errorsk-4nQwBFp0LP8NpyK9WwwoT3BlbkFJyH23SKdFWR1P9Sr63sF8
最编程
2024-08-12 14:33:21
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1. 当表单里面只有一个checkbox复选框时,这时候很容易判断checkbox复选框是否被选中,如下实例:
<div id="divId" class="divTable">
<div class="tableBody">
<ul ><li ><input id="ck1" type="checkbox" value="501" ></li></ul>
</div>
</div>
<script>
if(document.getElementById("ck1").checked){
alert("checkbox is checked");
}
</script>
document.getElementById("ck1").checked用于获取id为ck1的复选框的checked属性值,如果为true表示复选框选中,否则没有被选中。
2。 当表单里有n个checkbox的时候,我们需要使用js遍历来分别判断每个checkbox复选框checked属性值, 如:
<input type="checkbox" id="cashbagSaveYN" name="cashbagSaveYN" value="" />
<input type="checkbox" id="cashbagSaveYN" name="cashbagSaveYN" value="" />
<input type="checkbox" id="cashbagSaveYN" name="cashbagSaveYN" value="" />
function ifChecked()
{
var a = document.getElementsByName("cashbagSaveYN");
var n = a.length;
var k = 0;
for (var i=0; i<n; i++){
if(a[i].checked){
k = 1;
}
}
if(k==0){
alert("请选中Checkbox!");
return;
}
}
document.getElementsByName("cashbagSaveYN")获取到HTML文档中的所以checkbox,结果为一个数组,数组的元素为每个checkbox对象,然后我们使用for遍历这个数组,分别判断每个checkbox的checked属性值,从而来获取checkbox复选框是否被选中。
再看一个实例,该实例也是演示javascript如何判断checkbox是否被选中的。
<html>
<form name="orderForm">
<input type="checkbox" name="door4">4 doors<br>
<input type="checkbox" name="door2">2 doors<hr>
<input type="button" value="Submit Order" name="orderButton" onClick="submitOrder()">
</form>
<script language="JavaScript">
function submitOrder() {
if((document.orderForm.door4.checked == true) && (document.orderForm.door2.checked == true)){
console.log("You selected two different door styles. Reselect door style.");
document.orderForm.door4.checked = false;
document.orderForm.door2.checked = false;
}else if((document.orderForm.door4.checked == false) && (document.orderForm.door2.checked == false)){
console.log("You did not select a door style! Please select a door style.");
} else {
var alertString = String("Order: ");
if(document.orderForm.door4.checked == true)
alertString += "4 doors.";
if(document.orderForm.door2.checked == true)
alertString += "2 doors.";
console.log(alertString);
}
}
</script>
</html>
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