open new page based on combobox choice and click button

Question

i have combobox code like this

<form action="plot.php" method="POST">
    <select name="variabel">
        <option value="no2">NO2</option>
        <option value="so2">SO2</option>
        <option value="ozone">ozone</option>
        <option value="aerosol">aerosol</option>
    </select>
    <input type="submit" value="plot" style="width:500px;height:48px">

and in file named "plot.php" like this

<?php
  $variabel = $_POST['variabel'];

  if ($variabel = "no2") {
    header("location:maps_no2.php");
  } else if ($variabel = "so2") {
    header("location:maps_so2.php");
  } else if ($variabel = "ozone") {
    header("location:maps_ozone.php");
  } else {
    header("location:maps_aerosol.php");
  }
?>

all i want is when i pick one of the item in my combobox, it will be the parameter for the other page to open after i click "plot" button. for the example, when i pick NO2, maps_no2.php will show. when i try that code above, it just work on the first condition, although i pick so2. how can i solve this? anyone?? please.

you're doing assignments instead of comparisons. – Funk Forty Niner Oct 02 '15 at 16:07 — Funk Forty Niner, Oct 02 '15 at 16:07

durbnpoisn · Answer 1 · 2015-10-02T16:10:32.283

1

Here is your problem:

<?php
 if $variabel = $_POST['variabel'];

Should be

<?php
  if $variabel == $_POST['variabel'];

If you just use the single =, it SETS the variable to that value. Then it will always be true.

edited Oct 02 '15 at 16:10

answered Oct 02 '15 at 16:04

durbnpoisn

4,666
2
16
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thanks for answer but it still the same. it just want go to the first condition :( – kenry Oct 02 '15 at 16:08
I fixed my answer, as I forgot the IF part. Which is what I was referring to. – durbnpoisn Oct 02 '15 at 16:11

score 1 · Answer 2 · answered Oct 02 '15 at 16:05

1

You have to compare, in your statements you are assigning instead:

<?php
  $variabel = $_POST['variabel'];

  if ($variabel == "no2") {
  header("location:maps_no2.php");
  }
  else if ($variabel == "so2")
  {
  header("location:maps_so2.php");
  }
  else if ($variabel == "ozone")
  {
  header("location:maps_ozone.php");
  }
  else 
  {
  header("location:maps_aerosol.php");
  }
?>

answered Oct 02 '15 at 16:05

taxicala

21,408
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best to also add `exit;` after each header ;-) I think the OP isn't aware of that. – Funk Forty Niner Oct 02 '15 at 16:11
oh yes! thanks it works :) – kenry Oct 02 '15 at 16:12
okay fred thanks for tell me that :) – kenry Oct 02 '15 at 16:13
@nikenriyanti you're welcome. – Funk Forty Niner Oct 02 '15 at 16:17

score 0 · Answer 3 · answered Oct 02 '15 at 16:05

0

You should use == for comparisons

<?php
  $variabel = $_POST['variabel'];

  if ($variabel == "no2") {
    header("location:maps_no2.php");
  } else if ($variabel == "so2") {
    header("location:maps_so2.php");
  } else if ($variabel == "ozone") {
    header("location:maps_ozone.php");
  } else {
    header("location:maps_aerosol.php");
  }
?>

answered Oct 02 '15 at 16:05

Berriel

12,659
4
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oh yes! thanks it works :) – kenry Oct 02 '15 at 16:11

open new page based on combobox choice and click button

3 Answers3