我正试图使用我的表单，根据您从下拉表单（country_show）中选择的选项，将我的PHP变量$country_code覆盖到CA、US或EU。我在我的网站上使用Cloudflare，所以
$country_code = $_SERVER["HTTP_CF_IPCOUNTRY"];
对我很有用。我学习PHP和HTML才几周，对javascript一无所知。下面的脚本是一个基本的隐藏div函数，可以在网上找到。如果有人对如何使用下拉菜单覆盖$country_code变量有任何建议，请告诉我。我在HTML和PHP方面的知识非常有限。
<?php
$country_code = $_SERVER["HTTP_CF_IPCOUNTRY"];
?>
<script>
function showhide()
{
var div = document.getElementById("country_show");
if (div.style.display !== "none") {
div.style.display = "none";
}
else {
div.style.display = "block";
}
}
</script>
<div id="country_show">
<?php
if ($country_code == "CA") {
$message = "We have set your delivery country to Canada. If this is incorrect, please select your country";
}
elseif ($country_code == "US") {
$message = "We have set your delivery country to United States. If this is incorrect, please select your country";
}
else {
$message = "We have set your shipping charges to International. If this is incorrect, please select your country";
}
echo $message
?>
<form id="country_show">
<select>
<option value="">Choose location</option>
<option>Canada</option>
<option>United States</option>
<option>International</option>
</select>
</form>
<button id="button" onclick="showhide()">Hide</button>
</div>
我的例子应该会引导您朝着正确的方向前进：
我现在没有云火炬访问来测试它是否正常，但它应该正常。而且你必须注意，这只会起作用一次。当用户重新加载页面时，counry代码将被设置回由cloudflare或默认值提供。如果它应该是持久的，那么您应该使用会话来保存该信息，并在随后的页面加载中读取它。
<?php
$allowedCountryCodes = array(
'CA',
'US',
'INTERNATIONAL',
);
// load country code based on IP
if(empty($_SERVER["HTTP_CF_IPCOUNTRY"]) === true) {
// cloud flare do not provided country code, set default
$countryCode = 'INTERNATIONAL';
} else {
$countryCode = $_SERVER["HTTP_CF_IPCOUNTRY"];
}
// set country code based on user input
if($_POST && empty($_POST['country_code']) === false && in_array($_POST['country_code'], $allowedCountryCodes)) {
$countryCode = $_POST['country_code'];
}
?>
<div id="country_select">
<?php
if ($countryCode == "CA") {
$message = "We have set your delivery country to Canada. If this is incorrect, please select your country";
} elseif ($countryCode == "US") {
$message = "We have set your delivery country to United States. If this is incorrect, please select your country";
} else {
$message = "We have set your shipping charges to International. If this is incorrect, please select your country";
}
echo $message
?>
<form id="country_select_form" method="post">
<select id="country_select" name="country_code">
<option value="">Choose location</option>
<option value="CA">Canada</option>
<option value="US">United States</option>
<option value="INTERNATIONAL">International</option>
</select>
</form>
<button id="country_select_hide_button">Hide</button>
</div>
<script>
// init modular pattern
var app = {};
app.selectCountryCode = function() {
var $countrySelectForm = document.getElementById("country_select_form");
var $countrySelect = document.getElementById('country_select');
$countrySelect.addEventListener('change', function() {
$countrySelectForm.submit();
});
};
app.countrySelectHide = function() {
var $countrySelectHideButton = document.getElementById('country_select_hide_button');
$countrySelectHideButton.addEventListener('click', function() {
var $countrySelect = document.getElementById("country_select");
if ($countrySelect.style.display !== "none") {
$countrySelect.style.display = "none";
}
else {
$countrySelect.style.display = "block";
}
});
};
app.selectCountryCode();
app.countrySelectHide();
</script>
尝试以下操作。
您所在国家/地区的价值观没有为其设定价值。
另外，你的按钮在表单标签之外。
你还有2个id="country_show"，我删除了表单标签中的那个；然而，将它放在form标签中也同样有效。
<?php
$country_code = $_REQUEST['choice'];
?>
<script>
function showhide()
{
var div = document.getElementById("country_show");
if (div.style.display !== "none") {
div.style.display = "none";
}
else {
div.style.display = "block";
}
}
</script>
<div id="country_show">
<?php
if ($country_code == "CA") {
$message = "We have set your delivery country to Canada. If this is incorrect, please select your country";
}
elseif ($country_code == "US") {
$message = "We have set your delivery country to United States. If this is incorrect, please select your country";
}
else {
$message = "We have set your shipping charges to International. If this is incorrect, please select your country";
}
echo $message;
?>
<form action="" method="post">
<select name = "choice">
<option value="">Choose location</option>
<option value="CA">Canada</option>
<option value="US">United States</option>
<option>International</option>
</select>
<button id="button" onclick="showhide()">Hide</button>
</form>
</div>