[英]Trying to validate my form with error messages, doesn't seem to work
我想传递具有相同功能的不同元素ID
function validate(idname, spnname) {
var getId = document.getElementById(idname);
if(getId === null || getId === undefined || getId === "") {
var getSpn = document.getElementById(spnname).innerHTML = "Required Field";
}
}
validate('firstname', 'spnfirstname');
<body>
<h1>SUBSCRIBE</h1>
<form id="frml" method="get" >
<input type="text" name="fname" placeholder="First Name" class="textbox" id="firstname"/><span id="spnfirstname"></span><br />
<input type="text" name="lname" placeholder="Last Name" s="textbox" id="lastname"/><span id="spnlastname"></span><br />
<input type="date" name="Birthday" value="" class="textbox" id="birthday"/>
<span id="spnbirthday"></span><br />
<input type="email" name="" placeholder="someone@example.com" class="textbox" id="email"/><span id="spnemail"></span><br />
<input type="tel" name="" placeholder="Home Phone" class="textbox" id="homep"/><span id="spnhomep"></span><br />
<input type="tel" name="" placeholder="Cell Phone" class="textbox" id="cellp"/><span id="spncellp"></span><br />
//is there another way to do this onClick event in javascript that may help?
<input id ="btn" type="button" value="Submit" onClick = "return validate()"/>
</form>
</div>
我收到第二个var和html onClick的错误。 我的问题有所不同,因为这里没有正确回答此问题的答案。 我已经尝试了一切。 我不知道为什么我收到此错误消息。
如果您要验证提交时的所有元素,请单击。
您可以使用querySelector选择全部,然后检查每个元素的值。 如果值为“”,则更改同级span元素的innerHTML。
var submit = document.querySelector("#btn") submit.addEventListener("click", function() { var elements = document.querySelectorAll("input"); for (var i = 0; i < elements.length; i++) { if (elements[i].value === "") { elements[i].nextElementSibling.innerHTML = "Required Field"; } } });
<body> <h1>SUBSCRIBE</h1> <form id="frml" method="get"> <input type="text" name="fname" placeholder="First Name" class="textbox" id="firstname" /><span id="spnfirstname"></span> <br /> <input type="text" name="lname" placeholder="Last Name" class="textbox" id="lastname" /><span id="spnlastname"></span> <br /> <input type="date" name="Birthday" value="" class="textbox" id="birthday" /> <span id="spnbirthday"></span> <br /> <input type="email" name="" placeholder="someone@example.com" class="textbox" id="email" /><span id="spnemail"></span> <br /> <input type="tel" name="" placeholder="Home Phone" class="textbox" id="homep" /><span id="spnhomep"></span> <br /> <input type="tel" name="" placeholder="Cell Phone" class="textbox" id="cellp" /><span id="spncellp"></span> <br /> <input id="btn" type="button" value="Submit" /> </form> </div>
两件事情:
1.-使用'value'属性从输入中获取实际值:
var getId = document.getElementById(idname).value;
2.-将函数设置为'click'事件,如果要使用纯Java脚本(紧接在表单之后),则addEventListener可能会有用:
<script>
document.getElementById('btn').addEventListener('click', function(){validate('firstname', 'spnfirstname');});
</script>
这就是我的工作方式。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
function validate(idname, spnname){
var getId = document.getElementById(idname).value;
console.log(getId);
if(getId === null || getId === undefined || getId === ""){
var getSpn = document.getElementById(spnname).innerHTML = "Required Field";
}
}
</script>
</head>
<body>
<h1>SUBSCRIBE</h1>
<form id="frml" method="get">
<input type="text" name="fname" placeholder="First Name" class="textbox" id="firstname"/><span id="spnfirstname"></span><br/>
<input type="text" name="lname" placeholder="Last Name" class="textbox" id="lastname"/><span id="spnlastname"></span><br/>
<input type="date" name="Birthday" value="" class="textbox" id="birthday"/>
<span id="spnbirthday"></span><br/>
<input type="email" name="" placeholder="someone@example.com" class="textbox" id="email"/><span id="spnemail"></span><br/>
<input type="tel" name="" placeholder="Home Phone" class="textbox" id="homep"/><span id="spnhomep"></span><br/>
<input type="tel" name="" placeholder="Cell Phone" class="textbox" id="cellp"/><span id="spncellp"></span><br/>
//is there another way to do this onClick event in javascript that may help
<input id ="btn" type="button" value="Submit"/>
</form>
<script>
document.getElementById('btn').addEventListener('click', function(){validate('firstname', 'spnfirstname');});
</script>
</body
</html>
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