Knowledge --- input numerical only

Limit input box can only enter pure digital input

1、onkeyup = "value=value.replace(/[^\d]/g,'')"

 

Use onkeyup event, there are bug, that is, in the Chinese input method status, just press Enter after input Chinese characters, will directly enter the letters

2、

onchange = "value=value.replace(/[^\d]/g,'')"

 

Use onchange event, after typing in, lose focus when only input will get results, not just respond when input

3、

oninput = "value=value.replace(/[^\d]/g,'')"

 

Use oninput event, the perfect solution to these two problems, the test had no other problems.

Code Example
 <! DOCTYPE HTML > 
< HTML lang = "EN" > 
< head > 
< Meta charset = "UTF-. 8"  /> 
< title > INPUT </ title > 
</ head > 
< body > 
only purely digital input input box: < iNPUT type = "text" name = "" onInput = "value = value.replace (/ [^ \ D] / G, '')" > 
</ body > 
</ HTML >