I am trying to place the PHP variable $e into HTML textbox id="textid" upon a button onclick. I have played around with various syntax, but I cannot seem to get it to work. What am I doing wrong?
<script type="text/javascript">
function ElementContent(id,content)
{
document.getElementById(id).value = content;
}
</script>
<input type="text" name="" value ="" id="textid" ;"/>
<?php
$e = "test";
echo '<button value="" class="button" onclick="ElementContent(\'textid\',\'$e\')" />';
?>
echo '<button value="" class="button" onclick="ElementContent(\'textid\',\''.$e.'\')" />Button Name</button>';
You have to concat the string, as php doesn't automatically recognise dollars+some name as a variable in single quote strings.
PHP variables will only be interpreted in strings constructed with double-quotes ("). Update your code as follows:
<button value="" class="button" onclick="ElementContent('textid', '<?php echo $e ?>')" />
As you can see, there's no need to output the whole button markup in PHP. Thus, your final code should be:
<script type="text/javascript">
function ElementContent(id,content) { document.getElementById(id).value = content; }
</script>
<input type="text" name="" value ="" id="textid" />
<?php $e = "test"; ?>
<button value="" class="button" onclick="ElementContent('textid', '<?php echo $e ?>')">Button</button>
I also took the time to fix a few issues with your markup, too.
<button>label</button>.