Below is a function to convert value A
when value B
is entered and vice versa.
I am trying to work out an efficient way to target only the nearest matching input using javascript or jQuery .
I've tried jQuery siblings , closest , prev and find .
Using Javascript what is an efficient way to target an element in an adjacent cell without the search function becoming convoluted?
HTML
<td><input class="A" value="0" OnChange="convertA(this.id, this.value);"/></td>
<td><input class="B" value="0" OnChange="convertB(this.id, this.value);"/></td>
JQUERY
function convertA(id, value) {
$('.B').val(value * 2);
}
function convertB(id, value) {
$('.A').val(value / 2);
}
using jquery only
$("input").change(function() {
var n = this.value;
if ($(this).hasClass("B")) {
n = this.value / 2;
} else {
n = this.value * 2;
}
$(this).closest("td").siblings().find("input").val(n);
});
*
Your main issue is because the this
keyword does not reference the element that raised the event when you attach your event handlers via attributes. You can get around this by attaching your events in JS instead.
You can then use closest()
to find the parent tr
element, and find()
the related input
within that row. Try this:
<tr>
<td><input class="A" value="0" /></td>
<td><input class="B" value="0" /></td>
</tr>
$('.A').change(function() {
var id = this.id;
var value = this.value;
$(this).closest('tr').find('.B').val(value * 2);
});
$('.B').change(function() {
var id = this.id;
var value = this.value;
$(this).closest('tr').find('.A').val(value / 2);
});
Since you are using jQuery use it for event handles as well
jQuery(function($) { //use jQuery event handlers $('.A').change(function() { //find the element in the same row and update $(this).closest('tr').find('.B').val((this.value / 2) || 0) }); $('.B').change(function() { $(this).closest('tr').find('.A').val((this.value * 2) || 0) }); })
<script src="http://code.jquery.com/jquery-latest.min.js"></script> <table> <tr> <td> <input class="A" value="0" /> </td> <td> <input class="B" value="0" /> </td> </tr> <tr> <td> <input class="A" value="0" /> </td> <td> <input class="B" value="0" /> </td> </tr> </table>
You can try this:
$(document).ready(function(){
$(".A").on("input", function(){
$(this).closest("tr").find("input.B").val(eval($(this).val()*2));
});
$(".B").on("input", function(){
$(this).closest("tr").find("input.A").val(eval($(this).val()/2));
});
});
$(".A, .B").on("keyup", function(){
$(this).hasClass("A") ? $(this).closest("tr").find(".B").val(this.value * 2) :
$(this).closest("tr").find(".A").val(this.value / 2);
});
Better to use more specific class names/identifiers though.
在相邻单元格中定位元素的最有效方法是使用.next()
方法...
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