根据下拉选择填充数据库中的另一个选择下拉列表
inf*_*ity 6 javascript php ajax
我建立一个网站,以了解编码,我试图建立一个工具,其中用户点击包含一些类别名称从数据库中抽取的选择/下拉猫,然后又选择会出现子目录名从数据库中抽取SUBCAT.这几乎完全像Yelp(下到类别),如Yelp(下到类别).
我还做了一个图表:
我已经有一个从cat数据库中提取的类别下拉列表:
<p><b>Category:</b><br />
<?php
$query="SELECT id,cat FROM cat";
$result = mysql_query ($query);
echo"<select name='cselect3' class='e1'><option value='0'>Please Select A Category</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value=\"".htmlspecialchars($catinfo['cat'])."\">".$catinfo['cat']." </option>";
}
echo"</select>";
?>
我有一个从subcat数据库中提取的子cat:
<p><b>Subcat1:</b><br />
<?php
$query="SELECT id,subcat FROM subcat";
$result = mysql_query ($query);
echo"<select name='sselect1' class='e1'><option value='0'>Please Select A Category</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value=\"".htmlspecialchars($catinfo['subcat'])."\">".$catinfo['subcat']."</option>";
}
echo"</select>";
?>
如何根据用户点击类别并使其自动显示来创建子类别下拉列表？非常感谢任何和所有的帮助!
dan*_*ano 19
我只是将变量放入javascript与php,然后使用javascript函数..不需要jquery或AJAX.
但是你需要为子类别设置一个外键,无论如何..即 - 对于subcat表中的每个记录,你需要给它一个catid,以便引用...
<?php
$db = new mysqli('localhost','user','password','dbname');//set your database handler
$query = "SELECT id,cat FROM cat";
$result = $db->query($query);
while($row = $result->fetch_assoc()){
$categories[] = array("id" => $row['id'], "val" => $row['cat']);
}
$query = "SELECT id, catid, subcat FROM subcat";
$result = $db->query($query);
while($row = $result->fetch_assoc()){
$subcats[$row['catid']][] = array("id" => $row['id'], "val" => $row['subcat']);
}
$jsonCats = json_encode($categories);
$jsonSubCats = json_encode($subcats);
?>
<!docytpe html>
<html>
<head>
<script type='text/javascript'>
<?php
echo "var categories = $jsonCats; \n";
echo "var subcats = $jsonSubCats; \n";
?>
function loadCategories(){
var select = document.getElementById("categoriesSelect");
select.onchange = updateSubCats;
for(var i = 0; i < categories.length; i++){
select.options[i] = new Option(categories[i].val,categories[i].id);
}
}
function updateSubCats(){
var catSelect = this;
var catid = this.value;
var subcatSelect = document.getElementById("subcatsSelect");
subcatSelect.options.length = 0; //delete all options if any present
for(var i = 0; i < subcats[catid].length; i++){
subcatSelect.options[i] = new Option(subcats[catid][i].val,subcats[catid][i].id);
}
}
</script>
</head>
<body onload='loadCategories()'>
<select id='categoriesSelect'>
</select>
<select id='subcatsSelect'>
</select>
</body>
</html>
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