javascript - jquery restricting numbers greater than required -

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In jquery, there is a need to restrict the typing of more than 20 numbers into a text box, how to implement it.

Any help is appreciated. 

  & lt; Table & gt; & Lt; TR & gt; & Lt; TD & gt; & Lt; H: Input text id = "actual card" style class = "input-lesson-bx" & gt; & Lt; / H: Input Text & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt; / Table & gt; Attr ('maxlength',    
 
 
  $ ("# physical card") '20'); For verification of numbers: Validate  
  $ ("# actual card") ({rule: {field: {expected: true, number: true}}});

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