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‎LICENSE.md

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‎README.md

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‎index.php

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>jquery-maxsubmit plugin demo</title>
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<meta name="Generator" content="EditPlus">
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<meta name="Author" content="Jason Judge">
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<meta name="Keywords" content="jquery forms get post http php">
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<meta name="Description" content="">
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<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
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<script type="text/javascript" src="jquery.maxsubmit.js"></script>
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<script type="text/javascript">
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jQuery(document).ready(function($) {
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$('form#form1').maxSubmit({
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max_count: 2,
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max_exceeded_message: "This form has too many fields.\n\n"
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+ " Found {form_count} fields, so with a maximum of {max_count} supported by the server, some data will be lost.\n\n"
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+ " You may continue and submit, or cancel."
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});
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});
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</script>
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</head>
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<?php
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$input = array(
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'text1' => 'Text 1',
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'text2' => 'Text 2',
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'checkbox1' => 'on',
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'checkbox2' => '',
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);
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foreach($input as $key => $value) {
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$input[$key] = (isset($_POST[$key]) ? $_POST[$key] : '' );
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}
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$input = array_merge(
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$input,
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array(
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'select1' =>
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array(
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'value1' => '',
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'value2' => '',
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'value3' => '',
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),
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)
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);
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if (!empty($_POST['select1'])) {
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foreach($_POST['select1'] as $key => $value) {
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$input['select1'][$value] = $value;
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}
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}
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/**
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* Get the submission limit.
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* Returns the lowest limit or false if no limit can be found.
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* An alternate default can be provided if required.
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* CHECKME: do we need to separate GET and POST limits, as they may apply
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* to different forms. The larger number of parameters is like to only
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* apply to POST forms, so POST is important. The REQUEST max vars is
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* another thing to consider, as it will be the sum of GET and POST parameters.
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*/
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function getFormSubmissionLimit($default = false)
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{
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// All these ini settings will affect the number of parameters that can be
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// processed. Check them all to find the lowest.
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$ini = array();
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$ini[] = ini_get('max_input_vars');
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$ini[] = ini_get('suhosin.get.max_vars');
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$ini[] = ini_get('suhosin.post.max_vars');
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$ini[] = ini_get('suhosin.request.max_vars');
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$ini = array_filter($ini, 'is_numeric');
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$lowest_limit = min($ini);
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return ($lowest_limit === false ? $default : $lowest_limit);
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}
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?>
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<body>
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<h1>Max Submit</h1>
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<p>
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The real server form submission parameter limit is <?php echo getFormSubmissionLimit('{not defined}'); ?>.
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For these tests, we will set the limit to 2, so the confirm message is always shown.
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</p>
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<form method="post" id="form1">
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<h2>Mandatory form items: will count as one submitted parameter each</h2>
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<p>
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<input type="text" name="text1" value="<?php echo $input['text1']; ?>" />
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</p>
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<p>
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<input type="text" name="text2" value="<?php echo $input['text2']; ?>" />
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</p>
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<p>
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<select name="select2">
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<option value="value1">Value 1</option>
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</select>
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</p>
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<p>
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<input type="radio" name="radio1" value="value1" checked />
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<input type="radio" name="radio1" value="value2" />
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<input type="radio" name="radio1" value="value3" />
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Radio 1
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</p>
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<p>
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<input type="radio" name="radio2" value="value1" checked />
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<input type="radio" name="radio2" value="value2" />
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<input type="radio" name="radio2" value="value3" />
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Radio 2
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</p>
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<hr />
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<h2>Optional form items: will count as zero, one or more parameters</h2>
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<p>
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<label><input type="checkbox" name="checkbox1" <?php echo ($input['checkbox1'] == 'on' ? 'checked="checked"' : ''); ?> /> Checkbox 1</label>
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</p>
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<p>
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<label><input type="checkbox" name="checkbox2" <?php echo ($input['checkbox2'] == 'on' ? 'checked="checked"' : ''); ?> /> Checkbox 2</label>
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</p>
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<p>
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<select name="select1[]" multiple="multiple">
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<?php foreach($input['select1'] as $key => $value) { ?>
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<option value="<?php echo "$key"; ?>" <?php echo ($value ? "selected='selected'" : "") ?>><?php echo $key; ?></option>
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<?php } ?>
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</select> (counts as up to three parameters)
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</p>
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<p>
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<input type="submit" value="Submit" /> (also a mandatory submitted parameter)
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</p>
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</form>
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</body>
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</html>

