一個檢測表單資料的JavaScript執行個體

最後更新：2017-02-28 來源：互聯網

上載者：User

創建阿里雲帳戶，並獲得超過 40 款產品的免費試用版；而企業帳戶則可以享有總值 $1200 的免費試用版。立即註冊！

一個檢測表單資料的JavaScript執行個體，很簡單，很實用，感興趣的朋友可以看看

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113

<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>每天一個JavaScript執行個體-檢測表單資料</title> <style> [role="alert"]{ background-color: #fcc; font-weight: bold; padding:5px; border:1px dashed #000; } div{ margin:10px 0; padding:5px; width:400px; background-color: #fff; } </style> <script> window.onload = function(){ document.getElementById("thirdfield").onchange = validateField; document.getElementById("firstfield").onblur = mandatoryField; document.getElementById("testform").onsubmit = finalCheck; } function validateField(){ removeAlert(); if(!isNaN(parseFloat(this.value))){ resetField(this); }else{ badField(this); generateAlert("You entered an invalid value in Third Field. only numeric values such as 105 or 3.45 are allowed"); } } function removeAlert(){ var msg = document.getElementById("msg"); if(msg){ document.body.removeChild(msg); } } function resetField(elem){ elem.parentNode.setAttribute("style","background-color:#fff"); var valid = elem.getAttribute("aria-invalid"); if(valid) elem.removeAttribute("aria-invalid"); } function badField(elem){ elem.parentNode.setAttribute("style","background-color#fee"); elem.setAttribute("aria-invalid","true"); } function generateAlert(txt){ var txtNd = document.createTextNode(txt); msg = document.createElement("div"); msg.setAttribute("role","alert"); msg.setAttribute("id","msg"); msg.setAttribute("class","alert"); msg.appendChild(txtNd); document.body.appendChild(msg); } function mandatoryField(){ removeAlert(); if(this.value.length > 0 ){ resetField(this); }else{ badField(this); generateAlert("You must enter a value into First Field"); } } function finalCheck(){ //console.log("aaa"); removeAlert(); var fields =document.querySelectorAll('input[aria-invalid="true"]'); //var fields =document.querySelectorAll("input[aria-invalid='true']");//錯誤！！！ console.log(fields); if(fields.length > 0){ generateAlert("You have incorrect fields entries that must be fixed before you can submit this form"); return false; } } </script> </head> <body> <form id = "testform"> <div> <label for="firstfield">*first Field:</label><br /> <input id="firstfield" name = "firstfield" type = "text" aria-required = "true" /> </div> <div> <label for="secondfield">Second Field:</label><br /> <input id="secondfield" name = "secondfield" type = "text" /> </div> <div> <label for="thirdfield">Third Field(numeric):</label><br /> <input id="thirdfield" name = "thirdfield" type = "text" /> </div> <div> <label for="fourthfield">Fourth Field:</label><br /> <input id="fourthfield" name = "fourthfield" type = "text" /> </div> <input type="submit" value = "Send Data" /> </form> </body> </html>

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More