jQuery - 將文本和var添加到值

Question

我想將普通文本和jQuery值添加到輸入值。

var amount = $('option:selected', this).val(); 
    $('.customfield').val('clicks,<?php echo $userdata['id'] ?>,' + amount +); 

這就是我的，但那是行不通的。有人可以向我解釋，它是如何完成的？

Answer 1

嘗試這種情況：

$('.customfield').val('clicks,<?php echo $userdata["id"] ?>,' + amount); 

//--------double quote to id as is open and ---------^^^^ 
//     closed by single quote and remove last + 

Answer 2

var amount = $('option:selected').val(); 
    $('.customfield').val('clicks,<?php echo $userdata['id'] ?>,' + amount); 

Answer 3

var amount = $('option:selected').val(); // or var amount = $('#selectDropwdownId').val(); 
    $('.customfield').val("clicks,<?php echo $userdata['id'] ?>," + amount); 

Answer 4

嘗試此

var amount = $('option:selected').val(); 
$('.customfield').val('clicks, <?php echo $userdata["id"] ?>,'+amount+');