标记向 showMessage.jsp 提交 POST 表单?" /> 标记向 showMessage.jsp 提交 POST 表单?"> 标记向 showMessage.jsp 提交 POST 表单?" />
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How can I submit a POST form using the <a href="..."> tag?

How can I submit a POST form to showMessage.jsp using just the <a href="..."> tag?

<form action="showMessage.jsp" method="post">
    <a href="showMessage.jsp"><%=n%></a>
    <input type="hidden" name="mess" value=<%=n%>/>
</form>
possible duplicate of Submit form using a link on JSP

r
rybo111

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;
}

Because your "method" does not use an a tag.
All well and good, but you've still chosen to answer a different question than was asked. And given that erasable ink is, in fact, a viable product produced on an industrial scale...
FWIW, I sympathize with your answer and it's what I personally would rather see in web apps I have to maintain. I'm just explaining the downvote - which I didn't leave, by the way. ;)
class="btn btn-link" for bootstrap
Worked perfectly for my needs!
P
Piotr Nowicki

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>

佚名

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>

form element need not necessarily be always the parentNode of the anchor tag.
A
Alexey Shevelyov

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.


L
Laid

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.


Are you sure IE8 does that? Just tried <button value="Bad">Good</button> in IE7 and it displays "Good".
S
Sinus the Tentacular

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 = $("

").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] $form.append($("").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 ") }) click me


I
Inarus Lynx

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.