我是php和ajax的新手。我有一个适合我的剧本,它几乎做了我想做的事情。但是我希望添加这段代码在有图像显示,一旦一个产品被完全选中,它有id。
$dynamic_image .= '
<a href="product.php?d_id=' . $did . '"><img style="height:auto; width:auto; max-width:7em; max-height:10em; padding :12px; margin: 9px; border: 3px solid #e3e3e3;" src="design_images/' . $did . '.png" alt="' . $name . '" /></a>';
我还想隐藏'id',或者至少不是一个选择选项。并且一旦产品被完全选中,价格和添加到购物车按钮就会显示。
我知道这要求很多,但任何帮助都会很棒,因为我现在完全被困住了。谢谢你!
下面是select_list.php文件
<?php
// Multiple select lists - http://coursesweb.net/ajax/
if(!isset($_SESSION)) session_start();
// Here add your own data for connecting to MySQL database
$server = 'localhost';
$user = 'root';
$pass = '';
$dbase = 'mystore';
// Here add the name of the table and columns that will be used for select lists, in their order
// Add null for 'col_description' if you don`t want to display their data too
$table = 'products';
$ar_cols = array('category', 'subcategory', 'size', 'color', 'id', 'price');
$preid = 'slo_'; // a prefix used for element's ID, in which Ajax will add <select>
$col = $ar_cols[0]; // the variable used for the column that wil be selected
$re_html = ''; // will store the returned html code
$pre_html = '';
// if there is data sent via POST, with index 'col' and 'wval'
if(isset($_POST['col']) && isset($_POST['wval'])) {
// set the $col that will be selected and the value for WHERE (delete tags and external spaces in $_POST)
$col = trim(strip_tags($_POST['col']));
$wval = "'".trim(strip_tags($_POST['wval']))."'";}
$key = array_search($col, $ar_cols); // get the key associated with the value of $col in $ar_cols
$wcol = $key===0 ? $col : $ar_cols[$key-1]; // gets the column for the WHERE clause
$_SESSION['ar_cols'][$wcol] = isset($wval) ? $wval : $wcol; // store in SESSION the column and its value for WHERE
// gets the next element in $ar_cols (needed in the onchange() function in <select> tag)
$last_key = count($ar_cols)-1;
$next_col = $key<$last_key ? $ar_cols[$key+1] : '';
$conn = new mysqli($server, $user, $pass, $dbase); // connect to the MySQL database
if (mysqli_connect_errno()) { exit('Connect failed: '. mysqli_connect_error()); } // check connection
// sets an array with data of the WHERE condition (column=value) for SELECT query
for($i=1; $i<=$key; $i++) {
$ar_where[] = '`'.$ar_cols[$i-1].'`='.$_SESSION['ar_cols'][$ar_cols[$i-1]];}
// define a string with the WHERE condition, and then the SELECT query
$where = isset($ar_where) ? ' WHERE '. implode($ar_where, ' AND ') : '';
$sql = "SELECT DISTINCT `$col` FROM `$table`".$where;
$result = $conn->query($sql); // perform the query and store the result
// if the $result contains at least one row
if ($result->num_rows > 0) {
// sets the "onchange" event, which is added in <select> tag
$onchg = $next_col!==null ? " onchange='"ajaxReq('$next_col', this.value);'"" : '';
// sets the select tag list (and the first <option>), if it's not the last column
if($col!=$ar_cols[$last_key]) $re_html = $col. ': <select name="'. $col. '"'. $onchg. '><option>- - -</option>';
while($row = $result->fetch_assoc()) {
// if its the last column, reurns its data, else, adds data in OPTION tags
if($col==$ar_cols[$last_key]) $re_html .= '<br/>$'. $row[$col];
elseif($col==$ar_cols[$last_key]) $pre_html .= '<br/>$'. $row[$col];
else $re_html .= '<option value="'. $row[$col]. '">'. $row[$col]. '</option>'; }
if($col!=$ar_cols[$last_key]) $re_html .= '</select> '; // ends the Select list} else { $re_html = '0 results';}
$conn->close();
// if the selected column, $col, is the first column in $ar_cols
if($col==$ar_cols[0]) {
// adds html code with SPAN (or DIV for last item) where Ajax will add the select dropdown lists
// with ID in each SPAN, according to the columns added in $ar_cols
for($i=1; $i<count($ar_cols); $i++) {
if($ar_cols[$i]===null) continue;
if($i==$last_key) $re_html .= '<div id="'. $preid.$ar_cols[$i]. '"> </div>';
else $re_html .= '<span id="'. $preid.$ar_cols[$i]. '"> </span>'; }
// adds the columns in JS (used in removeLists() to remove the next displayed lists when makes other selects)
$re_html .= '<script type="text/javascript">var ar_cols = '.json_encode($ar_cols).'; var preid = "'. $preid. '";</script>';
}else echo $re_html;
?>
这里是ajax_select.js文件供参考
// Multiple select lists - http://coursesweb.net/ajax/
// function used to remove the next lists already displayed when it chooses other options
function removeLists(colid) {
var z = 0;
// removes data in elements with the id stored in the "ar_cols" variable
// starting with the element with the id value passed in colid
for(var i=1; i<ar_cols.length; i++) {
if(ar_cols[i]==null) continue;
if(ar_cols[i]==colid) z = 1;
if(z==1) document.getElementById(preid+ar_cols[i]).innerHTML = '';
}
}
// sends data to a php file, via POST, and displays the received answer
function ajaxReq(col, wval) {
removeLists(col); // removes the already next selects displayed
// if the value of wval is not '- - -' and '' (the first option)
if(wval!='- - -' && wval!='') {
var request = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP'); // XMLHttpRequest instance
var php_file = 'select_list.php'; // path and name of the php file
// create pairs index=value with data that must be sent to server
var data_send = 'col='+col+'&wval='+wval;
request.open("POST", php_file, true); // set the request
document.getElementById(preid+col).innerHTML = 'Loadding...'; // display a loading notification
// adds a header to tell the PHP script to recognize the data as is sent via POST
request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
request.send(data_send); // calls the send() method with data_send
// Check request status
// If the response is received completely, will be added into the tag with id value of "col"
request.onreadystatechange = function() {
if (request.readyState==4) {
document.getElementById(preid+col).innerHTML = request.responseText;
}
}
}
}
任何想法?
我假设函数ajaxReq正在显示产品列表?在选择一个选项时你想要加载图像吗?
这将取决于当您从ajax获得列表时,您的图像url数据将显示在哪里。
我将添加一个id的选择元素,并使用jquery插入图像点击一个选项。假设您将图像url添加到值。
<select id="selectId">
<option value="/img/product.png">Product List</option>
</select>
<div id="productImg">
</div>
<script>
$(function(){
$("#selectId option").click(function(){
$("#productImg").html('<a href="'+$(this).val()+'"><img src="'+$(this).val()+'"/>Product img</a>');
});
});
</script>
在这里修改:https://jsfiddle.net/kqyfw2s2/