Concatenation php string to javascript string

Question

I have some question about concatenation php string to javascript string ...

for example:

php variable

$man = "Jamse";

and have javascript function

<script>
    if (document.getElementById("fname").value == "") {
        q = false;
        msg = <?php echo 'Please fill first name'.$formErrors['fname'].'\n' ?>;
    }
</script>

i want to do something like this can anyone help me ?

ElGavilan · Accepted Answer · 2014-03-21 15:39:06Z

6

alert('my name is: <?php echo $man; ?>' );

answered Mar 21, 2014 at 15:39

ElGavilan

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7 Comments

VostanAzatyan Over a year ago

what can i do if i need to exactly concat it ?

ElGavilan Over a year ago

When your page is rendeded, <?php echo $man; ?> will be replaced with whatever is in $man; in this case the rendered output will be alert('my name is: Jamse' );

ElGavilan Over a year ago

@MikeChristensen That is a good point. If $man is populated via user input (via form, etc.) you will want to validate your input.

ElGavilan Over a year ago

The question as you have it now should work, assuming $formErrors is declared and has valid values.

ElGavilan Over a year ago

Just an aside, you may want to put in a space :) <?php echo 'Please fill first name '.$formErrors['fname'].'\n' ?>;

|

Mooseman · Accepted Answer · 2014-03-21 15:39:56Z

1

alert('my name is: <?= $man; ?>');

Since PHP will insert $man on the server side, it's not a separate string that must be combined by JS. All the browser will see is

alert('my name is: Jamse');

answered Mar 21, 2014 at 15:39

Mooseman

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Comments

user3147515 · Accepted Answer · 2014-03-21 15:42:33Z

1

Why not write it all in php?

<?php
$man = "Jamse";
echo "<script>
function alertMyName() {
    alert('my name is:" . $man . "');
}
</script>";
?>

answered Mar 21, 2014 at 15:42

user3147515

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2 Comments

user3147515 Over a year ago

@ElGavilan can you elaborate?

ElGavilan Over a year ago

It is better to leave the static parts of the HTML and javascript code in place and only use PHP to render the dynamic parts. Echoing the entire HTML is generally considered bad form as it makes your code harder to maintain and more prone to errors.

Brad Larson · Accepted Answer · 2014-03-24 17:18:55Z

0

The other answers are true, I just forgot to write quotes and javascript did not understand it was a String and gave me an error. The correct code:

   if (document.getElementById("fname").value == "") {
        q = false;
        msg = "<?php echo 'Please fill first name'.$formErrors['fname'].'\n'; ?>";
    }

edited Mar 24, 2014 at 17:18

Brad Larson

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answered Mar 21, 2014 at 16:07

VostanAzatyan

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2 Comments

David Makogon Over a year ago

Are you answering your own question? Or posting further info? It's hard to understand the sentence above the code (plus the sentence is part of the code block). If this is indeed an answer, please edit it to be readable. If it's additional info for your question, edit your question.

dcastro Over a year ago

@DavidMakogon I think he's just agreeing with the other answers, which told him to use quotes.

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