Keep values selected after form submission – Even if we have a good project plan and a logical concept, we will spend the majority of our time correcting errors abaout and . Furthermore, our application can run without obvious errors with JavaScript, we must use various ways to ensure that everything is operating properly. In general, there are two types of errors that you’ll encounter while doing something wrong in code: Syntax Errors and Logic Errors. To make bug fixing easier, every JavaScript error is captured with a full stack trace and the specific line of source code marked. To assist you in resolving the JavaScript error, look at the discuss below to fix problem about Keep values selected after form submission.
Problem :
Consider:
<form method="get" action="">
<select name="name">
<option value="a">a</option>
<option value="b">b</option>
</select>
<select name="location">
<option value="x">x</option>
<option value="y">y</option>
</select>
<input type="submit" value="Submit" class="submit" />
</form>
On submitting the form, how do I make sure that the selected values remain selected in the dropdowns? This form is inside WordPress (PHP).
Solution :
To avoid many if-else structures, let JavaScript do the trick automatically:
<select name="name" id="name">
<option value="a">a</option>
<option value="b">b</option>
</select>
<script type="text/javascript">
document.getElementById('name').value = "<?php echo $_GET['name'];?>";
</script>
<select name="location" id="location">
<option value="x">x</option>
<option value="y">y</option>
</select>
<script type="text/javascript">
document.getElementById('location').value = "<?php echo $_GET['location'];?>";
</script>
<select name="name">
<option <?php if ($_GET['name'] == 'a') { ?>selected="true" <?php }; ?>value="a">a</option>
<option <?php if ($_GET['name'] == 'b') { ?>selected="true" <?php }; ?>value="b">b</option>
</select>
After trying all these “solutions”, nothing work. I did some research on W3Schools before and remember there was explanation of keeping values about radio.
But it also works for the Select option. See below for an example. Just try it out and play with it.
<?php
$example = $_POST["example"];
?>
<form method="post">
<select name="example">
<option <?php if (isset($example) && $example=="a") echo "selected";?>>a</option>
<option <?php if (isset($example) && $example=="b") echo "selected";?>>b</option>
<option <?php if (isset($example) && $example=="c") echo "selected";?>>c</option>
</select>
<input type="submit" name="submit" value="submit" />
</form>
If you are using WordPress (as is the case with the OP), you can use the selected function.
<form method="get" action="">
<select name="name">
<option value="a" <?php selected( isset($_POST['name']) ? $_POST['name'] : '', 'a' ); ?>>a</option>
<option value="b" <?php selected( isset($_POST['name']) ? $_POST['name'] : '', 'b' ); ?>>b</option>
</select>
<select name="location">
<option value="x" <?php selected( isset($_POST['location']) ? $_POST['location'] : '', 'x' ); ?>>x</option>
<option value="y" <?php selected( isset($_POST['location']) ? $_POST['location'] : '', 'y' ); ?>>y</option>
</select>
<input type="submit" value="Submit" class="submit" />
</form>
Since WordPress already uses jQuery you can try something like this:
var POST=<?php echo json_encode($_POST); ?>;
for(k in POST){
$("#"+k).val(POST[k]);
}
JavaScript only solution:
var tmpParams = decodeURIComponent(window.location.search.substr(1)).split("&");
for (var i = 0; i < tmpParams.length; i++) {
var tmparr = tmpParams[i].split("=");
var tmp = document.getElementsByName(tmparr[0])[0];
if (!!tmp){
document.getElementsByName(tmparr[0])[0].value = tmparr[1];
}
}
Or if you are using jQuery you can replace
var tmp = document.getElementsByName(tmparr[0])[0];
if (!!tmp){
document.getElementsByName(tmparr[0])[0].value = tmparr[1];
}
with:
$('*[name="'+tmparr[0]+'"]').val(tmparr[1]);
Try this solution for keep selected value in dropdown:
<form action="<?php echo get_page_link(); ?>" method="post">
<select name="<?php echo $field_key['key']; ?>" onchange="javascript:
submit()">
<option value="">All Category</option>
<?php
foreach( $field['choices'] as $key => $value ){
if($post_key==$key){ ?>
<option value="<?php echo $key; ?>" selected><?php echo $value; ?></option>
<?php
}else{?>
<option value="<?php echo $key; ?>"><?php echo $value; ?></option>
<?php }
}?>
</select>
</form>
This works for me!
<label for="reason">Reason:</label>
<select name="reason" size="1" id="name" >
<option value="NG" selected="SELECTED"><?php if (!(strcmp("NG", $_POST["reason"]))) {echo "selected="selected""""
} ?>
Selection a reason below<
/option>