我具有以下形式,并且在单击“加入”按钮后,应将其更改为删除按钮。我想更改文本以说删除并更改其功能。

这是我的代码:

<form action="riderJoin.php" method="post">
    <input type ="hidden" name = id value="<?php echo $row['post_id']; ?>" >
    <input type =submit  class="edit_btn " name = "submit"  value = "Join">
</form>

<script type="text/javascript">
var x = document.getElementsByClassName('edit_btn');

<?php if (isset($_POST['submit'])) { ?>
    var i = <?php echo $_SESSION['postId'] ; ?> - 1 ;
    var y = x[i];
    x[i].textContent = "Delete";
    x[i].style.backgroundColor = "red";
    x[i].style.color = "white";
<?php }?>
</script>


我已经按类名将按钮获取到var x中,并使用x[i]在x内抓取了一个项目,但是当我尝试更改文本内容时,它没有改变。但是,当我将背景色设置为红色时,效果很好。

我做错了什么?

最佳答案

更新:更改按钮文本

创建按钮时,可以看到要更改的文本位于value属性中:

<input type =submit  class="edit_btn" name = "submit" value = "Join">


因此这就是您要更改的内容-而不是textContent例如

  x[i].value = "Delete";


更新:更改窗体操作

要同时更改操作,首先,您需要在表单中添加一个ID,以便我们可以在其中找到JavaScript,例如

<form action="riderJoin.php" method="post" id="subscriptionform">


然后在javascript中,您可以获取它并更改操作,如下所示:

var formelement = document.getElementById('subscriptionform');
formelement.action = "newAction.php"; // set the action to whatever page you want


工作示例:单击按钮更改文本,新操作也将显示



function changebutton() {

    // get the button and change it
    var x = document.getElementsByClassName('edit_btn');
    x[0].value = "Delete";
    x[0].style.backgroundColor = "red";
    x[0].style.color = "white";

    // change the action of the form
    var formelement = document.getElementById('subscriptionform');
    formelement.action = "yourNewAction.php";

    // Just for testing - gets the form action & displays it
    updateStatusText();
}

// Just for testing - gets the form action & displays it
function updateStatusText(){
    var formelement = document.getElementById('subscriptionform');
    currentaction = formelement .action;
    var textelement = document.getElementById('actiontext');
    textelement.innerText= "The form action is: "+currentaction;
}
updateStatusText();

<form action="yourAction.php" method="post" id="subscriptionform">
    <input type=submit class="edit_btn " name="submit" value="Click Me..." onclick="changebutton();  return false;">
</form>

<p id="actiontext"></p>

09-17 15:26
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