如何使用 < a href = “ ...”> 标记提交 POST 表单？

You need to use javascript for this.

<form id="form1" action="showMessage.jsp" method="post">
<a href="javascript:;" onclick="document.getElementById('form1').submit();"><%=n%></a>
<input type="hidden" name="mess" value=<%=n%>/>
</form>

You have to use Javascript submit function on your form object. Take a look in other functions.

<form action="showMessage.jsp" method="post">
<a href="javascript:;" onclick="parentNode.submit();"><%=n%></a>
<input type="hidden" name="mess" value=<%=n%>/>
</form>

No JavaScript needed if you use a button instead:

<form action="your_url" method="post">
<button type="submit" name="your_name" value="your_value" class="btn-link">Go</button>
</form>

You can style a button to look like a link, for example:

.btn-link {
border: none;
outline: none;
background: none;
cursor: pointer;
color: #0000EE;
padding: 0;
text-decoration: underline;
font-family: inherit;
font-size: inherit;
}

There really seems no way for fooling the <a href= .. into a POST method. However, given that you have access to CSS of a page, this can be substituted by using a form instead.

Unfortunately, the obvious way of just styling the button in CSS as an anchor tag, is not cross-browser compatible, since different browsers treat <button value= ... differently.

Incorrect:


<form action='actbusy.php' method='post'>
<button type='submit' name='parameter' value='One'>Two</button>
</form>

The above example will be showing 'Two' and transmit 'parameter:One' in FireFox, while it will show 'One' and transmit also 'parameter:One' in IE8.

The way around is to use hidden input field(s) for delivering data and the button just for submitting it.

<form action='actbusy.php' method='post'>
<input class=hidden name='parameter' value='blaah'>
<button type='submit' name='delete' value='Delete'>Delete</button>
</form>

Note, that this method has a side effect that besides 'parameter:blaah' it will also deliver 'delete:Delete' as surplus parameters in POST.

You want to keep for a button the value attribute and button label between tags both the same ('Delete' on this case), since (as stated above) some browsers will display one and some display another as a button label.

In case you use MVC to accomplish it - you will have to do something like this

 <form action="/ControllerName/ActionName" method="post">
<a href="javascript:;" onclick="parentNode.submit();"><%=n%></a>
<input type="hidden" name="mess" value=<%=n%>/>
</form>

I just went through some examples here and did not see the MVC one figured it won't hurt to post it.

Then on your Action in the Controller I would just put <HTTPPost> On the top of it. I believe if you don't have <HTTPGET> on the top of it it would still work but explicitly putting it there feels a bit safer.

I use a jQuery script to create "shadow" forms for my POSTable links.

Instead of <a href="/some/action?foo=bar">, I write <a data-post="/some/action" data-var-foo="bar" href="#do_action_foo_bar">. The script makes a hidden form with hidden inputs, and submits it when the link is clicked.

$("a[data-post]")
.each(function() {
let href = $(this).data("post"); if (!href) return;
let $form = $("<form></form>").attr({ method:"POST",action:href }).css("display","none")
let data = $(this).data()
for (let dat in data) {
if (dat.startsWith("postVar")) {
let varname = dat.substring(7).toLowerCase()  // postVarId -> id
let varval = data[dat]
$form.append($("<input/>").attr({ type:"hidden",name:varname,value:varval }))
}
}
$("body").append($form)
$(this).data("postform",$form)
})
.click(function(ev) {
ev.preventDefault()
if ($(this).data("postform")) $(this).data("postform").submit(); else console.error("No .postform set in <a data-post>")
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a data-post="/some/action" data-var-foo="bar" href="#do_action_foo_bar">click me</a>

A good method for overriding the http functions, if you are using express/node.js, is to use the npm package method-override. Method-override example.