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直接粘貼到html文件便可看到效果
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script> <script> // 這是第一種最尋常的方法 //定義一個(gè)函數(shù) function checkField(value, byteLength, attribute) { // value是input框的值,byteLength是需求限制的字符,attribute是input的id名 var newvalue = value.replace(/[^\x00-\xff]/g, "**"); var length = newvalue.length; //當(dāng)填寫的字節(jié)數(shù)小于設(shè)置的字節(jié)數(shù) if (length * 1 <= byteLength * 1) { return; } var limitDate = newvalue.substr(0, byteLength); var count = 0; var limitvalue = ""; for (var i = 0; i < limitDate.length; i++) { var flat = limitDate.substr(i, 1); if (flat == "*") { count++; } } var size = 0; var istar = newvalue.substr(byteLength * 1 - 1, 1); //校驗(yàn)點(diǎn)是否為“×” //if 基點(diǎn)是×; 判斷在基點(diǎn)內(nèi)有×為偶數(shù)還是奇數(shù) if (count % 2 == 0) { //當(dāng)為偶數(shù)時(shí) size = count / 2 + (byteLength * 1 - count); limitvalue = value.substr(0, size); } else { //當(dāng)為奇數(shù)時(shí) size = (count - 1) / 2 + (byteLength * 1 - count); limitvalue = value.substr(0, size); } alert( "最大輸入" + byteLength + "個(gè)字節(jié)(相當(dāng)于" + byteLength / 2 + "個(gè)漢字)!" ); document.getElementById(attribute).value = limitvalue; return; } </script> </head> <body> <div class="wrap"> <form> <table class="list-style"> <tr> <td >職業(yè):</td> <td> <input id="profession" type="text" "checkField(this.value,20,'profession')" class="textBox length-middle" name="profession"/> <input id="interest" type="text" "checkField(this.value,100,'interest')" class="textBox length-middle" name="interest"/> <input id="address" "checkField(this.value,40,'address')" type="text" class="textBox length-middle" name="address" /> </td> </tr> </table> <div > <button type="reset" "refresh()" > 重置 </button> <button type="submit" "return checkNull()" > 提交 </button> </div> </form> </div> </body> </html>
以上所述是小編給大家介紹的js form表單input框限制20個(gè)字符,10個(gè)漢字詳解整合,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對億速云網(wǎng)站的支持!
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