PHP Variable Seen in Javascript

Question

I am trying to load some select options by using a few JS functions. I want to have one option selected by default if it is equal to a PHP variable defined before.

I receive an error:

Unexpected token

and I am sure I am doing something wrong with the syntax:

This is a section of my JS functions:

for(var i = 0; i < categories.length; i++){
          select.options[i] = new Option(categories[i].val,categories[i].id);   
          if (select.options[i].text== <?php echo '$categoriesSelect'; ?>)
            {
              select.options[i].selected=true;
            }       
        }

The variable $categoriesSelect is defined before the JS. Thank you!

remove the quote marks in: "json_encode($categoriesSelect)" — CD001
– CD001, Commented Jun 21, 2016 at 9:19
What does the $categoriesSelect variable contain, since you pass it through json_encode() (which will return a json object, and not a single value)? — M. Eriksson
– M. Eriksson, Commented Jun 21, 2016 at 9:21
Is the example code you've posted what is output by the PHP page? — evolutionxbox
– evolutionxbox, Commented Jun 21, 2016 at 9:21

M. Eriksson · Accepted Answer · 2016-06-21 09:41:41Z

8

You need to quote your strings.

Change (from your comment):

if (select.options[i]== <?php echo "json_encode($categoriesSelect)"; ?>)

to:

if (select.options[i].text == "<?php echo $categoriesSelect; ?>")

This will validate against the text for the option. Change .text to .value to validate against value for the option.

...also removed json_encode() since the variable only contains a string.

edited Jun 21, 2016 at 9:41

answered Jun 21, 2016 at 9:30

M. Eriksson

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1 Comment

Ruslan Bes Over a year ago

Also select.options[i].text should be instead of just select.options[i]

Thomas · Accepted Answer · 2016-06-21 09:32:42Z

2

You need to remove quotes around php function:

From

if (select.options[i].text== <?php echo '$categoriesSelect'; ?>)

To

if (select.options[i].text== '<?php echo $categoriesSelect; ?>')

edited Jun 21, 2016 at 9:32

answered Jun 21, 2016 at 9:30

Thomas

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