I have a simple bit of jQuery below which is working as expected. I would however like to change it so if the number is positive it turns green and if it is negative it turns red. I know the CSS part and so the styling isn't an issue. I am just unsure how to add the class depending on the result.
<script type="text/javascript">
jQuery(function($) {
$("#cost_price").on("keyup",function() {
var totalcost= $("#_regular_price").val() - $(this).val()
$(".total_cost").html(totalcost);
})
})
</script>
您可以使用三元语句:
totalcost < 0 ? $(".total_cost").addClass("negative") : $(".total_cost").addClass("positive")
It should be as simple as:
var $totalCost = $(".total_cost");
if(totalCost < 0) {
$totalCost.removeClass("green").addClass("red");
} else {
$totalCost.removeClass("red").addClass("green");
}
$totalCost.html(totalCost);
you have a .negative class that sets it to red then Javascript applies it or not
$("#cost_price").on("keyup",function(){
var totalcost= $("#_regular_price").val() - $(this).val()
$(".total_cost").html(totalcost);
if(totalcost < 0) $(this).addClass("negative");
else $(this).removeClass("negative");
});
One approach:
$(".total_cost").html(totalcost).addClass(Math.abs(totalCost) === totalCost ? 'positive' : 'negative');
References:
addClass()
. Math.abs()
. parseFloat()
. if(totalcost >= 0){
if($(".total_cost").hasClass('red')
$(".total_cost").removeClass('red');
if(!$(".total_cost").hasClass('green')
$(".total_cost").addClass('green');
}
else{
if($(".total_cost").hasClass('green')
$(".total_cost").removeClass('green');
if(!$(".total_cost").hasClass('red')
$(".total_cost").addClass('red');
}
one simple way is to use css3's attrib matching, and a tiny bit of js to publish the value property to a real attribute :
<style> input[alt^='-'] { color: red; } </style>
<input oninput="this.alt=this.value" />
which shows red if the value starts with "-". you can use a type=number and min/max attribs to further improve the user interface.
tested in chrome, ff, and IE9. use onkeyup for IE8 compat.
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