How do we dynamically display the sum of all the values of check boxes that have been checked in php.
Its basically like a checkout in a shopping cart.Each item that is to be checked, has a value and the final amount(in the same page at the bottom) should be the sum of rates of all the items that have been checked(without refreshing).
I may need to use AJAX. Can anyone give a simple sample code please
For the checkboxes, you need to make them into an array, say for instance:
<input type="checkbox" name="items[]" id="items[]" value="25" /><br />
<input type="checkbox" name="items[]" id="items[]" value="40" /><br />
<input type="checkbox" name="items[]" id="items[]" value="12" /><br />
... <!-- as many as you want -->
<input type="checkbox" name="items[]" id="items[]" value="20" /><br />
On the PHP side you could then handle it like so...(NOTE: It will come into PHP as an array)
$items = $_POST["items"];
//it's an array -- feel free to do a var_dump($items) to see its content
//to sum you could even do an $total_amount = array_sum($items);
//but i would advise cleaning up the values first
And yes, you can achieve the same if you submit the form using AJAX (e.g. via jQuery)
Happy coding :)
Related
Im trying to create a form using PHP and I cant seem to find a tutorial on what I need so thought Id ask on here.
I have a multiple checkbox option on my page...
<li>
<label>What service are you enquiring about?</label>
<input type="checkbox" value="Static guarding" name="service">Static guarding<br>
<input type="checkbox" value="Mobile Patrols" name="service">Mobile Patrols<br>
<input type="checkbox" value="Alarm response escorting" name="service">Alarm response escorting<br>
<input type="checkbox" value="Alarm response/ Keyholding" name="service">Alarm response/ Keyholding<br>
<input type="checkbox" value="Other" name="service">Other<input type="hidden" value="Other" name="service"></span>
</li>
I'm not sure however how to collect all checkbox values using POST method?
if i use
$service = $_POST['service'];
I only get 'other' returned
Name the fields like service[] instead of service, then you'll be able to access it as array. After that, you can apply regular functions to arrays:
Check if a certain value was selected:
if (in_array("Other", $_POST['service'])) { /* Other was selected */}
Get a single newline-separated string with all selected options:
echo implode("\n", $_POST['service']);
Loop through all selected checkboxes:
foreach ($_POST['service'] as $service) {
echo "You selected: $service <br>";
}
Currently it's just catching your last hidden input. Why do you have that hidden input there at all? If you want to gather information if the "Other" box is checked, then you have to hide the
<input type="text" name="other" style="display:none;"/>
and you can show it with javascript when the "Other" box is checked. Something like that.
Just make the name attribute service[]
<li>
<label>What service are you enquiring about?</label>
<input type="checkbox" value="Static guarding" name="service[]">Static guarding<br />
<input type="checkbox" value="Mobile Patrols" name="service[]">Mobile Patrols<br />
<input type="checkbox" value="Alarm response escorting" name="service[]">Alarm response escorting<br />
<input type="checkbox" value="Alarm response/ Keyholding" name="service[]">Alarm response/ Keyholding<br />
<input type="checkbox" value="Other" name="service[]">Other</span>
</li>
Then in your PHP you can access it like so
$service = $_POST['service'];
echo $service[0]; // Output will be the value of the first selected checkbox
echo $service[1]; // Output will be the value of the second selected checkbox
print_r($service); //Output will be an array of values of the selected checkboxes
etc...
<input type="checkbox" value="Other" name="service">Other<input type="hidden" value="Other" name="service"></span>
You've got a hidden input field with the same name as the checkbox. "later" fields with the same name as an earlier one will overwrite the previous field's values. This means that your form, as posted above, will ALWAYS submit service=Other.
Given the phrasing of your question in the html, it sounds more like you'd want a radio button, which allows only ONE of a group of same-name fields to be selected. Checkboxes are an "AND" situation, radio buttons correspond to "OR"
I having around 20 check boxes in my form as
<input type="checkbox" name="c1" value="1" />
<input type="checkbox" name="c2" value="2" />
<input type="checkbox" name="c3" value="3" />
<input type="checkbox" name="c4" value="4" />
i would like to these values to a database. I just thought rather than creating 20 fields in my database grab all the values at store in the db as 1,2,3,4 and then when querying to explode the values and display it accordingly using php.
can someone please tell me how am i supposed to concatenate the values 1,2,3,4 from the check fields when submitted so i can pass to the database.
i would appreciate if anyone can suggest a different effective way to achieve this using php.
You can change the name of the checkboxes to be the same, something like
<input type="checkbox" name="cb[]" value="1" />
<input type="checkbox" name="cb[]" value="2" />
Then access them via $_GET or $_POST via
if (isset($_POST['cb'])) {
$my_values = implode(",", $_POST['cb']);
}
If you want them sorted, then you will want to do something like this:
if (isset($_POST['cb'])) {
$my_values = $_POST['cb'];
sort($my_values);
$my_db_value = implode(',', $my_values);
}
For the record, I agree with #Shef in the case that the database can handle the extra load. Depending on when this information will be needed in a highly scalable solution, however, this is a perfectly acceptable way to handle this.
To answer your initial question, first off you need to name your checkboxes all the same name, so:
<input type="checkbox" name="box[]" value="1" />
....
<input type="checkbox" name="box[]" value="20" />
PHP script:
$boxes = $_POST['box'];
$values = implode(",", $boxes); // $values now has "1,2,3,4...", insert into table
A better way would be to have a separate table (see #Shef 's comment).
