I have a series of fields created dynamically based on database records. They will be named cardObject1, cardObject2, and so on for as many rows as necessary. I'm now trying to access a specific cardObject field in a function where the number is passed in, but am getting an error message.
The field looks like this:
<input name="cardObject241" value="2,$25.00,1" type="hidden">
The js code I'm using looks like this:
function deleteFromCart(id){
if (confirm("Are you sure you want to delete this item from your cart?")){
var voucherNbr = document.getElementById("voucherNbr").value;
var cardObjectArray = document.getElementById("cardObject"+id).value.split();
var amtToDelete = cardObjectArray[1];
alert("need to delete " + amtToDelete);
}
}
And the error I'm getting is
document.getElementById("cardObject" + id) is null
on this line:
var cardObjectArray = document.getElementById("cardObject"+id).value.split();
How can I get a handle to the cardObject field that ends with the number passed in as the id param?
您需要添加一个与名称属性同名的id =“”属性。
<input id="cardObject241" name="cardObject241" value="2,$25.00,1" type="hidden">
Firstly, your input field needs an id as well as a name, so it would look like this:
<input name="cardObject241" id="cardObject241" value="2,$25.00,1" type="hidden">
Secondly, if you have an object that may or may not exist, it's always a good idea to check for existence before you start manipulating properties:
var tempObj=document.getElementById("cardObject"+id)
if(tempObj) {
var cardObjectArray = tempObj.value.split();
...do your stuff with cardObjectArray....
}
您可以使用document.getElementsByName()
或(跨浏览器返回石器时代)
document.forms[formIndexOrName].elements["cardObject" + id].value.split(",")
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