我在页面中有2个操作表单和2个提交按钮。
1是缩放级别
1是以秒为单位的刷新率
当我点击提交缩放时,刷新率将被重置 当我按下提交刷新率时,缩放级别被重置
当一个下拉列表设置为某个值时,如何保持对方的值?
我认为这是一个普通的问题,因为在那里努力工作,所以在这里得到一些很好的指导可以很好的解释......
代码是:
<?php
$submittedValue = "";
$value0 = 1;
$value1 = 1.2;
$value2 = 1.5;
$value3 = 2;
if (isset($_POST["FruitList"])) {
$submittedValue = $_POST["FruitList"];
}
?>
<form action="example3b2vandaag.php" name="fruits" method="post">
<select project="FruitList" id="FruitList" name="FruitList">
<option value = "<?php echo $value0; ?>"<?php echo ($value0 == $submittedValue)?" SELECTED":""?>><?php echo "off"; ?></option>
<option value = "<?php echo $value1; ?>"<?php echo ($value1 == $submittedValue)?" SELECTED":""?>><?php echo $value1; ?></option>
<option value = "<?php echo $value2; ?>"<?php echo ($value2 == $submittedValue)?" SELECTED":""?>><?php echo $value2; ?></option>
<option value = "<?php echo $value3; ?>"<?php echo ($value3 == $submittedValue)?" SELECTED":""?>><?php echo $value3; ?></option>
</select>
<input type="submit" name="submit" id="submit" value="Set zoom level" />
</form>
<?php
$submittedValue = "";
$value0 = 1000;
$value1 = 20000;
$value2 = 30000;
$value3 = 90000;
if (isset($_POST["FruitList2"])) {
$submittedValue = $_POST["FruitList2"];
}
?>
<form action="example3b2vandaag.php" name="fruits2" method="post">
<select project="FruitList2" id="FruitList2" name="FruitList2">
<option value = "<?php echo $value0; ?>"<?php echo ($value0 == $submittedValue)?" SELECTED":""?>><?php echo $value0; ?></option>
<option value = "<?php echo $value1; ?>"<?php echo ($value1 == $submittedValue)?" SELECTED":""?>><?php echo $value1; ?></option>
<option value = "<?php echo $value2; ?>"<?php echo ($value2 == $submittedValue)?" SELECTED":""?>><?php echo $value2; ?></option>
<option value = "<?php echo $value3; ?>"<?php echo ($value3 == $submittedValue)?" SELECTED":""?>><?php echo $value3; ?></option>
</select>
<input type="submit" name="submit" id="submit" value="Set refresh milliseconds" />
</form>
答案 0 :(得分:2)
I don't see any reason why you would want two forms, you can put the two select boxes into one form. And please don't use unintelligent variable names such as $value0, $submittedValue and $Fruitlist, because this isn't about fruits.
Here are the two select boxes into one form:
<?php
$zoom = "";
$zoom0 = 1;
$zoom1 = 1.2;
$zoom2 = 1.5;
$zoom3 = 2;
$refresh = "";
$refresh0 = 1000;
$refresh1 = 20000;
$refresh2 = 30000;
$refresh3 = 90000;
if (isset($_POST["zoom"])) {
$zoom = $_POST["zoom"];
}
if (isset($_POST["refresh"])) {
$refresh = $_POST["refresh"];
}
?>
<form action="testForm.php" name="controlpanel" method="post">
ZoomLevel:<br />
<select project="ControlPanel" id="ControlPanel" name="zoom">
<option value = "<?php echo $zoom0; ?>"<?php echo ($zoom0 == $zoom)?" SELECTED":""?>><?php echo "off"; ?></option>
<option value = "<?php echo $zoom1; ?>"<?php echo ($zoom1 == $zoom)?" SELECTED":""?>><?php echo $zoom1; ?></option>
<option value = "<?php echo $zoom2; ?>"<?php echo ($zoom2 == $zoom)?" SELECTED":""?>><?php echo $zoom2; ?></option>
<option value = "<?php echo $zoom3; ?>"<?php echo ($zoom3 == $zoom)?" SELECTED":""?>><?php echo $zoom3; ?></option>
</select>
<br />
Refresh rate:<br />
<select project="ControlPanel" id="ControlPanel" name="refresh">
<option value = "<?php echo $refresh0; ?>"<?php echo ($refresh0 == $refresh)?" SELECTED":""?>><?php echo $refresh0; ?></option>
<option value = "<?php echo $refresh1; ?>"<?php echo ($refresh1 == $refresh)?" SELECTED":""?>><?php echo $refresh1; ?></option>
<option value = "<?php echo $refresh2; ?>"<?php echo ($refresh2 == $refresh)?" SELECTED":""?>><?php echo $refresh2; ?></option>
<option value = "<?php echo $refresh3; ?>"<?php echo ($refresh3 == $refresh)?" SELECTED":""?>><?php echo $refresh3; ?></option>
</select><br />
<input type="submit" name="submit" id="submit" value="Set configurations" />
</form>
To use the data you get from the form you can use $_POST["zoom"] and $_POST["refresh"], because that's what the name properties of the select boxes are. See http://www.w3schools.com/php/php_form_complete.asp for more information on html forms and how to use the $_POST data.