I have a form that is displaying data that is pulled from a database. There are several columns that are being pulled for the form. The basic structure of the form looks like this:
<form>
<input type="checkbox" name="check" value="$value" checked="$valueCheck" /> $label - $editedBy # $editedDate
<input type="checkbox" name="check" value="$value" checked="$valueCheck" /> $label - $editedBy # $editedDate
<input type="checkbox" name="check" value="$value" checked="$valueCheck" /> $label - $editedBy # $editedDate
<input type="checkbox" name="check" value="$value" checked="$valueCheck" /> $label - $editedBy # $editedDate
<input type="checkbox" name="check" value="$value" checked="$valueCheck" /> $label - $editedBy # $editedDate
<input type="submit" name="update" value="Update Checklist" />
</form>
The variables are all populated dynamically when the pages loads from data in the database. Here is my question...each input and corresponding data is being pulled from a single row in a "checklist" table. So, in the example above you would be looking at data from 5 rows in the database. When i check off a box and click submit i want it to submit that checked box to the database as a value of true or false depending on whether or not the box is checked or unchecked. I know how to do all that if i was only submitting one row; however, i am not sure how to do this with the multiple rows. I'm assuming i'll have to use some type of loop with my UPDATE query.
What would be the best way to accomplish this? Thanks for any help! Let me know if you have any questions at all. Sorry if doesn't explain my situation well enough.
Check out this page, particularly the bits following "UPDATE ===".
Haven't tried it but apparently, you can use a CASE statement in an update query.
Should work for your case.
Sounds like a bad idea maintenance-wise though (imho)
I'm building a form with the possibility to add more group of fields, to process them i read out the array in a for loop
the script:
<?php
foreach ($_POST as $key => $value) {
$$key = $value;
}
$count = count($name);
for ($i=0; $i<$count; $i++){
?>
<strong><?php echo $name[$i]; ?></strong> (<?php echo $check[$i]; ?>)<br /><?php echo $select[$i]; ?><br /><br />
<?php
}
?>
<form method="post">
<div class="group">
<input type="text" name="name[]" /><br />
<input type="checkbox" name="check[]" value="true" /><br />
<select name="select[]"><option>1</option><option>2</option><option>3</option></select>
</div>
<div class="group">
<input type="text" name="name[]" /><br />
<input type="checkbox" name="check[]" value="true" /><br />
<select name="select[]"><option>1</option><option>2</option><option>3</option></select>
</div>
<div class="group">
<input type="text" name="name[]" /><br />
<input type="checkbox" name="check[]" value="true" /><br />
<select name="select[]"><option>1</option><option>2</option><option>3</option></select>
</div>
<button>Add another group</button>
<input type="submit" />
</form>
If all checkboxes are checked there is no problem but if only the last one is checked it counts only one checkbox in the array, name[0] is then combined with check[0] but check[0] is really check[2]. English is not my native language so i don't know the right words.
Actually, there is a decent workaround for this as proposed by Sam in this answer on Stack Overflow:
Post the checkboxes that are unchecked
It worked for me, and I suspect you and I had a similar problem (mine being that I had/have upwards of 300 input fields in similar(ish) groups and didn't want to write validation rules for every one of those individual fields, just rules targetted at each family of input types e.g. the email addresses, or the postcodes. In brief, the technique is that you place a hidden input field, with the same name, before your checkbox field. Setting the value of the hidden field (type='hidden') to '0' will ensure that at least one key/value appears in your POST array, with the '0' being superceded by a later '1' only if the box is checked. I needed the '0' value to allow people to 'unset' an option they had previously 'set', for example that they were willing to show their contact data. This technique allows me to present the user with much the same form for an update as they would get at at first registration. Thanks to Sam!
That's normal PHP behaviour, when a checkbox is not checked it does not includes it in $_POST variable ...
Yes. That's how it is. There is no workaround for this. Using field[] identifiers is only applicable for unstructured input fields. If you depend on the ordering and relation, then unset fields will prevent this from working.
You have no other option but to set explicit indexes. You should bite into the sour apple and do so for name[0], check[1] and select[2]. Use a PHP loop to simplify it:
foreach (range(0,2) as $i)
echo <<< END
<div class="group">
<input type="text" name="name[$i]" /><br />
<input type="checkbox" name="check[$i]" value="true" /><br />
<select name="select[$i]"><option>1</option><option>2</option><option>3</option></select>
</div>
END
I was having the same exact problem with some parts of a form that can be add on user's wish. I came to this really simple workaround using basic javascript:
Add a hidden type input just after your checkbox, assign its value to the state of the checkbox and it's this hidden input that will be reported in your $_POST, will be true or false.
<input type="checkbox" onchange="this.nextSibling.value = this.checked">
<input type="hidden" name="state[]" value="false">
Just change value to true if your checkbox is checked="checked" by default.
I have a form that has a series of check boxes and some line items have a text input next to them that defines quantity of the item.
<input type="checkbox" name="measure[][input]" value="<?=$item->id?>">
<input class="item_mult" type="text" name="measure[][input]" />
What is the best way to capture the integer from the input field and have it correspond to the check box so I can use it to calculate the total later on?
<input type="checkbox" name="measure[<?php echo $item->id; ?>][checked]" value="<?php echo $item->id; ?>">
<input class="item_mult" type="text" name="measure[<?php echo $item->id; ?>][input]" />
That should give the values $measure[1]['checked'] (only present if checked) and $measure[1]['input']
I corrected your short tags - they're a bad idea, as they are disabled in php by default so can cause issues if you move servers
You can give your array a name/id to associate them, just add it into the name attribute:
<input type="checkbox" name="measure[1][my_checkbox]" value="<?=$item->id?>">
<input class="item_mult" type="text" name="measure[1][my_text]" />