Javascript Submit does not include Submit Button V

问题:

Ok, this is less of a question than it is just for my information (because I can think of about 4 different work arounds that will make it work. But I have a form (nothing too special) but the submit button has a specific value associated with it.

<input type='submit' name='submitDocUpdate' value='Save'/>

And when the form gets submitted I check for that name.

if(isset($_POST['submitDocUpdate'])){ //do stuff

However, there is one time when I'm trying to submit the form via Javascript, rather than the submit button.

document.getElementById("myForm").submit();

Which is working fine, except 1 problem. When I look at the $_POST values that are submitted via the javascript method, it is not including the submitDocUpdate. I get all the other values of the form, but not the submit button value.

Like I said, I can think of a few ways to work around it (using a hidden variable, check isset on another form variable, etc) but I'm just wondering if this is the correct behavior of submit() because it seems less-intuitive to me. Thanks in advance.

回答1:

Yes, that is the correct behavior of HTMLFormElement.submit()

The reason your submit button value isn't sent is because HTML forms are designed so that they send the value of the submit button that was clicked (or otherwise activated). This allows for multiple submit buttons per form, such as a scenario where you'd want both "Preview" and a "Save" action.

Since you are programmatically submitting the form, there is no explicit user action on an individual submit button so nothing is sent.

回答2:

Using a version of jQuery 1.0 or greater:

$('input[type="submit"]').click();

I actually was working through the same problem when I stumbled upon this post. click() without any arguments fires a click event on whatever elements you select: http://api.jquery.com/click/

回答3:

Why not use the following instead?

<input type="hidden" name="submitDocUpdate" value="Save" />

回答4:

The submit button value is submitted when the user clicks the button. Calling form.submit() is not clicking the button. You may have multiple submit buttons, and the form.submit() function has no way of knowing which one you want to send to the server.

回答5:

Although the acepted answer is technicaly right. There is a way to carry the value you'd like to assign. In fact when the from is submited to the server the value of the submit button is associated to the name you gave the submit button. That's how Marcin trick is working and there is multiple way you can achive that depending what you use. Ex. in jQuery you could pass

data: { 
    submitDocUpdate = "MyValue" 
}

in MVC I would use:

@using (Html.BeginForm("ExternalLogin", "Account", new { submitDocUpdate = "MyValue" }))

This is actually how I complied with steam requirement of using thier own image as login link using oAuth:

@using (Html.BeginForm("ExternalLogin", "Account", new { provider = "Steam" }, FormMethod.Post, new { id = "steamLogin" }))
{
     <a id="loginLink" class="steam-login-button" href="javascript:document.getElementById('steamLogin').submit()"><img alt="Sign in through Steam" src="https://steamcommunity-a.akamaihd.net/public/images/signinthroughsteam/sits_01.png"/></a>
}

回答6:

Understanding the behavior is good, but here's an answer with some code that solved my problem in jquery and php, that others could adapt. In reality this is stripped out of a more complex system that shows a bootstrap modal confirm when clicking the delete button.

TL;DR Have an input dressed up like a button. Upon click change it to a hidden input.

html

<input
    id="delete" 
    name="delete" 
    type="button" 
    class="btn btn-danger"
    data-confirm="Are you sure you want to delete?"
    value="Delete"></input>

jquery

$('#delete').click(function(ev) {
        button.attr('type', 'hidden');
        $('#form1').submit();
    return false;
});

php

if(isset($_POST["delete"])){
    $result = $foo->Delete();    
}

回答7:

Here is an idea that works fine in all browsers without any external library.

HTML Code

<form id="form1" method="post" >
    ...........Form elements...............
    <input type='button' value='Save' onclick="manualSubmission('form1', 'name_of_button', 'value_of_button')" />
</form>

Java Script

Put this code just before closing of body tag

<script type="text/javascript">
    function manualSubmission(f1, n1, v1){
    var form_f = document.getElementById(f1);
    var fld_n = document.createElement("input");
    fld_n.setAttribute("type", "hidden");
    fld_n.setAttribute("name", n1);
    fld_n.setAttribute("value", v1);
    form_f.appendChild(fld_n);
    form_f.submit();
}
</script>

PHP Code

<?php if(isset($_POST['name_of_button'])){

       // Do what you want to do.
}
?>

Note: Please do not name the button "submit" as it may cause browser incompatibility.