How to send variable value from php to js [duplicate]

Question

I want to send variable from php to js . I want to work this file like that js sends value php file then php works on this code and return again variable like true or false after that js controls and shows something users.I am Sorry for my poor English :D

<?php 

if(!empty($_POST['a']))
{
    $value=1;
    echo '{"a":"'.$value.'"}';
}
else
{
    ?>  
    <script src="assets/plugins/jquery-1.10.1.min.js" type="text/javascript"></script>
    <script src="assets/plugins/jquery-migrate-1.2.1.min.js" type="text/javascript></script>
    <script>
    function sendValue($page,$value)
    {
        $.post($page, $value , function(data)
        {
            if(data.a==1)
           {
                alert("its work");
           }
           else
           {
                alert("oh no Houston  we have a problem !!");
           }
    }
    )};
    </script>
    <a href="#"  onclick='sendValue("a.php",{a:"1"});' >blabla</a>
    <?php 
}
?>

What happens right now?

Austen
– Austen

2013-09-07 01:16:56 +00:00
Commented Sep 7, 2013 at 1:16 — Austen
– Austen, Commented Sep 7, 2013 at 1:16
problem is if(data.a==1).this a value undefined

user2756017
– user2756017

2013-09-07 01:22:21 +00:00
Commented Sep 7, 2013 at 1:22 — user2756017
– user2756017, Commented Sep 7, 2013 at 1:22

Ragnarokkr · Accepted Answer · 2013-09-07 01:36:13Z

1

str=$("input.classname").val();

or

str=$("input#idname").val();

it is inside js

and the easy way to send information by hidden input like this

<input type="hidden" class="classname" value="<?php echo "here the value you want to send"; ?>" />

edited Sep 7, 2013 at 1:36

Ragnarokkr

2,3182 gold badges21 silver badges32 bronze badges

answered Sep 7, 2013 at 1:21

Robert

2,9103 gold badges29 silver badges50 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user2756017 Over a year ago

this is good idea simple and easy.

James · Accepted Answer · 2013-09-07 01:32:53Z

If I understand correctly, you want to send data to PHP, then have PHP return data accordingly. Here is what I use to make an ajax call:

var sendData = "action=do_action";
sendData += "&value=" + $("input.value").val();

$.ajax({
    url: "post.php",//Page to send our data to
    global: false,
    type: "POST",
    data: sendData,
    dataType: "html",
    async:false,
    success: function(data){
        //We could return JSON and then just parse that, but I usually just return values like this

        //create jquery object from the response html
        var $response=$(data);

        var results = $response.filter('div.results').text();//Or .html() if we want to return HTML to show                     

        if (results == "true") {
            alert("it works");
        }else{
            var reason= $response.filter('div.reason').text();
            alert(reason);
        }
    }
});

And the PHP would look like:

<?php
    $action = $_POST['action'];

    if ($action == "do_action") {
        if (true) {
            echo "<div class='result'>true</div>";
        }else{
            echo "<div class='result'>false</div>";
            echo "<div class='reason'>Houston, we have a problem!</div>";
        }
    }
?>

Lajos Arpad · Accepted Answer · 2013-09-07 01:49:42Z

0

Which is the active directory in this case? Is it the one which contains a.php?

Also, you are sending back a string. You must convert that using JSON.parse().

Your response is a string, so it does not have an 'a'.

answered Sep 7, 2013 at 1:49

Lajos Arpad

80.5k42 gold badges124 silver badges235 bronze badges

1 Comment

user2756017 Over a year ago

can you give example i dont understand.

Collectives™ on Stack Overflow

How to send variable value from php to js [duplicate]

3 Answers 3

1 Comment

Comments

1 Comment

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

1 Comment

Linked

Related