php HTML 定义激活的选择选项
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HTML define what selection option is active
提问by JustinPGriffen
I have a select box with the following (it has been shortened):
我有一个带有以下内容的选择框（已缩短）：
<select id="viewSelector" name="when" style="width:92%;">
<option value="USA">USA</option>
<option value="Australia">Australia</option>
<option value="Germany">Germany</option>
</select>
If the user logs into the control panel and wants to change his country, he gets presented with this form. My problem is that everytime USA is the default and I can not change this depending on the users country. For example, the user lives in Australia. He wants to change his country to USA and goes to this page. I want the country that is displayed to be Australia. Let me know if this makes sense.
如果用户登录控制面板并想要更改他的国家/地区，则会显示此表单。我的问题是，每次美国都是默认值，我无法根据用户所在的国家/地区进行更改。例如，用户居住在澳大利亚。他想将他的国家/地区更改为美国并转到此页面。我希望显示的国家是澳大利亚。让我知道这是否有意义。
回答by Bj?rn Kaiser
To preselect a value, just add the selected attribute to the desired option.
要预选一个值，只需将所选属性添加到所需选项即可。
<select id="viewSelector" name="when" style="width:92%;">
<option value="USA">USA</option>
<option value="Australia" selected="selected">Australia</option>
<option value="Germany">Germany</option>
</select>
This will preselect Australia for example.
例如，这将预选澳大利亚。
回答by Oded
You need to add a selectedattribute to the option you want to select, as described in the spec.
您需要为selected要选择的选项添加一个属性，如规范中所述。
<select id="viewSelector" name="when"">
<option value="USA">USA</option>
<option value="Australia" selected="selected">Australia</option>
<option value="Germany">Germany</option>
</select>
In your script, you need to emit this attribute for whatever default you want to display.
在您的脚本中，您需要为要显示的任何默认值发出此属性。
回答by Bailey Parker
Use selectedon the <option>tag that names the user's current country:
selected在<option>命名用户当前国家的标签上使用：
<option value="Australia" selected="selected">Australia</option>
So in PHP:
所以在 PHP 中：
<select>
<?php
$countries = array('USA', 'Australia', 'Germany');
$current_country = 'Australia';
foreach($countries as $country) {
if($country == $current_country) {
echo '<option selected="selected">'.$country.'</option>';
} else {
echo '<option>'.$country.'</option>';
}
}
?>
</select>
回答by Tyilo
Use the selectedattribute of the optiontag.
使用标签的selected属性option。
<select id="viewSelector" name="when" style="width:92%;">
<option value="USA">USA</option>
<option value="Australia">Australia</option>
<option selected value="Germany">Germany</option>
</select>
回答by Francis Avila
The html looks like:
html 看起来像：
<option selected value="Australia">Australia</option>
In the php loop that builds this html, compare the current option name with the user's current country (retrieved from a database or where-ever). When the two match, add selected
在构建此 html 的 php 循环中，将当前选项名称与用户的当前国家/地区（从数据库或任何地方检索）进行比较。当两者匹配时，添加selected
回答by Carlos Chaveztoro
A bit shorter:
短一点：
foreach($paises as $key=>$value)
{
if($key == "PE"){$activo = ' selected="selected" '; }else{$activo = "";}
echo "<option $activo value=\"$key\">$value</option>";
}
