php cannot get value from html

Question

I have questions that why my html file cannot connect with php file.

But I am sure that after I click the submit button, value of <input type="hidden" id="t1_response" name="t1_response" value=""> can be given.

However, url doesn't change to php form(like tocsv.php?t1_response=...).

And php gives me an notice:

Notice: Undefined index: t1_response in C:\xampp\htdocs\colors\tocsv.php on line 2

How can I fix it?

<script>
...
function pressSubmit() {
    $('#startTrial').hide();

    for (var i = 1; i <=3; i++) {
        rt = rt + parseFloat(document.getElementById("t"+i+"_rt").value);
    };
    if (document.getElementById("t1_response").value === "diff") {acc=acc+1};
    if (document.getElementById("t2_response").value === "diff") {acc=acc+1};
    if (document.getElementById("t3_response").value === "same") {acc=acc+1};


    document.write("<div>The average react time: " + rt/3 +" ms</div>");
    document.write("<div>Acc Rate:" + acc/3*100+"%</div>");


}

</script>

<style>
...
</style>


<!DOCTYPE html>
<html>
<body>
<h3>Remember the colors</h3>


Press 's' if the two displays are the same. Press 'd' if a color changed (different).<br>

<form action="tocsv.php" method="get">
<input type="hidden" id="t1_response" name="t1_response" value="">
<input type="hidden" id="t1_rt" name="t1_rt" value="">

<input type="submit" id="submitButton" name="submitButton" onclick="javascript:pressSubmit()">
</form>
</body>
</html>

pressSubmit() contains calculating average number and document.write() to display the value to user.

tocsv.php

<?php 
echo $_GET["t1_response"];
?>

Answer 1

Error code is clear: you have to define the var t1_response in your php file. I bet you write:

t1_response = $_POST['t1_response ']

but you need:

$t1_response = $_POST['t1_response ']

The html file you post here is ok.

Answer 2

I have solved the problems.

Thanks everyone's help.

Here, in pressSubmit() , I wrote doucument.write(...) , which make the page to be overwritten. Thus, it came out to be unable to get the value and I have no idea why so.

Thus, I use alert to avoid to overwrite the page. And everything works.

Thanks everyone's help again!

.

php cannot get value from html

Question

2 answers

solution1
0 2020-04-24 19:56:59

solution2
0 ACCPTED 2020-04-25 17:00:29

php cannot get value from html

Question

2 answers

solution1 0 2020-04-24 19:56:59

solution2 0 ACCPTED 2020-04-25 17:00:29

solution1
0 2020-04-24 19:56:59

solution2
0 ACCPTED 2020-04-25 17:00:29