Perl单击带有WWW :: Mechanize的按钮

Question

I'm new to web scraping with Perl, and I'm trying to submit the page by filling in username and password fields, and clicking submit. I inspected the HTML code of the button in question, and it looks like:

<input type="submit" class="button formSubmission" value="Sign In">

I read that WWW::Mechanize can't handle JavaScript, but I'm not sure if the code I'm looking at is JavaScript, or my implementation is just wrong. I tried $mech->click_button("Sign In"); halfheartedly, but received the error that no such field existed.

Any ideas?

Answer 1

Your button doesn't have name attribute that's why I'm sure there is no need to click it . What you need is just submit your fields to the form :

$mech->submit_form(
    with_fields => {
        your_username_field => $user,
        your_password_field => $password,
        .....
    },
);

Answer 2

Take a look at the documentation for the click_button method. It lists several possible ways to look up the button you want to click. Your button doesn't have a name but it does have a value, so

$mech->click_button( value => "Sign In" );

should do it.

Answer 3

The value attribute of an <input> is no identifier. In the case of a submit button, this is just the text on the button.

If you simply want to submit a form, you may just want submit_form .

If you want to click a button, but this button does not have a identifying name , then you may want to use the features click_button offers. You could specify

$mech->click_button(value => "Sign In");