下面的代碼驗證了帶有兩個字段的表單。當我單擊沒有任何數據的提交按鈕時,錯誤消息會顯示哪些工作正常,但如果我輸入數據後單擊提交按鈕,錯誤消息不會消失。點擊提交後,JavaScript驗證錯誤消息沒有消失
<script>
function validateForm() {
var valid = true;
var x = document.forms["myForm"]["activityName"].value;
if (x == "" || x == null) {
document.getElementById("activityName").innerHTML = "Please Enter Activity Name";
valid= false;
}
var r = document.forms["myForm"]["reporter"].value;
if (r == "") {
document.getElementById("reporter").innerHTML = "Please Enter Reporter";
valid = false;
}
return valid;
}
</script>
</head>
<body>
<form action="#" method="post" name="myForm" onsubmit=" return validateForm()">
<div>
<label for="myActivityName">*Activity Name:</label>
<input type="text" name="activityName" value="" placeholder="Enter Activity Name" />
<p id="activityName"></p>
</div><br>
<div>
<label for="reporter">*Reporter:</label>
<input type="text" name="reporter" value="" placeholder="Enter Reporter " />
<p id="reporter"></p>
</div><br>
<input type="submit" value="Submit" >
</form>
</body>
非常感謝您,先生,但我能問你一件事,你知道我必須把確認對話框,以便在它檢查驗證之後,我點擊提交按鈕它會詢問是否接受數據或取消它以進行更改? –
對於評論的解釋太長,但看看這裏:http://www.javascripter.net/faq/confirm.htm –