在 javascript 列表中制作下拉列表中的选项 html 元素项？
<html>
<body>
<?php
//student interface
$file = fopen("subject.csv","r");
$subjects = fgetcsv($file);
fclose($file);
//puts the csv file provided into a 2d array
$studentTable = array();
if (($handle = fopen("students.csv", "r")) !== FALSE) {
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
$studentTable[] = $data;
} fclose($handle);
}
//creates list that will store list of girls emails
$usernames = array();
//runs through studentTable and appends emails to toEmail.
for ($I = 0; $I < sizeof($studentTable); $I++){
array_push($usernames, $studentTable[$I][0]);
}
?>
<script type="text/javascript">
// Using PHP implode() function to turn the php list into a javascript list
var subjects = <?php echo '["' . implode('", "', $subjects) . '"]' ?>;
var usernames = <?php echo '["' . implode('", "', $usernames) . '"]' ?>;
var select = document.getElementById("usernames");
for(var i = 0; i < usernames.length; i++) {
var opt = usernames[i];
var el = document.createElement("option");
el.textContent = opt;
el.value = opt;
select.appendChild(el);
}
var subchoice = [];
subchoice.push(document.getElementById("choice1"), document.getElementById("choice2"), document.getElementById("choice3"), document.getElementById("choice4"), document.getElementById("choice5"));
for(var x = 0; x < subchoice.length; x++) {
for(var i = 0; i < subjects.length; i++) {
var opt = subjects[i];
var el = document.createElement("option");
el.textContent = opt;
el.value = opt;
subchoice[x].appendChild(el);
}
}
var six = [];
six = subjects;
six.push("null");
var select = document.getElementById("choice6");
for(var i = 0; i < six.length; i++) {
var opt = six[i];
var el = document.createElement("option");
el.textContent = opt;
el.value = opt;
select.appendChild(el);
}
</script>
我无法在下拉选项卡中显示任何内容。下拉列表应该是主题或用户名列表中的项目。但是，即使我认为我的编码正确，也没有任何反应。它给了我这个错误消息：“Uncaught SyntaxError: Unexpected token '<'” 我已经寻找这个额外的令牌但似乎找不到它，请帮忙！
qq_花开花谢_01回答
-
白猪掌柜的
<html><body><?php//student interface$file = fopen("subject.csv","r");$subjects = fgetcsv($file);fclose($file);//puts the csv file provided into a 2d array$studentTable = array();if (($handle = fopen("students.csv", "r")) !== FALSE) { while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) { $studentTable[] = $data; } fclose($handle);}//creates list that will store list of girls emails$usernames = array();//runs through studentTable and appends emails to toEmail. for ($I = 0; $I < sizeof($studentTable); $I++){ array_push($usernames, $studentTable[$I][0]); } ?><h2> Select your subjects! </h2><form method="POST" action='handlestudents.php'><p> Select your name </p><select id='userN' name='userN'> <option selected="selected">Choose one</option> <?php // Iterating through the product array foreach($usernames as $item){ ?> <option value="<?php echo strtolower($item); ?>"><?php echo $item; ?></option> <?php } ?></select><p> Select your 1st choice subject </p> <select id='choice1' name='choice1'> <option selected="selected" >Choose a subject</option> <?php // Iterating through the product array foreach($subjects as $item){ ?> <option value="<?php echo strtolower($item); ?>"><?php echo $item; ?></option> <?php } ?> </select><p> Select your 2nd choice subject </p> <select id='choice2' name='choice2'> <option selected="selected" >Choose a subject</option> <?php // Iterating through the product array foreach($subjects as $item){ ?> <option value="<?php echo strtolower($item); ?>"><?php echo $item; ?></option> <?php } ?> </select><p> Select your 3rd choice subject </p> <select id='choice3' name='choice3'> <option selected="selected" >Choose a subject</option> <?php // Iterating through the product array foreach($subjects as $item){ ?> <option value="<?php echo strtolower($item); ?>"><?php echo $item; ?></option> <?php } ?> </select><p> Select your 4th choice subject </p> <select id='choice4' name='choice4'> <option selected="selected" >Choose a subject</option> <?php // Iterating through the product array foreach($subjects as $item){ ?> <option value="<?php echo strtolower($item); ?>"><?php echo $item; ?></option> <?php } ?> </select><p> Select your 5th choice subject </p> <select id='choice5' name='choice5' > <option selected="selected" >Choose a subject</option> <?php // Iterating through the product array foreach($subjects as $item){ ?> <option value="<?php echo strtolower($item); ?>"><?php echo $item; ?></option> <?php } ?> </select><p> Select your 6th choice subject (none is an option) </p> <select id='choice6' name='choice6'> <option selected="selected" >Choose a subject</option> <?php // Iterating through the product array foreach($subjects as $item){ ?> <option value="<?php echo strtolower($item); ?>"><?php echo $item; ?></option> <?php } ?> <option value = ""> None </option> </select><input type="submit" value="Submit"></form></body></html>
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