php 单击时获取按钮值并回显它
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Getting button value on click and echo it
提问by user2500189
i am a beginner in php and my first task is to build a calculator and I am here to ask how to get a value from a button and just echo it on the same page. I am trying through method post using isset but enable to display any value on the same page.
我是 php 的初学者，我的第一个任务是构建一个计算器，我在这里询问如何从按钮获取值并在同一页面上回显它。我正在尝试使用 isset 进行方法发布，但可以在同一页面上显示任何值。
<form action="" method="POST">
<input type="button" value="0" name="zero">
</form>
<?php
if (isset($_POST["zero"]))
{
echo $_POST["zero"];
}
?>
回答by MrCode
Only an input[type=submit]will submit the form onclick. It is valid to have multiple submit buttons:
只有一个input[type=submit]将提交表单onclick。有多个提交按钮是有效的：
<form action="" method="POST">
<input type="submit" value="0" name="mybutton">
<input type="submit" value="1" name="mybutton">
<input type="submit" value="2" name="mybutton">
</form>
<?php
if (isset($_POST["mybutton"]))
{
echo $_POST["mybutton"];
}
?>
If you want to use input[type=button]then you will need some Javascript to trigger the submit, and a hidden input to transport the value.
如果你想使用，input[type=button]那么你需要一些 Javascript 来触发提交，以及一个隐藏的输入来传输值。
<script>
window.onload = function(){
document.getElementsByName("mybutton").onclick = function(){
document.getElementsByName("postvar")[0].value = this.value;
document.forms.myform.submit();
}
};
</script>
<form name="myform" action="" method="POST">
<input type="hidden" name="postvar" value="" />
<input type="button" value="0" name="mybutton">
<input type="button" value="1" name="mybutton">
<input type="button" value="2" name="mybutton">
</form>
<?php
if (isset($_POST["postvar"]))
{
echo $_POST["postvar"];
}
?>
回答by swapnesh
Change
改变
<input type="button" value="0" name="zero">
To
到
<input type="submit" value="0" name="zero" />
Add an event handlerif you want to do it via buttonclick.
event handler如果您想通过button单击添加一个。
回答by Subhra Sekhar Mukhopadhyay
Try this
尝试这个
<form action="" method="POST">
<input type="submit" value="0" name="zero">
</form>
<?php
if (isset($_POST["zero"]))
{
echo $_POST["zero"];
}
?>
回答by twitch
Use
<input type="submit" value="0" name="zero">
else if you want to use button use javascript
<form action="" method="POST">
<input type="button" value="0" name="zero">
</form>
<script type="text/javascript">
$("input[type='button']").click(function(){
alert(this.value);
});
</script>