‎jquery.maxsubmit.js

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/**
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* Copyright 2013 Academe Computing Ltd
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* Released under the MIT license
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* Author: Jason Judge <[email protected]>
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*/
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/**
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* jquery.maxsubmit.js
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*
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* Checks how many parameters a form is going to submit, and
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* gives the user a chance to cancel if it exceeds a set number.
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* PHP5.3+ has limits set by default on the number of POST parameters
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* that will be accepted. Parameters beyond that number, usually 1000,
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* will be silently discarded. This can have nasty side-effects in some
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* applications, such as editiong shop products with many variations
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* against a product, which can result in well over 1000 submitted
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* parameters (looking at you WooCommerce). This aims to provide some
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* level of protection.
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*
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* TODO: we should look at GET variables on the form URL, because they also
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* get counted on the "suhosin.request.max_vars" setting, if used.
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*/
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(function($) {
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$.fn.maxSubmit = function(options) {
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// this.each() is the wrapper for each selected group of checkboxes.
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return this.each(function() {
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var settings = $.extend({
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// The maximum number of parameters the form will be allowed to submit
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// before the user is issued a confirm (OK/Cancel) dialogue.
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max_count: 1000,
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// The message given to the user to confirm they want to submit anyway.
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// Can use {max_count} as a placeholder for the permitted maximum
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// and {form_count} for the counted form items.
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max_exceeded_message: 'This form has too many fields for the server to accept.\n'
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+ ' Data may be lost if you submit. Are you sure you want to go ahead?',
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// The function that will display the confirm message.
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// Replace this with something fancy such as jquery.ui if you wish.
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confirm_display: function(form_count = '') {
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return confirm(
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settings
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.max_exceeded_message
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.replace("{max_count}", settings.max_count)
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.replace("{form_count}", form_count)
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);
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}
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}, options);
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// Form elements will be passed in, so we need to trigger on
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// an attempt to submit that form.
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// First check we do have a form.
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if ($(this).is("form")) {
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$(this).on('submit', function(e) {
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// We have a form, so count up the form items that will be
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// submitted to the server.
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// Text fields and submit buttons will all post one parameter.
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var form_count = $('input:text, input:submit, input:password, textarea', this).length;
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// Checkboxes will post only if checked.
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$('input:checkbox', this).each(function() {
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if (this.checked) form_count++;
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});
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// Single-select lists will always post one value.
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$('select:not([multiple])', this).each(function() {
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form_count++;
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});
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// Multi-select lists will post one parameter for each selected item.
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$('select[multiple]', this).each(function() {
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// The select item value is null if no options are selected.
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var select = $(this).val();
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if (select !== null) form_count += select.length;
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});
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// Each radio button group will post one parameter.
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// Count the radio groups
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var rgroups = [];
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$('input:radio').each(function(index, el) {
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var i;
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for(i = 0; i < rgroups.length; i++) {
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if (rgroups[i] == $(el).attr('name')) return;
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}
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rgroups.push($(el).attr('name'));
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});
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form_count += rgroups.length;
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if (form_count > settings.max_count) {
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// If the user cancels, then abort the form submit.
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if (!settings.confirm_display(form_count)) return false;
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}
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// Allow the submit to go ahead.
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return true;
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});
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}
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// Support chaining.
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return this;
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});
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};
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}(jQuery));
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