使用php和另一个动态Combobox的onselection更改值创建Dynamic Combobox

Question

我想创建HTML Dynamic Combobox,它使用来自db的php脚本和另一个动态Combobox的onselection更改值进行填充.最初第二个组合框应该是不可见的,并且在选择第一个组合框时,第二个组合框可见与相似数据相关.例如,我有这个表:

    Category Name
    Airport  ABC
    Airport  XYZ
    College  a1
    College  b1
    College  b2
    busstop  a
    busstop  b
    busstop  c
    busstop  d

因此,1st Combobox将包含Unique Category列表(如:Airport,College,busStop),并且在此选择的基础上启用第二个组合框,其中包含相关值,如果用户选择Airport,则第二个组合框将仅包含(ABC,XYZ).

我基本上只想用HTML,JAVASCRIPT和PHP来做这件事.

任何建议表示赞赏..

Answer 1

使用下面的代码片段,我假设你有一个数组填充数据库行作为对象,我将其命名为$ results;

编辑:如何获取查询对象:http: //www.php.net/manual/en/mysqli-result.fetch-object.php

我首先收集用于创建组合框的数据:

$combobox_data = array();

$results = mysqli_query("SELECT * FROM TABLE");
//create a multi dimensional array with names per category
while($row = mysqli_fetch_object($results)){
    $combobox_data[$row->Category][] = $row->Name;
}



$category_combobox_html = "";
$name_combo_boxes_html = "";
//create category combo_box
foreach($combobox_data as $category=>$names){

    //Add category option to  category combo-box
    $category_combobox_html .= '<option value="'.$category.'">'.$category.'</option>';

    //Create Names combo-box for this category
    $name_combo_boxes_html .= '<select id="'.$category.'" name="'.$category.'" class="hidden_combobox">';

    //loop names, to add Names in the combo-box for this category
    foreach($names as $name){
        $name_combo_boxes_html .= '<option value="'.$name.'">'.$name.'</option>';
    }
    //end your combo box for this category
    $name_combo_boxes_html .= '</select>';
}

你的CSS

<style type="text/css" media="screen">
    .hidden_combobox{
        display:none;
    }
</style>

你的HTML

<select name="categories" id="categories">
<?php echo $category_combobox_html; ?> 
</select>


<?php echo name_combo_boxes_html ;?>

你的javascript

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">

    //when you select something from category box
    $("#categories").change(function(){

        //get selected category
        var selectedValue = $(this).find(":selected").val();

        //hide all nameboxes
        $('.namebox').each(function(){
           $(this).hide();
        });

        //show combobox for this select
        $('#'+selectedValue).show();
    });
</script>

你的结果是这样的:

除非您选择与combo_box匹配的类别,否则将隐藏所有名称组合框

<select name="categories" id="categories">
    <option value="Airport">Airport</option>
    <option value="College">College</option>
    <option value="busstop">busstop</option>
</select>

<select id="Airport" name="Airport" class="namesbox hidden_combobox">
    <option value="ABC">ABC</option>
    <option value="XYZ">XYZ</option>
</select>
<select id="College" name="College" class="namesbox hidden_combobox">
    <option value="a1">a1</option>
    <option value="b1">b1</option>
    <option value="b2">b2</option>
</select>
<select id="busstop" name="busstop" class="namesbox hidden_combobox">
    <option value="a">a</option>
    <option value="b">b</option>
    <option value="c">c</option>
    <option value="d">d</option>
</select>