表单会在提交时进行验证，如果可以，您可以添加新值，修改现有值或删除。但是，删除会被验证中断。第一部分验证检查是newName选择中是否已存在readName。第二部分是为了确保文本框不是空白。 newName根据readName选项填充<form action="lists" method="post" onsubmit="return validate(this)">
<selects id="readName" name="readName" onchange="updateAction(this.form, 'read');this.form.submit()">
<option title="PETER" value="PETER">PETER</option>
<option selected title="Will" value="Will">Will</option>
<option title="one" value="one">one</option>
</select>
<label class="padLeft15">Edit Name:</label>
<input type="text" name="newName" id="newName" title="Will" value="Will" />
<input class="marginRight10" id="new" type="submit" onclick="updateAction(this.form, 'new');" value="New" />
<input class="marginRight10" id="save" type="submit" onclick="updateAction(this.form, 'save')" value="Save" />
<input class="marginRight10" id="delete" type="submit" onclick="updateAction(this.form, 'delete')" value="Delete" />
</form>
<script>
function validate(form) {
var isValid = validateText(form.newName);
var exists= $("#readName option[value='"+ $("#newName").val()+"']").length > 0;
if (exists) {
document.getElementById("error").innerHTML = "WHOAA, already have this in the list!!";
return false;
}
if (!isValid) {
document.getElementById("error").innerHTML = "Name must not be empty";
return false;
}
return isValid;
}
</script>
。在删除验证投诉时，因为您提交的是存在于下拉列表中的值。如何删除旁路验证？
express答案 0 :(得分：0)
将删除按钮更改为按钮类型，以便不提交。然后通过手动传递数据来覆盖单击操作。
<input class="marginRight10" id="delete" type="button" onclick="updateAction(this.form, 'delete')" value="Delete" />
$('body').on('click', '#delete', function () {
updateAction('#yourformid', 'delete')
});