Jquery not focusing on the correct fields - php

Question

I am trying to have the focus in my isbn text box or the edition text boxafter running a calculation in jquery, but instead it is going to the first button on the page or the sales rank field.
My html is:
<td><label>ISBN</label></td>
<td><input type="text" id="isbn" name="isbn" /></td>
<td></td>
<td rowspan=7><a id="detailURL" href="#" target="_blank"><img id="bookCover" src="../images/imgNotFound.gif" height="200px" /></a></td>
<td rowspan=7><input type="button" id="isIE" name="isIE" value="IE Price Reduction" />
<br/><br/><input type="button" id="isAIE" name="isAIE" value="AIE Price Reduction" />
<br/><br/><input type="button" id="isModHighlight" name="isModHighlight" value="Moderate Highlighting" />
<br/><br/><input type="button" id="isHeavHighlight" name="isHeavHighlight" value="Heavy Highlighting" />
<br/><br/><input type="button" id="isMissingSupply" name="isMissingSupply" value="Missing Supply" />
<br /><br/><input type="button" id="waterDamage" name="waterDamage" value="Water Damage / Poor Cond." />
</td>
<td rowspan=7>
<!-- SUPPLY CHECK TABLE -->
<table id="supply" summary="Check Supply" width="10%" border="1" align="right">
<caption><h3>Check Supply!</h3></caption>
<thead>
<tr>
<th scope="col" class="rounded-isbn">Supply:</th>
<!--<th scope="col" class="rounded-isbn">Who Requires:</th>-->
</tr>
</thead>
<tbody>
</tbody>
</table>
</td>
</tr>
<tr>
<td><label for="quantity" class="label">Quantity</label></td>
<td><input type="text" id="quantity" name="quantity" /></td>
<td></td>
</tr>
<tr>
<td><label for="payPrice" class="label">Price to Pay</label></td>
<td><input type="text" id="payPrice" name="payPrice"/></td>
<td></td>
</tr>
<tr>
<td><label>Edition</label></td>
<td><input type="text" id="edition" name="edition" readonly="readonly"/></td>
<td></td>
</tr>
<tr>
<td><label>Title</label></td>
<td><input type="text" id="title" name="title" /></td>
<td></td>
</tr>
<tr>
<td><label>Sales Rank</label></td>
<td><input type="text" id="salesRank" name="salesRank" readonly="readonly" /></td>
<td></td>
</tr>
<tr>
<td></td><td><input type="button" id="buy" value="Buy" /></td><td></td>
</table>
</form>
The jquery in question is:
if($('#payPrice').val() <= 0 ) {
$(':text')[0].focus();
} else {
$("#edition").focus();
}
When the value of #payPrice is <=0, it is defaulting to the first button id="isIE" and not the isbn field. If the value of #payprice is >0 it is focusing on the sales rank text area, and not edition. I have tried setting a timeout, which did not work as well as $("#isbn).focus();, which didn't work either. I changed it to $(':text')[0].focus(); to see if that would work, but it still went to the first button.
What am I doing wrong here? How do I correct this to make it work as it should?

Answer 1

have you tried
if(parseFloat($('#payPrice').val()) <= 0 ) {
...
}
if parseFloat make no difference try this:
if($('#payPrice').val()<=0){
$("input[name='isbn']").focus();
}else{
$("input[name='edition']").focus();
}
otherwise you could see that example:
function sampledFunction()
{
window.setTimeout(function ()
{
$('#mobileno').focus();
}, 0);
return false;
}
read here

Answer 2

I'd recommend using a better selector:
like $('[type=text]') or $('input:text')
See: jQuery text selector

Answer 3

Here is the final outcome, thanks to JackTurky who pointed me in the right direction.
//focus on either isbn or edition
setTimeout(function() {
if($('#payPrice').val() <= 0 ) {
$("#isbn").focus();
} else {
$("#edition").focus();
}
}, 10);