I have a HTML form in a Mason component(A.m) that uses the post method to call another Mason component(B.m). I want this Mason component(B.m) to return a value to the HTML form in the Mason component(A.m). Then I want to pass this returned value to a Javascript function.
How can I do this? I'm new to web development.
You need to make an AJAX request. Although not strictly necessary, I would suggest you to use jQuery, it will make things a lot easier. Please also have a look at this question: jQuery AJAX submit form
Here's a little example in Mason, it's very simplified of course, you should add some error checking and some escaping also, but I think it could be a good start. Your A.mc component could look like this:
<html>
<head>
<title>This is A</title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function() {
$("#myform").submit(function() { // intercepts the submit event
$.ajax({ // make an AJAX request
type: "POST",
url: "B", // it's the URL of your component B
data: $("#myform").serialize(), // serializes the form's elements
success: function(data)
{
// show the data you got from B in result div
$("#result").html(data);
}
});
e.preventDefault(); // avoid to execute the actual submit of the form
});
});
</script>
</head>
<body>
<form id="myform">
<input type="text" name="mytext" />
<input type="submit" />
</form>
<div id="result"></div>
</body>
</html>
it's just an HTML page that loads jQuery library and that contains your form, and that contains some code to instruct the form to make an AJAX request to B component when the user clicks the Submit button and then to show the contents returned by B component in your result div.
And this could be your B.mc component:
<%class>
has 'mytext';
</%class>
I got this text <strong><% $.mytext %></strong> from your form,
and its length is <strong><% length($.mytext) %></strong>.
Result will be like this:
来源：https://stackoverflow.com/questions/19600596/get-the-return-value-of-a-html-form-post-method