如何知道哪些＆LT;输入＆GT;当几个的是一个＆LT中定义的submited;形式GT ;? [英] How to know which <input> is submited when several ones are defined within a <form>?
问题描述
我要实现的下面简单的JavaScript函数 submitForm（）根据 XMLHtt prequest 和 FORMDATA 。这个功能可以很好的第一＆LT;形式GT; ，但未能在第二个：该函数应使用 input.formaction form.action >。
I want to implement the below simple JavaScript function submitForm() based on XMLHttpRequest and FormData. This functions works well on the first <form> but fails on the second one: the function should use input.formaction instead of form.action.
如何检测pssed的$ P $ ＆LT;输入＆GT; 并获取相应的 formaction ？
How to detect the pressed <input> and retrieve the corresponding formaction?
（最让答案建议使用一个框架（如jQuery的），这样的处理，但我认为学习只是纯JavaScript比也在学习JS框架更容易。如果你确信这个片段可以用一个框架来写简单，请提出您的版本也请解释为什么你建议的框架是中肯/相关的/适合在这种情况下，我可能会决定去学习自己喜欢的JS框架... 编辑：我发现这个类似的问题： JQuery的GET formaction和formmethod ）
( Most of SO answers advise to use a framework (as jquery) for such processing. But I think learning solely pure JavaScript is easier than learning also JS frameworks. If you are convinced that this snippet can be written simpler using a framework, please propose your version. Please explain also why your advised framework is pertinent/relevant/suitable in this case. I may decide to learn your favorite JS framework... I have found this similar question: JQuery get formaction and formmethod )
<!DOCTYPE html>
<html>
<head>
<script>
function submitForm(form)
{
var xhr = new XMLHttpRequest();
xhr.onload = function() { alert (xhr.responseText); }
xhr.open ("post", form.action, true);
xhr.send (new FormData (form));
return false;
}
</script>
</head>
<body>
<form action="first.php" onsubmit="submitForm(this);">
<fieldset>
<legend>First</legend>
<input type="text" name="data" />
<input type="submit" />
</fieldset>
</form>
<form onsubmit="submitForm(this);">
<fieldset>
<legend>Second</legend>
<input type="text" name="data" />
<input type="submit" value="A" formaction="second-A.php" />
<input type="submit" value="B" formaction="second-B.php" />
</fieldset>
</form>
</body>
</html>
（我已阅读 XMLHtt prequest到的POST HTML表单，的Sending POST数据与XMLHtt prequest 和出色的<一个href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHtt$p$pquest/Using_XMLHtt$p$pquest#Using_FormData_objects"相对=nofollow> MDN文档。）
推荐答案
我会建议成立事件监听器在JavaScript中，这样你就可以访问该事件的对象。
I'd propose to set the event listener in JavaScript, so you can access the Event object.
function submitForm(e) {
// Get the DOM element that submitted the form
var caller = e.target || e.srcElement;
// Set the action to 'formaction' attribute of the caller if it exists, otherwise use the action of the form the caller is in
var action = caller.getAttribute("formaction") || caller.form.action;
// This is your code, I just changed the variable name for the action to 'action'.
var xhr = new XMLHttpRequest();
xhr.onload = function() { alert (xhr.responseText); }
xhr.open ("post", action, true);
xhr.send (new FormData (form));
}
// Get all forms
var forms = document.querySelectorAll("form");
// Iterate over the forms
for (var i = 0; i < forms.length; ++i) {
// Set the event listener
forms.item(i).onsubmit = submitForm;
}
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