javascript - how to getElementByID() when the id is a php variable? - Stack Overflow

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For example:

<?php  foreach($something as $anotherthing){  ?>
    <span id="<?php echo $product_id; ?>"><?php echo $price; ?></span>

    <?php if($option == 'select') { ?>
    <select name="joe" id="<?php echo $select_id; ?>" > ......

I have no idea how to get the id's into javascript.

For example:

<?php  foreach($something as $anotherthing){  ?>
    <span id="<?php echo $product_id; ?>"><?php echo $price; ?></span>

    <?php if($option == 'select') { ?>
    <select name="joe" id="<?php echo $select_id; ?>" > ......

I have no idea how to get the id's into javascript.

• php
• javascript
• getelementbyid

Share Improve this question Follow asked Oct 11, 2012 at 10:16 tora0515tora0515 2,5471212 gold badges3434 silver badges4141 bronze badges

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4 Answers 4

Sorted by: Reset to default 7

HTML is text. JavaScript is text. So - the same way.

getElementById('<?php echo $product_id; ?>');

The same way as in HTML :

document.getElementByID('<?php echo $id?>');

Suggestion, either use $_SESSION or put the variable into a hidden input field that always has the same name, then you can get the value from there and use it as the ID :)

Given you use a syntax similar to product-N or product[N] if you only have a want all products on the page:

document.querySelectorAll('[id^=product]');

if you want just one of those you can use only the first match add [0] just before the ;

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