HTML表单 - 如果未输入任何内容，则使用值填充输入

Question

I'm creating a basic subscribe form for a system that requires both email address and last name (SugarCRM in case anyone is interested).

I need to populate the last name input value with something (anything, it doesn't matter) only if the visitor doesn't put their own last name in.

As the subscribe action is hosted (Mail Chimp) I don't have access to it to pre-validate, unless this can happen before it's passed on. I'm wading into deeper PHP waters than I'm comfortable with! Is this possible with jQuery?

So basically I'm getting around the required last name by filling the value with something.

Answer 1

Check the lastname on submit of the form, if it doesn't have value, put "foo" in it:

$('#formId').submit(function() { // attach submit handler to the form.
    var $lastName = $('#lastName'); // get the last name element.
    if (!$lastName.val())   // if it doesn't have value.
        $lastName.val('foo'); // put foo as a value.
});​

You should replace formId and lastName to the actual ids of the form and last name element.