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一个检测表单数据的JavaScript实例

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一个检测表单数据的JavaScript实例,很简单,很实用,感兴趣的朋友可以看看 。

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<!DOCTYPE html>
< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=UTF-8" />
< title >每天一个JavaScript实例-检测表单数据</ 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']");//错误!!!
   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 >

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