javascript - Submit a form from a link and get $_Post value -


i have following problem. have form containing several links. links should assign hidden field , submit form using javascript.

i'm using php 5.4.

when submit form using button, $_post containts data. when form submitter javascript, $_post empty.

any clue?

<head>    <script language="text/javascript">     function affect(nummet)     {         document.forms['frmdemo'].num_met_choose.value = nummet;         document.forms['frmdemo'].submit();     }     </script>  </head>  <body>   <?php    var_dump($_post);   ?>   <form name="frmdemo" enctype="multipart/form-data" method="post">    <input  name="num_met_choose" id="num_met_choose">    <a href="" onclick="javascript:affect('22');" >test 1</a>    <a href="" onclick="javascript:affect('12');" >test 2</a>    <button id="submit" type="submit">ok</button>  </form>

you have 2 problems.

the first this:

document.forms['frmdemo'].submit();

combined this:

<button id="submit" type="submit">ok</button>

by having form control id="submit" inside form, overwrite submit property of the form object. instead of being function can call, becomes reference element id submit.

you need use different id (or none @ since don't seem using anything).

you should have got error in browser's javascript console. keep , eye on when js isn't behaving expect.

even if fix that, have problem:

<a href="" onclick="javascript:affect('22');" >test 1</a>
  1. the javascript runs
  2. the form submit
  3. the link followed form isn't submitted after all

don't use link thing run js (unless want function link, or setting use link fallback).

use button (with type="button") instead.

that said. don't use javascript @ this. can same effect plain html.

 <form enctype="multipart/form-data" method="post">     <button type="submit" name="num_met_choose" value="22">test 1</button>     <button type="submit" name="num_met_choose" value="12">test 2</button>  </form>

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