更改输入值并在JavaScript中提交表单 [英] Change value of input and submit form in JavaScript

问题描述

我目前正在处理基本表格.当您单击提交"按钮时，它应首先更改字段的值，然后照常提交表单.看起来有点像这样:

I'm currently working on a basic form. When you hit the submit button, it should first change the value of a field, and then submit the form as usual. It all looks a bit like this:

<form name="myform" id="myform" action="action.php">
    <input type="hidden" name="myinput" value="0" />
    <input type="text" name="message" value="" />
    <input type="submit" name="submit" onclick="DoSubmit()" />
</form>

这就是我对JavaScript代码的理解程度.它将"myinput"的值更改为1，但未提交表单.

And this is how far I've come with the JavaScript code. It changes "myinput"'s value to 1, but it does not submit the form.

function DoSubmit(){
  document.myform.myinput.value = '1';
  document.getElementById("myform").submit();
}

推荐答案

您可以改为执行以下操作:

You could do something like this instead:

<form name="myform" action="action.php" onsubmit="DoSubmit();">
    <input type="hidden" name="myinput" value="0" />
    <input type="text" name="message" value="" />
    <input type="submit" name="submit" />
</form>

然后修改您的DoSubmit函数，使其仅返回true，表示可以，现在您可以提交表单了".浏览器:

And then modify your DoSubmit function to just return true, indicating that "it's OK, now you can submit the form" to the browser:

function DoSubmit(){
  document.myform.myinput.value = '1';
  return true;
}

我还要警惕在提交按钮上使用onclick事件；事件的顺序不是立即显而易见的，并且如果用户提交(例如，在文本框中单击return)，则不会调用您的回调.

I'd also be wary of using onclick events on a submit button; the order of events isn't immediately obvious, and your callback won't get called if the user submits by, for example, hitting return in a textbox.

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