我如何获得表单以在提交之前删除链接的一部分？

Question

Say i had a form input to submit a facebook user id, but some don't read and submit the whole link how do i remove the part of the link i don't want, before form submit?

<form>
Facebook id: <input type="text" name="facebookid">
</form>

and the user enters this:

www.facebook.com/UserProfleID

How do i get it to remove the "www.facebook.com/" and just leave the ID? before submit?

Thanks heaps for your time, any help would be great

Answer 1

If you are the one receiving the form , you can just play with the string before starting to work with it. You could delete the substring you dont want using str_replace :

str_replace('www.facebook.com/', '', $input);
str_replace('facebook.com/', '', $input);
str_replace('http://facebook.com', '', $input);

Although I would recommend you to use regular expressions with preg_match .

If you have no control after the submission of the form, then you can use Javascript and make use of the split function:

//str = input string
var parts = str.split("facebook.com/");

//alerting the username
alert(parts[1]);

Answer 2

You could intercept the form submit with javascript and let the user know they made an error. But as others have said you should still validate on the server.

document.forms[0].onsubmit = function(){
     var input = document.getElementsByName('facebookid')[0].split("/");
     if(input.length > 1){ 
         //should do this part with fancy CSS and not an alert box
         alert("Enter your id only plix plox");
         return false;
      }
     return true;
}

Answer 3

<form>
Facebook id: <input type="text" id="userid" name="facebookid">
</form>



$("form").submit( function () {
var arr= $("#userid").val().split("facebook.com/");
$("#userid").val(arr[1]);
} );

It might help you.

Answer 4

If you expect the prefix to be predictable, then you can use a dictionary of strings you can Remove from the input.

However, if you're not able to predict the input, then Regular expressions give you the flexibility to predict the pattern but not the value to be removed.

I would use RegularExpressions if this were my code...largely because I'm fan of writing the least code to do the most work.