我在jsp中有一个表单,我的输入字段也是“必需的”但是当我提交表单时,如果必填字段为空,它不会阻止提交。我不明白,请提前帮助谢谢。这是我的jsp表格:
<form id="addterminal" name="catForm" action="actions/Terminal.jsp" method="post" enctype="multipart/form-data">
<fieldset>
<label>Add Terminal</label>
<% String action = request.getParameter("action");
if(action == null)
{
}
else if(action.equals("add_success"))
{
%>
<div class="alert success">Terminal added Successfully...</div>
<%
}
else if(action.equals("add_failure"))
{
%>
<div class="alert failure">Terminals not added,File Format is incorrect...</div>
<%
}
%>
<section>
<label for="input">Terminal ID</label>
<div>
<input type="text" id="input" name="tid" required>
</div>
</section>
<section>
<label for="input">Merchant Name</label>
<div>
<input type="text" id="input" name="merchName" required>
</div>
</section>
<section>
<label for="file_upload">Upload Bulk Terminals File<br>
<span>Format of the File should be .csv</span></label>
<div>
<input type="file" id="file_upload" name="termbulkfile">
</div>
</section>
<section>
<div>
<!-- <button onclick="javascript:document.catForm.reset()">Reset</button>
--> <button onclick="javascript:document.catForm.submit()">Submit</button>
</div>
</section>
</fieldset>
</form>
答案 0 :(得分:1)
您可以使用java脚本来实现此目标
<script>
function validation() {
var x = document.forms["myform"]["username"].value;
if (x == null || x == "") {
alert("username cannot be empty..!!");
return false;
}
</script>
创建一个这样的表单:
<form name="myform" action="**wherever you want to redirect**" onsubmit="return validation()">
<input type="text" name="username">
<input type="submit">
</form>
答案 1 :(得分:0)
试试这个:
if(action.length!=0)
{
...
}