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先说一些细节:

我有 4 个图像占位符。我有几个复选框。每个复选框都与一个图像相关联。用户可以勾选 4 个复选框。

当用户单击一个复选框时,它会用与该复选框相关联的图像替换其中一个图像占位符。

在用户选中 4 个复选框后,其余复选框将被禁用。

所以现在我们有 4 个图像占位符,其中填充了选中复选框中的图像。

这就是我的问题发挥作用的地方。

如果用户决定取消选中一个框,我需要正确的占位符图像才能返回到它的通用占位符图像。

因此,如果用户选中的 4 个复选框是 1:锤子 2:螺丝刀 3:钉子 4:锯子。这 4 个占位符图像将填充有锤子、螺丝刀、钉子和锯子。如果他们决定取消选中螺丝刀复选框,那么带有螺丝刀的占位符图像应切换到通用占位符图像。

我很难弄清楚如何做到这一点。

提前致谢!

function countChecked() {  

    var radioCandyCount = document.getElementsByName('HowManyCandies');

             for (var i = 0, length = radioCandyCount.length; i < length; i++) {
                if (radioCandyCount[i].checked) {

                var a = radioCandyCount[i].value;
                var b = "2";
                var c = Number(a) + Number(b);



        var n = $("input:checked").length; 

        document.getElementById("CandyCount").value = Number(c) - Number(n)

// 不起作用 ....此部分是将占位符图像恢复为其通用图像...不起作用

        if (document.getElementById("CandyCount").value == 4) {
            $('#Jar1').css("background-image", "url(/Images/SingleJar.png)");
            $('#Jar2').css("background-image", "url(/Images/SingleJar.png)");
            $('#Jar3').css("background-image", "url(/Images/SingleJar.png)");
            $('#Jar4').css("background-image", "url(/Images/SingleJar.png)");


        }
        if (document.getElementById("CandyCount").value == 3) {

            if ($(this).not(':checked')) {                

                var unChecked = this.value;                




                if ($('#Jar1').css("backgroundImage") == "url(\"/Images/" + unChecked + ".png\"" + ")");
                {
                    $('#Jar1').css("background-image", "url(/Images/SingleJar.png)");
                }
                if ($('#Jar2').css("backgroundImage") == "url(\"/Images/" + unChecked + ".png\"" + ")");
                {
                    $('#Jar2').css("background-image", "url(/Images/SingleJar.png)");
                }
                if ($('#Jar3').css("backgroundImage") == "url(\"/Images/" + unChecked + ".png\"" + ")");
                {
                    $('#Jar3').css("background-image", "url(/Images/SingleJar.png)");
                }
            }


        }
        if (document.getElementById("CandyCount").value == 2) {

            if ($(this).not(':checked')) {

                var unChecked = this.value;

                if ($('#Jar1').css("backgroundImage") == "url(\"/Images/" + unChecked + ".png\"" + ")");
                {
                    $('#Jar1').css("background-image", "url(/Images/SingleJar.png)");
                }
                if ($('#Jar2').css("backgroundImage") == "url(\"/Images/" + unChecked + ".png\"" + ")");
                {
                    $('#Jar2').css("background-image", "url(/Images/SingleJar.png)");
                }

            }


        }
        if (document.getElementById("CandyCount").value == 1) {

            if ($(this).not(':checked')) {


                var unChecked = this.value;


                if ($('#Jar1').css("backgroundImage") == "url(\"/Images/" + unChecked + ".png\"" + ")");
                {                       
                    $('#Jar1').css("background-image", "url(/SingleJar.png)");
                }

            }


        }

                    // *****END**** THIS SECTION IS TO REVERT THE PLACE HOLDER IMAGES BACK TO ITS GENERIC IMAGE *****END****


                    // THIS SECTION CHANGES THE PLACE HOLDER IMAGE BASED ON THE ASSOCIATED CHECKBOX IMAGE

        if (length == 3) {
            if (document.getElementById("CandyCount").value == 3) {
                $(':checkbox(:checked)')                    
                    if (this.checked) {                         
                        var CandyChoice = "url(" + "/Images/" + this.value + ".png )";                           
                        $('#Jar4').css("background-image", CandyChoice);
                    }

            }
            if (document.getElementById("CandyCount").value == 2) {
                $(':checkbox(:checked)')                    
                if (this.checked) {   
                        var CandyChoice = "url(" + "/Images/" + this.value + ".png )";                            
                        $('#Jar3').css("background-image", CandyChoice);
                    }

            }
            if (document.getElementById("CandyCount").value == 1) {
                $(':checkbox(:checked)')                    
                if (this.checked) {   
                        var CandyChoice = "url(" + "/Images/" + this.value + ".png )";                           
                        $('#Jar2').css("background-image", CandyChoice);
                    }

            }
            if (document.getElementById("CandyCount").value == 0) {
                $(':checkbox(:checked)')                    
                if (this.checked) {   
                        var CandyChoice = "url(" + "/Images/" + this.value + ".png )";                            
                        $('#Jar1').css("background-image", CandyChoice);
                    }

            }
        }

                    // *****END****  THIS SECTION CHANGES THE PLACE HOLDER IMAGE BASED ON THE ASSOCIATED CHECKBOX IMAGE  *****END**** 

         if (n == c)                                              
            {                                                        
                  $(':checkbox:not(:checked)').prop('disabled', true);

                 document.getElementById('AddCart').style.display = 'inline';
                  $(document).scrollTop( $("#AddCart").offset().top );
                   $("#StepFourCheck").fadeIn('slow'); 

             }                                                        
         else                                                     
             {                                                        
           $(':checkbox:not(:checked)').prop('disabled', false); 

           document.getElementById('AddCart').style.display = 'none';
           document.getElementById('StepFourCheck').style.display = 'none';



            }
            }
            }
            }
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