Delaying function call in javascript

Question

2.00/5 (1 vote)

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Hi CPs,
I am currently working in Foundation and AlertifyJS. Below function checks if form element content is equal to 'heaven' and 'hell'. If it is false it shows the custom error message. But if it succeeds it should show the Success alert but the page refreshes. I was thinking about delaying the function return with callback() but didnt make a difference. Here's the code. Thanks in Advance.

C#

$(function() {
            $('.run').click(function(event) {
                var userid = document.getElementById('uid').value;
                var password = document.getElementById('pass').value;
                if(userid == 'heaven' && password == 'hell') {
                        alertify.success("Success");
                        return true;
                }
                else {
                    alertify.error("Failed");
                    return false;
                }
            });
        });

XML

<form method="post" onsubmit="return test();" action="success.php">
   <label for="uid"><b>Username</b></label>
   <input type="text" id="uid" name="uid"/>
   <label for="pass"><b>Password</b></label>
   <input type="password" id="pass" name="pass"/>
   <input type="submit" class="run" value="Log In"/>
</form>

Posted 2-Aug-15 6:17am

Ashwin2013

Updated 2-Aug-15 7:25am

v2

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Afzaal Ahmad Zeeshan · Accepted Answer · 2015-08-02T06:58:00

Solution 1

Apart from what you have shared, the page only refreshes in case of when the result (of expression) is true. That is because you have not stopped the code from doing what it is intended to do, submit the form.

To overcome this, write this function to your code. event.preventDefault() would make sure that the page is not refreshed, return false in the other blocks does this for you and makes sure that the code doesn't propagate and form isn't submitted (indirectly page doesn't refresh).

JavaScript

$(function() {
            $('.run').click(function(event) {
                event.preventDefault(); // This would do the trick now
                var userid = document.getElementById('uid').value;
                var password = document.getElementById('pass').value;
                if(userid == 'heaven' && password == 'hell') {
                        alertify.success("Success");
                        return true;
                }
                else {
                    alertify.error("Failed");
                    return false;
                }
            });
        });

Now when you will run the code, in both cases it won't submit the form. I would still recommend that you remove those return statements. They are of no use as event handlers are not intended to return anything at all.

Posted 2-Aug-15 6:58am

Afzaal Ahmad Zeeshan

Comments

Ashwin2013 2-Aug-15 13:23pm

I'm sorry but the form has an action that will do necessary processing in a php file. I will update the code.

Afzaal Ahmad Zeeshan 2-Aug-15 14:36pm

Did the code work?

Ashwin2013 2-Aug-15 15:29pm

It does work, but it doesn't return any value. How can I pass the values to the php page? How can I resume my process after submitting the form with correct details?

Afzaal Ahmad Zeeshan 2-Aug-15 15:31pm

You have not written any code for sending the data to PHP page. Also, your problem also didn't mention which framework to be used. I suggest that you close this thread by marking this as answer (to this problem), and start a new thread for sending the data. You will be able to seek help on the new thread you create for the problem you share. :)

Ashwin2013 2-Aug-15 15:47pm

I was just hesitant to make another thread which will just be seriously down-voted. Imagine a thread like "How to send data from HTML to PHP?". Posting the same problem with a new line of code added in another thread seems to be a waste. while your suggestion partially worked, it creates a new problem of not sending data to the next page. This is a basic login form, so it would automatically talk with the database to authenticate or record the information. As to frameworks I'm open to suggestions, on which is better suited for the task. I was thinking about inline PHP code which would save the status to the database.

Afzaal Ahmad Zeeshan 2-Aug-15 15:54pm

Indeed and not only just down-voted but being closed. Because you have also not shared any code that would even give us a clue.

For example, this post of yours. How am I supposed to know the way you want to send the data to the PHP page? I would always go with jQuery's ajax techniques. They can send the data to a web page, where you can handle it like an ordinary request.

But, best way is to keep it one thread, one question way. This way, not just you but other readers are able to get a good answer. That said, you should first of all consider trying to Google for a solution. Google has a solution to almost 99% of problems. I personally get a solution to my problems by Google! :-)