javascript in php

[dadamssg]

im creating a form and i want to use javascript to validate the input by checking it against regex's  and displaying error messages but i want to processes and use the $_POST function to transfer the info...how do i go about enbedding a  javascript function in my php document. i tried to just enter the script and save it as a php file but nothing happenned when i clicked the submit button...

 

heres the javascript

<script type = "text/javascript">
      function validate(){
        //get inputs
        title = document.getElementById("txtTitle").value;
        description = document.getElementById("txtDescription").value;
        location = document.getElementById("txtLocation").value;
      
        //console.log("Title: " + title + ", Description: " + description + ",  Location: " + Location);

        // title must be at least ten characters
        if (title.match({10,80}) == null){
          alert("Please enter a more descriptive Title.");
        } else {
          //name is OK, now check email
      
          //description must exist
          if (description == ""){
            alert("Please enter a Description.");
          } else {
  
            //description is OK, now check local
           
  
             if (location == ""){
            alert("Please enter a Location.");
          } else {
              
            } // end location if
          } // end description if
        } // end title if
      } // end function

    </script>

 

and heres the button

button type = "button"
                onclick = "validate()">
          submit
        </button>

[.josh]

php is parsed on the server.  javascript is parsed on the client.  php looks at javascript as regular text to be output to the client.  It doesn't care about it.  You can use javascript to validate form fields and then have the info submitted by traditional methods (just clicking the form's send button, with the form's method set to 'post'), or you can use some ajax to send it to the server. 

 

Not that I would recommend clientside validation anyways.  It is a trivial thing, even by script kiddie standards, to get around clientside validation. 

[dadamssg]

well im using this and it should work, but im getting an error on the "{" right under the first if statement....??? what am i doing wrong?

if ( !ereg(".{10,80}",$_title)
    {
     print ("<script language = 'javascript'>alert('Please enter a more descriptive Title.');</script>");
    }

if ( $_description = "")
    {
     print("<script language = 'javascript'>alert('Please enter a Description.');</script>");
    }

if ( $_location = "")
    {
     print("<script language = 'javascript'>alert('Please enter a Location.');</script>");
    }	

[.josh]

You're missing a closing quote.  But you would have known that if you read the error.

[dadamssg]

i DID read the error....i can't see where i need one though

[.josh]

so you don't see on the very first line of the code you provided how you have 2 opening parenthesis but only 1 closing?

[dadamssg]

ok well how how do i get a button to run a function..display the errors before actually doing the form action. heres what i got now

 

<?php

function errors() {

if ( !ereg(".{10,80}",$_title) )
    {
     print ("<script language = 'javascript'>alert('Please enter a more descriptive Title.');</script>");
    }

if ( $_description = "")
    {
     print("<script language = 'javascript'>alert('Please enter a Description.');</script>");
    }

if ( $_location = "")
    {
     print("<script language = 'javascript'>alert('Please enter a Location.');</script>");
    }	
}

?>

 

i don't think i have the button right

<input type="submit" name="do" value="Submit" onclick = "errors()" >

[.josh]

Like I said, you can't just intermingle php and javascript like that.  PHP parses and sends results to the client.  If you want server/client interaction without using a submit button,  you would have to separate them and use ajax to make a request to a script and call functions based on what you send via ajax methods.