I'm trying to update individually loaded .json files according to whichever option in the <select> is chosen. It loads the .json file and then updates an individual file fine as long as I define $myFile as a specific .json file such as $myFile = "data/data.json";
But when I attempt to pass the select option as the filename, nothing saves. Where am I messing this up?
Here is the HTML select:
<form action="/server/php/data/process.php" method="post"> <select class="ui mini fluid search dropdown" id="templateSelection" type="text" name="selectTemplate" onchange="loadTemplate()"> <option value="" selected="selected">Select Template</option> <?php foreach(glob(dirname(__FILE__) . '/server/php/data/*') as $filename){ $filename = basename($filename); echo "<option value='" . $filename . "'>".$filename."</option>"; } ?> </select> </form> Here are the options that get populated:
<option value="data.json">data.json</option> <option value="data2.json">data2.json</option> <option value="data3.json">data3.json</option> And here is process.php:
<?php //$myFile = "data/data.json"; $filename = $_POST['selectTemplate']; $myFile = "data/" . $filename; $arr_data = array(); // create empty array try { //Get form data $formdata = array( 'ID'=> $_POST['ID'], 'attributeName'=> $_POST['attributeName'], 'valueX'=> $_POST['valueX'] ); //Get data from existing json file $jsondata = file_get_contents($myFile); // converts json data into array $arr_data = json_decode($jsondata, true); $updateKey = null; foreach ($arr_data as $k => $v) { if ($v['ID'] == $formdata['ID']) { $updateKey = $k; } } if ($updateKey === null) { array_push($arr_data,$formdata); } else { $arr_data[$updateKey] = $formdata; } $jsondata = json_encode($arr_data); //write json data into data.json file if(file_put_contents($myFile, $jsondata)) { echo 'Data successfully saved'; } else echo "error"; } catch (Exception $e) { echo 'Caught exception: ', $e->getMessage(), "\n"; } ?> EDIT: I'm submitting it (with a submit button) via another form on the same page with the same action. This other form allows me to change some of the values of the json that is loaded when an option in the first form is selected. Here is what this second form looks like:
<form class="ui form" action="server/php/process.php" method="POST" target="frame"> .... <input type="submit" value="Save"> </form>
Perhaps that is where the issue is coming from? I figured a submit on this 2nd form would pick up the selected option in the first form and store the option in a variable.
4 Answers
Answers 1
Try adding the submit button within the parent form of your select element (and remove the onchange handler for debugging).
As you wrote: "EDIT: I'm submitting it (with a submit button) via another form on the same page".
HTML-forms can not be nested and a submit button submits only the direct parent form (unless you use some javascript magic).
Note: In case you really want to submit the fields of 2 forms, have a look here:
Answers 2
When submitting HTML forms, browsers only post fields within the <form></form> tags.
Easy solution is to make all the fields under one form, or you can use Javascript to populate a hidden field on the actual form you are submitting.
Answers 3
The easiest way to debug it would be this:
var_dump($_POST); $filename = $_POST['selectTemplate']; var_dump($filename); $myFile = "data/" . $filename; var_dump($myFile); $arr_data = array(); // create empty array If it's the case that everything works when you hardcode $myFile = 'data/data.json - most probably one of those vars are not holding what you would expect them to hold.
Answers 4
I understand, your actual HTML-Code looks something like this:
<form class="ui form" action="server/php/process.php" method="POST" target="frame"> <form action="server/php/process.php" method="get"> <select class="ui mini fluid search dropdown" id="templateSelection" type="text" name="selectTemplate" onchange="loadTemplate()"> <option value="" selected="selected">Select Template</option> <option value="data.json">data.json</option> <option value="data2.json">data2.json</option> <option value="data3.json">data3.json</option> </select> </form> <input type="submit" value="Save"> </form> When you set the method='get' you can probably see, that your submit-button doesn't do anything. And here's why: Nested forms are not allowed in HTML. If you look at something like the Firefox-Inspector, you can how the browser is handling the exact same code:
As you can see, the browser removes the start of your inner <form>-tag and the end of your outer <form>-tag. In the result, your submit-button is outside of the form and is therefore useless.
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