How to convert JavaScript variable value into PHP variable

Question

I actually need to get count of HTML table rows (<tr>). Using JavaScript I have easily got the count of the table rows but now I actually want to use that count in a PHP variable which I am unable to do. Please kindly help me.

JavaScript runs in the browser, on the client. PHP runs on the server. I'm not sure what you're trying to achieve. You can use AJAX to send data from JavaScript to the server. — James Allardice
– James Allardice, Commented Jul 14, 2012 at 9:09
Read up on AJAX. You need to send your data to a PHP script on the server. You cant't just "convert" a JavaScript variable to a PHP variable. — James Allardice
– James Allardice, Commented Jul 14, 2012 at 9:11

jfriend00 · Accepted Answer · 2012-07-14 09:35:55Z

3

Your javascript is in the browser. Your PHP is on the server. To get this count into your PHP on the server, you have several options:

You can make an ajax call to the server and pass the table row count from the browser to your server.
If you are requesting a new page, you can encode the row count in the URL with a URL parameter ?rowCnt=49 on the end of the URL which you would parse out of the URL in your PHP.
If you are just making a straight request of the server which will load a new page, you can also do a Post and send the data with the post (similar to the previous option which is a GET instead of a POST).
If the row count is just in the HTML that was originally generated by your PHP on the server, then you can use some server-side logic to calculate what that rowcnt is using the same logic that generated the page in the first place.

edited Jul 14, 2012 at 9:35

answered Jul 14, 2012 at 9:11

jfriend00

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3 Comments

Junaid Akhtar Over a year ago

Send me ajax code for connection between Database or refer link

jfriend00 Over a year ago

@user1525293 - That isn't how this site works. We don't just send you code. I'd suggest you Google ajax and do some reading on your own and then ask much more specific questions if there's something you don't understand. There are millions of pages written about it as it's a widely used web capability. It's easiest to use if you use a library that does some of the gruntwork for you (like jQuery or many others).

Mahn Over a year ago

Too bad comments can't be downvoted. (In reference to OP's comment)

Sudarshan G Hegde · Accepted Answer · 2018-05-16 18:07:11Z

3

This will convert js variable to php variable and php variable to js variable

<script>
function jstophp(){


var javavar=document.getElementById("text").value;  

document.getElementById("rslt").innerHTML="<?php 
$phpvar='"+javavar+"'; 
echo $phpvar;?>";
}

function phptojs(){

var javavar2 = "<?php 

$phpvar2="I am php variable value";
echo $phpvar2;

?>";
alert(javavar2);
}

</script> 
<body>
<div id="rslt">
</div>


<input type="text" id="text" />
<button onClick="jstophp()" >Convert js to php</button>
<button onClick="phptojs()">Convert php to js</button>

PHP variable will appear here:
<div id="rslt2">
</div>

</body>

edited May 16, 2018 at 18:07

user9081669

answered Mar 15, 2013 at 19:08

Sudarshan G Hegde

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1 Comment

Shivam Bhalla Over a year ago

What if I just want jstophp() to return a PHP variable which I can then use in my HTML code ? How do I do that ?

user961954 · Accepted Answer · 2012-07-14 09:19:01Z

0

I think that you are trying to read the row count in PHP. So you may want to try using a input field for e.g.

Add this to HTML

<input type="hidden" id="rowCount"/>

in JS code

<script>
var objInputFieldRowCount = docuement.getElemendbyId("rowCount");
var jsRowCount = table.getElementsByTagName("TR").length;
objInputFieldRowCount.value = jsRowCount;
</script>

answered Jul 14, 2012 at 9:19

user961954

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2 Comments

Junaid Akhtar Over a year ago

not working as i am calling like this $hidden = $_POST['hidden'];

user961954 Over a year ago

try doing this $rowCount= $_POST['rowCount'];

ZosoOfZep · Accepted Answer · 2012-07-14 11:06:46Z

I have include a simple object that allows you to send data to a PHP script. The POST in synchronous to keep it simple. I have also includes a simple php script that will read the data.

var phpSend = phpSend || 
{
    sent: false,
    xmlhttp: null,
    xmlhttpstatus:null ,


    // You would call this function when you need to send your data
    sendInfo: function()
    {

            // Your Data
            var tableData = "&tableRowCount=" + yourTableRowCount ;

            // The url where the php file is situated
            var httpstring =  'http://www.mywebsite.com/php/table.php' ;


            phpSend.ContactXMLHttpRequest(httpstring,tableData) ;


            // Check to see if http request for table was OK
            if(phpSend.xmlhttpstatus == true)
            {
                // Do something here

            }


    },

    ContactXMLHttpRequest: function(url,data)
    {
        if (phpSend.xmlhttp)
        {
            phpSend.xmlhttp.onreadystatechange=phpSend.stateChanged;
            phpSend.xmlhttp.open("POST",url,false);
            phpSend.xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
            phpSend.xmlhttp.send(data);
        }
    },

    stateChanged: function()
    {   
        if(phpSend.xmlhttp.readyState==4)
        {
            if (phpSend.xmlhttp.status==200)
            {
                phpSend.xmlhttpstatus = true ;
            }
            else
            { 
                    phpSend.xmlhttpstatus = false ;
            }
        }
    },


    InitXMLHttpRequest: function()
    {
        if (window.XMLHttpRequest)
        {
            // code for IE7+, Firefox, Chrome, Opera, Safari
            return new XMLHttpRequest();
        }

        if (window.ActiveXObject)
        {
            // code for IE6, IE5
            return new ActiveXObject("Microsoft.XMLHTTP");
        }

        alert ('Your browser does not support XMLHTTP!');

        return null;
    }           

} ;

//-----------------------------------------------------------------------------------------------------------------------
//
//  Run on load
//
//-----------------------------------------------------------------------------------------------------------------------
(function()
{   
    phpSend.xmlhttp=phpSend.InitXMLHttpRequest();

})() ;






//-----------------------------------------------------------------------------------------------------------------------
//
//  PHP code that will be sitting on your server (for this example, 'http://www.mywebsite.com/php'  and called 'table.php')
//
//-----------------------------------------------------------------------------------------------------------------------

<?php
        // Pick up the count and do what you need to do
        $count = $_POST["tableRowCount"]; 
?>

AGE · Accepted Answer · 2016-01-22 16:17:27Z

0

Best Example convert JavaScript value to PHP:

JavaScript

<script type="text/javascript">
    var ja =50;
</script>

PHP

<?php 
    $dummy = "<script>document.write(ja)</script>";
    echo $dummy; 
?>

edited Jan 22, 2016 at 16:17

AGE

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answered Jan 22, 2016 at 11:48

Vikas kumar

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