提交按钮单击将其值更改为另一件事
[英]Submit button clicking changing the value of it to another thing
问题描述
maybe very easy!
也许很容易！ I'm php coder and I don't have experience in js but I must do this for one of my codes suppose I have sub1 in page after clicking it must be that sub1 but value now is sub2我是 php 编码器，我没有 js 经验，但我必须为我的一个代码执行此操作，假设我在点击后页面中有 sub1，它必须是 sub1，但现在的值是 sub2
<html>
<head>
<title>pharmacy</title>
</head>
<body>
<form method="post" action="pharmacy.php">
<?php
//some code
if(array_key_exists('update',$_POST)){
//somecode
}
?>
<input type="submit" name="update" value="<?php echo if(isset($_GET['update'])) ? 'Show' : 'Update' ?> ">
</form>
</body>
</html>
3 个解决方案
解决方案1
4 已采纳 2011-06-03 11:05:33
show as function name does not really make sense here (imo), but you could do: show为 function 名称在这里没有意义（imo），但你可以这样做：
<input type="submit" name="sub" value="sub1" onclick="show(this)">
and和
function show(element) {
element.value = 'sub2';
}
Important:重要的：
But that will actually not solve your problem.但这实际上并不能解决您的问题。 As soon as you click the button, the form is submitted, meaning the browser initiates a new request and will load a new page .一旦你点击按钮，表单就会被提交，这意味着浏览器会发起一个新的请求并加载一个新的页面。 So every change you made the current page is lost anyway.因此，您对当前页面所做的每项更改都会丢失。
The question is: What are you trying to do?问题是：你想做什么？
It seems to me that you should change the value of the button on the server side.在我看来，您应该更改服务器端按钮的值。 You have to keep track which form was submitted (or how often, I don't know what you are trying to do) and set the value of the button accordingly.您必须跟踪提交的表单（或者多久提交一次，我不知道您要做什么）并相应地设置按钮的值。
Update:更新：
I see several possibilities to solve this:我看到了解决这个问题的几种可能性：
You could keep using JavaScript and send and get the data via Ajax .
您可以继续使用 JavaScript 并通过Ajax发送和获取数据。 As you have no experience with JavaScript, I would say you have to learn more about JavaScript and Ajax first before you can use it.由于您没有使用 JavaScript 的经验，我想说您必须先了解有关 JavaScript 和 Ajax 的更多信息，然后才能使用它。You could add a GET parameter in your URL with which you can know which label to show for the button.
您可以在 URL 中添加一个 GET 参数，您可以通过该参数知道要为按钮显示哪个 label。 Example:例子：<form method="post" action="?update=1">and
和<input type="submit" name="sub" value="<?php echo isset($_GET['update'])? 'Show': 'Update'?> ">Similar to 2, but use a session variable (and not a GET parameter) to keep track of the state.
类似于 2，但使用session 变量（而不是 GET 参数）来跟踪 state。
Update2:更新2：
As you are already having $_POST['update'] you don't need the URL parameter.由于您已经拥有$_POST['update'] ，因此您不需要 URL 参数。 It could just be:它可能只是：
<html>
<head>
<title>pharmacy</title>
</head>
<body>
<form method="post" action="pharmacy.php">
<input type="submit" name="update" value="<?php echo isset($_POST['update']) ? 'Update' : 'Show'; ?> ">
</form>
</body>
</html>
解决方案2
0 2011-06-03 11:06:09
<html>
<head>
<title>test</title>
<script>
function show()
{
document.getElementById("sub").value= "sub2";
return true;
}
</script>
</head>
<body>
<form method="post">
<input type='submit' id="sub" name='sub' value="sub1" onclick="return show()">
</form>
</body>
</html>
解决方案3
0 2011-06-03 11:06:31
This should do it这应该这样做
function show(){
document.getElementsByName('sub')[0].value = 'sub2';
return false;
}
Edit: if you don't want it to submit the form, just add a return false , but then you'd need to change your onclick from your submit button to your forms onsubmit ;编辑：如果您不希望它提交表单，只需添加一个return false ，但是您需要将您的onclick从您的提交按钮更改为您的 forms onsubmit ；
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