Limit input type (multiple methods)

1. Only Chinese characters can be input and pasted
<input onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))"><br/>

3. Only numbers can be entered and pasted
<input onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')" /><br/>
5. Digital Script
<input onkeyup="if(/\D/.test(this.value)){alert('Only numbers can be entered');this.value='';}"><br/>

6. Only numbers and English can be entered
<input onkeyup="value=value.replace(/[\W]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))"><br/>

8. Simple prohibition of inputting Chinese characters
<input style="ime-mode:disabled">Input method is not converted, but can be pasted<br/>

9. Enter numbers and decimal points
<input onkeyup="value=value.replace(/[^\d{1,}\.\d{1,}|\d{1,}]/g,'')" /><br/>

10. Only numbers and "-", for example, can be used when entering time
<input onkeyup="value=value.replace(/[^\w&=]|_/ig,'')" onblur="value=value.replace(/[^\w&-]|_/ig,'')" />

JS controls input character limit

The ENTER key moves the cursor to the next input box.

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The code is as follows:

<input onkeydown="if(event.keyCode==13)event.keyCode=9" > can only be Chinese
<input onkeyup="value=value.replace(/[ -~]/g,'')" onkeydown="if(event.keyCode==13)event.keyCode=9"> Block input method <input style="ime-mode:disabled" onkeydown="if(event.keyCode==13)event.keyCode=9"> Only English and numbers can be entered
<input onkeyup="value=value.replace(/[/W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^/d]/g,''))" onkeydown="if(event.keyCode==13)event.keyCode=9"> Can only be numbers
<input onkeyup="value=value.replace(/[^/d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^/d]/g,''))">

Can only be displayed, not edited

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The code is as follows:

<input readonly value="can only be displayed, cannot be modified"> can only enter numbers, determine the value of the button
<script language=javascript>
function onlyNum()
{
if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)||(event.keyCode==8)))
event.returnValue=false;
}
</script>
<input onkeydown="onlyNum();">

1. Only numeric codes can be entered in the text box (decimal points cannot be entered)
<input onkeyup="this.value=this.value.replace(//D/g,'')" onafterpaste="this.value=this.value.replace(//D/g,'')">

2. Only numbers can be entered, and decimal points can be entered.
<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">
<input name=txt1 onchange="if(//D/.test(this.value)){alert('Only numbers can be entered');this.value='';}">

3. Numbers and decimal point method 2

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The code is as follows:

4. Only letters and Chinese characters can be input
<input onkeyup="value=value.replace(/[/d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[/d]/g,''))" maxlength=10 name="Numbers">

5. Only English letters and numbers can be entered, Chinese characters cannot be entered
<input onkeyup="value=value.replace(/[^/w/.//]/ig,'')">

6. Only numbers and English can be entered
<font color="Red">chun</font>
<input onKeyUp="value=value.replace(/[^/d|chun]/g,'')">
7. There can be at most two digits after the decimal point (numbers and Chinese characters can be entered), and letters and operation symbols cannot be entered: <input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || //./d/d$/.test(value))event.returnValue=false">8. There can be at most two digits after the decimal point (numbers, letters, and Chinese characters can be entered), and operation symbols can be entered:
<input onkeyup="this.value=this.value.replace(/^(/-)*(/d+)/.(/d/d).*$/,'$1$2.$3')">
Only numbers, decimal points, addition, subtraction, and multiplication can be used.
9. Only numbers, decimal points, and negative numbers can be entered

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The code is as follows:

<input name="input" type="text" onkeyup="JHshNumberText(this)" id="title">

<script language="javascript" type="text/javascript">function JHshNumberText(a)
{
var fa="";
if(a.value.substring(0,1)=="-")
fa="-";
var str=(a.value.replace(/[^0-9.]/g,'')).replace(/[.][0-9]*[.]/, '.');
if (str.substring(0,1)==".")
str="0"+str;
a.value=fa+str;
}
</script>

1. To cancel the dotted box when the button is pressed, add the attribute value hideFocus or HideFocus=true in the input
<input type="submit" value="Submit" hidefocus="true" />

2. To read only the text box content, add the attribute value readonly in input
<input type="text" readonly />

3. Prevent the TEXT document from being cleared after going back (the style content can be used as a class reference)
<input type="text" style="behavior:url(#default#savehistory);" />

4. The ENTER key moves the cursor to the next input box
<input type="text" onkeydown="if(event.keyCode==13)event.keyCode=9" />

5. Only Chinese (flashing)
<input type="text" onkeyup="value=value.replace(/[ -~]/g,'')" onkeydown="if(event.keyCode==13)event.keyCode=9" />

6. Only numbers (flashing)
<input type="text" onkeyup="value=value.replace(/[^/d]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^/d]/g,''))" />

7. Only numbers (no flashing)
<input type="text" style="ime-mode:disabled" onkeydown="if(event.keyCode==13)event.keyCode=9" onkeypress="if ((event.keyCode<48 || event.keyCode>57)) event.returnValue=false" />

8. Only English and numbers can be entered (with flashing)
<input type="text" onkeyup="value=value.replace(/[/W]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^/d]/g,''))" />

9. Block input method
<input type="text" name="url" style="ime-mode: disabled" onkeydown="if(event.keyCode==13)event.keyCode=9" />

10. Only numbers, decimal points, and minus signs (-) can be entered (no flashing)
<input onkeypress="if (event.keyCode!=46 && event.keyCode!=45 && (event.keyCode<48 || event.keyCode>57)) event.returnValue=false" />

11. Only two decimal places or three decimal places can be entered (flashing)
<input type="text" maxlength="9" onkeyup="if(value.match(/^/d{3}$/))value=value.replace(value,parseInt(value/10)) ;value=value.replace(//./d*/./g,'.')" onkeypress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 && event.keyCode!=45 || value.match(/^/d{3}$/) || //./d{3}$/.test(value)) {event.returnValue=false}" />

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