인풋 버튼 값을 버튼을 이용하여 입력시 글자수 제한 채택완료

</p>

<p><div style="font-family: 'Exo 2', sans-serif; text-align:center;"></p>

<p><table style="text-align: center;</p>

<p>    margin-left: auto;</p>

<p>    margin-right: auto;"></p>

<p> <input type="text" readonly id="exp" maxlength="4" oninput="maxLengthCheck(this)" name="wr_3" value="<?php echo $wr_3 ?>" placeholder="전화번호 마지막 4자리" style="letter-spacing: 10px; font-family: 'Exo 2', sans-serif; font-size: 40px; text-align: center;" required ></br></br></p>

<p> <span class="error" id="errMsg_02"></span></p>

<p><tr></p>

<p>   <td><input type="button" onfocus="this.blur()" value="1" onClick="enter_exp(document.fwrite.exp,'1')" class="ddd btn-4" readonly="readonly"></td></p>

<p>   <td><input type="button" onfocus="this.blur()" value="2" onClick="enter_exp(document.fwrite.exp,'2')" class="ddd btn-4" readonly="readonly"></td></p>

<p>   <td><input type="button" onfocus="this.blur()" value="3" onClick="enter_exp(document.fwrite.exp,'3')" class="ddd btn-4" readonly="readonly"></td></p>

<p>   <td><input type="button" onfocus="this.blur()" value="←" onClick="enter_exp(document.fwrite.exp,'←')" class="ddd btn-4" readonly="readonly"></td></p>

<p></tr> </p>

<p> </p>

<p><tr></p>

<p>    <td><input type="button" onfocus="this.blur()" value="4" onClick="enter_exp(document.fwrite.exp,'4')" class="ddd btn-4" readonly="readonly"></td></p>

<p>    <td><input type="button" onfocus="this.blur()" value="5" onClick="enter_exp(document.fwrite.exp,'5')" class="ddd btn-4" readonly="readonly"></td></p>

<p>    <td><input type="button" onfocus="this.blur()" value="6" onClick="enter_exp(document.fwrite.exp,'6')" class="ddd btn-4" readonly="readonly"></td></p>

<p>  <td rowspan="3"><input type = "button" onfocus="this.blur()" value= "C" onClick="clear_exp(document.fwrite.exp)" class="btn-4"  style="width:70px; height: 216px; font-size: 30px;"></td></p>

<p></tr></p>

<p><tr></p>

<p>    <td><input type="button" onfocus="this.blur()" value="7" onClick="enter_exp(document.fwrite.exp,'7')" class="ddd btn-4" readonly="readonly"></td></p>

<p>    <td><input type="button" onfocus="this.blur()" value="8" onClick="enter_exp(document.fwrite.exp,'8')" class="ddd btn-4" readonly="readonly"></td></p>

<p>    <td><input type="button" onfocus="this.blur()" value="9" onClick="enter_exp(document.fwrite.exp,'9')" class="ddd btn-4" readonly="readonly"></td></p>

<p></tr></p>

<p> </p>

<p><tr></p>

<p>  <td colspan="3"><input type="button" onfocus="this.blur()" value="0" onClick="enter_exp(document.fwrite.exp,'0')" class="btn-4"  style=" width:216px;   height: 70px; font-size: 30px;" readonly="readonly"></td></p>

<p></tr></p>

<p></table></p>

<p></div></p>

<p> </p>

<p><script LANGUAGE="JavaScript"></p>

<p> </p>

<p>  $('#exp').bind('keyup',function(e){</p>

<p>if($('#exp').val().length>4){</p>

<p>  alert(' 4자리 이내로 입력 가능합니다.');</p>

<p>  $('#exp').val($('#exp').val().substr(0,4));}</p>

<p>});</p>

<p> </p>

<p>function enter_exp(p,str){</p>

<p>if(str=="←") p.value = p.value.substring(0, p.value.length-1);</p>

<p>else p.value+=str; }</p>

<p> </p>

<p>function clear_exp(p){</p>

<p>p.value=""</p>

<p>}</p>

<p></script></p>

<p>