ID+Should+be+a+Numeric"+ValidationExpression="%5E\d%2B$"++></asp:RegularExpressionValidator>|code-block|syntax|javascript|407563|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

User below regular expression validator. 

<pre><code> &lt;asp:RegularExpressionValidator ID="RegularExpressionValidatorNumeric" runat="server" ControlToValidate="yourControl ID" ErrorMessage="Registraion ID Should be a Numeric" ValidationExpression="^\d+$" &gt;&lt;/asp:RegularExpressionValidator&gt;
</code></pre>

blocks|key|622841|text|我会使用ASP.NET+Ajax过滤器TextBoxExtender控件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|622842|https://www.aspsnippets.com/Articles/ASPNet-AJAX-FilteredTextBoxExtender-Control-Example.aspx|offset|length|622843|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2L|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

I would use ASP.NET Ajax Filter TextBoxExtender control

<a href="https://www.aspsnippets.com/Articles/ASPNet-AJAX-FilteredTextBoxExtender-Control-Example.aspx" rel="nofollow noreferrer">https://www.aspsnippets.com/Articles/ASPNet-AJAX-FilteredTextBoxExtender-Control-Example.aspx</a>

In my form I want to allow typing of integer values only in a textbox. How to do that?

How to allow only integers in a textbox?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在我的表单中，我希望只允许在文本框中键入整数值。如何做到这一点？

问如何在文本框中只允许整数？
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回答 17

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问如何在文本框中只允许整数？
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