我对编码比较陌生--在表单验证方面工作,我的formValidation函数不能让页面真正返回false (如果用户输入了不正确的isbn长度,就不能提交表单)。想知道我错过了什么。
无论isbn.length是什么,都会弹出警报并提交表单-但是,如果它的长度正确,它就会被添加到数据库中,并被重新路由到主页。如果长度不正确,它会被路由到"This page isn not working localhost not send any data. ERR_EMPTY_RESPONSE“。
Javascript:
//function to validate the form's ISBN number input and ensure it's between 10-14 digits.
function formValidation(){
var isbn = document.forms["sellForm"]["isbn"];
if (isbn.length >= 10 && isbn.length <= 14){
return true;
}
else
{
alert("Please input a 10-14 digit ISBN number");
isbn.focus();
return false;
}
}
</script>
对应的HTML:
<form name="sellForm" method="POST" action="/create" role="form" onsubmit="formValidation()">
<div class="form-group">
<label for="role" >ISBN</label>
<input type="number" size=14 class="form-control" name="isbn" id="role" required
placeholder="input the 10-14 digit ISBN number"/>
</div>
<div class="form-group">
<label for="age">Condition</label>
<br>
<input type="radio" name="book_condition" value="Very Used"> Very Used<br>
<input type="radio" name="book_condition" value="Lightly Used"> Lightly Used<br>
<input type="radio" name="book_condition" value="Like New"> Like New
</div>
</div>
<div class="form-group">
<label>Price</label>
<input type="number" class="form-control" name="price" required
placeholder="input whole dollar price">
</div>
<button type="submit" class="btn btn-primary btn-md" id="add-btn">
<span class="fa fa-fire"></span> Sell</button>
</form>
https://stackoverflow.com/questions/52175373
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