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问题描述：
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在IE8及以下版本时，点击label标签无法自动触发checkbox的click事件，导致无法产生希望的效果。
原HTML代码：
$("input:checkbox[name='menu']").each(function (index, element) {
$(this).click(function () {
if ($(this).attr("checked") != undefined) {
$(this).removeAttr("checked");
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.forEach(function (val) {
//console.log(element.value);
if (element.value == val) {
arrMenues.splice($.inArray(val, arrMenues), 1);
}
});
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
} else {
$(this).attr("checked", "checked");
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.push($(this).val());
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
}
else {
menues += $(this).val() + ',';
}
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
})
});根本原因：因为ie8不支持事件传递，当点击蓝色的框框时，触发了label的click事件而并没有触发其中checkbox标签的click事件。
解决方式：我们可以修改html代码，将label标签和checkbox标签通过id属性关联，同时给label加上name属性，将事件处理放在label标签上。
新HTML代码：
$("label[name='lbl_menu']").each(function (index, element) {
$(this).click(function () {
//console.log($('input#chk_' + this.id).attr("checked"));
if ($('input#chk_' + this.id).attr("checked") != undefined) {
$('input#chk_' + this.id).removeAttr("checked");
//$('input#chk_' + this.id).trigger("click");
$('div').filter('.cbr-replaced.cbr-blue').eq(index).removeClass('cbr-checked');
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.forEach(function (val) {
//console.log(element.value);
if (element.value == val) {
arrMenues.splice($.inArray(val, arrMenues), 1);
}
});
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
} else {
$('input#chk_' + this.id).attr("checked", "checked");
// console.log($('input#chk_' + this.id).attr("checked"));
//$('input#chk_' + this.id).trigger("click");
// console.log($('.cbr-replaced.cbr-blue')[index]);
$('div').filter('.cbr-replaced.cbr-blue').eq(index).addClass('cbr-checked');
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.push($('input#chk_' + this.id).val());
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
}
else {
menues += $('input#chk_' + this.id).val() + ',';
}
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
})
});最后加一下IE版本的判断代码就完美了。
完整JS代码
var DEFAULT_VERSION = 8.0;
var ua = navigator.userAgent.toLowerCase();
var isIE = ua.indexOf("msie") > -1;
var safariVersion;
if (isIE) {
safariVersion = ua.match(/msie ([\d.]+)/)[1];
}
if (safariVersion <= DEFAULT_VERSION) {
$("label[name='lbl_menu']").each(function (index, element) {
$(this).click(function () {
//console.log($('input#chk_' + this.id).attr("checked"));
if ($('input#chk_' + this.id).attr("checked") != undefined) {
$('input#chk_' + this.id).removeAttr("checked");
//$('input#chk_' + this.id).trigger("click");
$('div').filter('.cbr-replaced.cbr-blue').eq(index).removeClass('cbr-checked');
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.forEach(function (val) {
//console.log(element.value);
if (element.value == val) {
arrMenues.splice($.inArray(val, arrMenues), 1);
}
});
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
} else {
$('input#chk_' + this.id).attr("checked", "checked");
// console.log($('input#chk_' + this.id).attr("checked"));
//$('input#chk_' + this.id).trigger("click");
// console.log($('.cbr-replaced.cbr-blue')[index]);
$('div').filter('.cbr-replaced.cbr-blue').eq(index).addClass('cbr-checked');
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.push($('input#chk_' + this.id).val());
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
}
else {
menues += $('input#chk_' + this.id).val() + ',';
}
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
})
});
}
else {
$("input:checkbox[name='menu']").each(function (index, element) {
$(this).click(function () {
if ($(this).attr("checked") != undefined) {
$(this).removeAttr("checked");
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.forEach(function (val) {
//console.log(element.value);
if (element.value == val) {
arrMenues.splice($.inArray(val, arrMenues), 1);
}
});
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
} else {
$(this).attr("checked", "checked");
var menues = $("#selmenues").val();
var arrMenues = menues.split(',');
if (arrMenues.length > 0) {
arrMenues.push($(this).val());
menues = "";
arrMenues.forEach(function (val) {
menues += val + ',';
});
menues = menues.substring(0, menues.length - 1)
//console.log(menues);
}
else {
menues += $(this).val() + ',';
}
$("#selmenues").val(menues);
//console.log($("#selmenues").val());
}
})
});
}总结
以上所述是小编给大家介绍的解决包含在label标签下的checkbox在ie8及以下版本点击事件无效果兼容的问题，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
