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每天一個JavaScript執行個體-檢測表單資料

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<!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>

每天一個JavaScript執行個體-檢測表單資料

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