Question

我正在尝试通过链接在后台保存数据库，并在前端为该链接提供下载功能。但它会出错。

我的剧本是 -

<script>
$(document).ready(function(){
    $("#download").click(function(){
        var me = $(this), data = me.data('params');
        saveData(me);
});

function saveData(me){  
$.ajax({
       type: "POST",
       url: "download_counter.php",
       data: { client_id: "<? echo $client_id;?>", candidate_id: me }
    });
}
});
</script>

这是链接（看起来很好）

<a href="upload/<? echo $download;?>" id="download" data-params="{'ca_id':'<? echo $ca_id;?>'}"><button name="download"></button></a>

download_counter.php看起来像 -

<?
if (isset($_POST['candidate_id'])) { // Form has been submitted.
    $candidate_id = $_POST['candidate_id'];
    $client_id= $_POST['client_id'];
    $date = date("Y-m-d");
    echo "client - ".$client_id;
    echo "candidate - ".$candidate_id;
    $query = "INSERT INTO `downloads`(`client_id`, `candidate_id`, `download_date`) VALUES ('".$client_id."', '".$candidate_id."', '".$date."')";
    $result = mysql_query($query);  
}
?>

当我点击链接时，它允许下载文件，但数据库不会更新。请帮忙。

Answer 1

检查jquery click event handler，其中包含

// say your selector and click handler is somewhat as in the example
$("some selector").click({param1: "Hello", param2: "World"}, some_function);

// then in the called function, grab the event object and use the parameters like this--
function some_function(event){
    alert(event.data.param1);
    alert(event.data.param2);
}

Answer 2

将参数传递给函数saveData时出错，因此不会发生ajax请求：

$(document).ready(function(){
    $("#download").click(function(){
        var me = $(this), data = me.data('params');
        saveData(data); // was me
});

Answer 3

数据库现在正在更新，但它没有获得candidate_id的值。

我这样做了 -

<script>
$(document).ready(function(){
    $("#download").click(function(){        
        $("#count").hide();
        var me = $(this), data = me.data('params');
        saveData(data); // was me
});

function saveData(data){  
$.ajax({
       type: "POST",
       url: "counter.php",
       data: { client_id: "2", candidate_id: data.ca_id }
    });
}
});
</script>

Answer 4

I think on click the data you are reading is a string and in the given format. 
And you are passing that as data, but since it is not an valid id, 
that value in the database is not updated.

Check this out

从jquery中的链接提交带有参数的表单

4 个答案: