PHP Javascript keep value after submit

Question

How can I keep the value or data in the POST input textfield after submit? For example, if I want to show the user an error, but keeps his written text inside the input textfield? This is my javascript:

function myFunction()
{
var table = document.getElementById("produkter_rows");
var row = table.insertRow(-1);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var cell4 = row.insertCell(3);
var cell5 = row.insertCell(4);
cell1.innerHTML = '<td><input style="width:450px;" class="text-input" type="text" name="beskrivelse_ny[]" value=""></td>';
cell2.innerHTML = '<td><input style="width:60px;" class="text-input" type="text" name="enhed_ny[]" value=""></td>';
cell3.innerHTML = '<td><input style="width:30px;" class="text-input" type="text" name="stk_ny[]" value=""></td>';
cell4.innerHTML = '<td><input style="width:205px;" class="text-input" type="text" name="vejl_eks_moms_ny[]" value=""></td>';
cell5.innerHTML = '<td><a href="#" onclick="removeRow(this)" id="addNew" title="Slet produkt"><img src="images/icons/slet.gif" width="16" alt="Slet" /></a></td>';
}

What's happening on submit? Ajax-request - then no form values will be changed. Page refresh - use php sessions. — u_mulder
– u_mulder, Commented Feb 15, 2014 at 20:17
AJAXify the form, that way the form stays populated anyway - it's great! :D — Niet the Dark Absol
– Niet the Dark Absol, Commented Feb 15, 2014 at 20:19
@NiettheDarkAbsol how can I do that and still keep the same function :)? — dinkode.dk
– dinkode.dk, Commented Feb 15, 2014 at 20:22

Community · Accepted Answer · 2017-05-23 12:29:22Z

1

This should be handled in PHP instead of JavaScript. Values are output from the database in your question PHP MySQL Delete function in while loop. Now detect if the user has submitted a value for the same field and output that instead.

If the names of your database columns and user submitted fields map exactly you could do something like this:

$data = isset($_POST['data']) ? (array)$_POST['data'] : array();

while($mat = $materialer_query->fetch_object()) {
    // true when the user has submitted data for the current object
    if (array_key_exists($mat->id, $data)) {
        foreach ($data as $k => $v) {
            if (property_exists($mat, $k)) {
                // replace the database value with that submitted by the user
                $mat->$k = $v;
            }
        }
    }

    // ... the rest of your code to output the table row
}

edited May 23, 2017 at 12:29

CommunityBot

11 silver badge

answered Feb 15, 2014 at 20:49

Andrew Mackrodt

1,82614 silver badges10 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

PHP Javascript keep value after submit

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related