javascript - Failure to display result of a php script calculation in the textarea box -


i believe problem may lie in way trying initialize script. submit button using seems clear form, , not display results. think there may problem 2 lines " $message = $_post['textarea'];" , "echo $result + $message;" not sure if correct way produce result text area box, display miles driven , total cost in separate text boxes. want 1 button 3 tasks. there way efficiently php?

edit: corrected version of code. thank @fred-ii-!

<?php     if(isset($_post['submit'])) {     $x = $_post['beginningodometerreading'];     $y = $_post['endingodometerreading'];     $z = $_post['daysrentedcar'];     $miles = $y - $x;      $result = (15 * $z) + ($miles * 0.12);     $message = $_post['textarea'];   echo $result + $message; }  ?> <html> <head> </script> </head> <body> <div align="center"> <hr><br> <form action="index4.php" method="post" name id="main"> <input type="text" id="name" name="customername" placeholder="enter name here" size="30px">    <br><br> <input type="text" id="address" name="customeraddress" placeholder="enter street address here" size="50px">    <br><br> <input type="text" id="city" name="customercity" placeholder="what city live in?" size="30px">    <br><br> <input type="number" id="zip" name="customerzip" placeholder="enter zip code" size="30px">    <br><br> <input type="number" id="bodometer" name="beginningodometerreading" placeholder="start odometer reading" size="80px">    <br><br> <input type="number" id="eodometer" name="endingodometerreading" placeholder="end odometer reading" width="80px">  <br><br> <input type="number" id="daysrented" name="daysrentedcar" placeholder="days rented" size="50px">   <br><br>  <input type="submit" id="submit" value="submit"/> <br><br> miles driven: <input type="number" id='miles' min="1" max"10000" readonly="" /> total cost: <input type="number" id='result' min="1" max"10000" readonly="" /> <br><br> summary: <textarea cols="30" rows="2" name="thetextarea" id="textarea">     </textarea> <br><br> <input type="reset" value="reset"> </form>        <hr> </div> </body>

there few things wrong here.

one of problems being conditional statement:

if(isset($_post['submit'])) {

it looking named element called "submit" submit button not named.

<input type="submit" id="submit" value="submit"/>

name it:

<input type="submit" name="submit" id="submit" value="submit"/>

and might have been relying on "id" it. in instance, can't.

that why you're getting blank page.

having used else{ echo "error"; } have echo'd "error".

for example:

<?php     if(isset($_post['submit'])) {     $x = $_post['beginningodometerreading'];     $y = $_post['endingodometerreading'];     $z = $_post['daysrentedcar'];     $miles = $y - $x;      $result = (15 * $z) + ($miles * 0.12);     $message = $_post['textarea'];   echo $result + $message; }     else { echo "error"; } ?>

then have

$message = $_post['textarea'];

but textarea named name="thetextarea".

  • both of need match in names.

you using wrong concatenate operator + for

echo $result + $message;

that needs dot. + sign js/c++ method of concatenation, if 1 of variables contains string.

echo $result . $message;

or

echo $result . " ". $message;

had been mathematical equation 2 variables, yes; have been valid operator, not in case, since trying echo $message variable, "textarea", being "text" , not integer.

sidenote: ensure indeed passing integer post array, add (int) it. example: $x = (int)$_post['beginningodometerreading'];

edit: found few more errors in form.

you have 2x instances of max"10000" it's missing equal sign max="10000"

and might missing name attributes both of these (which outlined missing = signs max"10000".

miles driven: <input type="number" id='miles' min="1" max"10000" readonly="" /> total cost: <input type="number" id='result' min="1" max"10000" readonly="" />

  • if you're relying on js tagged as, please edit question , add code. however, there no code in php support this.

  • you've syntax error in <form> being name id="main"

  • you need adjust actual code accordingly.

rewrite:

<?php     if(isset($_post['submit'])) {     $x = $_post['beginningodometerreading'];     $y = $_post['endingodometerreading'];     $z = $_post['daysrentedcar'];     $miles = $y - $x;      $result = (15 * $z) + ($miles * 0.12);     $message = $_post['thetextarea'];   echo $result . " " . $message; }     else { echo "error"; } ?>

error reporting have signaled undefined index notice both of those.

add error reporting top of file(s) find errors.

<?php  error_reporting(e_all); ini_set('display_errors', 1);  // rest of code

sidenote: error reporting should done in staging, , never production.


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