问题
I added onkeyup javascript for a dynamically added textbox in javascript... But it doesnt seem to work....
var cell4 = row.insertCell(3);
cell4.setAttribute('align','center')
var e3 = document.createElement('input');
e3.type = 'text';
e3.name = 'txtqt' + iteration;
e3.id = 'txtqt' + iteration;
e3.onkeyup = totalAmount(event,this,'tblsample');//Adding this lines doesnt work
e3.size = 10;
cell4.appendChild(e3);
But when i used
e3.onkeyup = totalAmount;
It worked... Here is my javascript function,
function totalAmount(e,obj,tblid) {
var tbl = document.getElementById(tblid);
//alert(tbl);
var tblRows = tbl.rows.length;
//alert(tblRows);
var result =0;
var str1;
if (obj != null) {
str1 = obj.id;
} else {
str1 = this.id;
}
var lastChar = str1.substring(5,str1.length);
//alert(lastChar);
if(str1=='txtqt'+lastChar)
{
var str2 = 'txtup'+lastChar;
var str3 = 'txtAmount'+lastChar;
var txtDeduct = document.getElementById(str1).value;
var txtAmt = document.getElementById(str2).value;
var txtTotal = document.getElementById(str3);
var totRes = txtAmt*txtDeduct;
//var res = formatNumber(totRes,2)
txtTotal.value = totRes.toFixed(2)
document.getElementById('txttotAmount').value = totRes.toFixed(2);
for(i=1;i<=tblRows;i++)
{
//alert(tblRows);
txtTotID = 'txtAmount'+i;
if(document.getElementById(txtTotID).value!='')
{
result =parseFloat(result) + parseFloat(document.getElementById(txtTotID).value);
//var res= formatNumber(result,2)
document.getElementById('txtTotalAmount').value = result.toFixed(2);
document.getElementById('txttotAmount').value = result.toFixed(2);
//document.getElementById('txtTotalAmount').value = result;
}
}
}
}
回答1:
You need to wrap your function call in an anonymous function:
e3.onkeyup = function(event){ totalAmount(event,this,'tblsample'); }
But an even better way to do it, to allow for cross browser compatibility would be to use an addEvent function:
function addEvent(obj,type,fn){
if (obj.addEventListener){
obj.addEventListener(type,fn,false);
} else if(obj.attachEvent){
obj["e"+type+fn]=fn;
obj[type+fn]=function(){
obj["e"+type+fn](window.event);
};
obj.attachEvent("on"+type,obj[type+fn]);
};
};
And then add the event using that function:
addEvent(e3,'keyup',function(event){ totalAmount(event,this,'tblsample'); });
Just a much better way to handle events. I would recommend you switch to this method.
回答2:
onkeyup
is a function. If you pass it the return value of totalAmount(event,this,'tblsample');
it won't work (unless it returns a function).
e3.onkeyup = totalAmount;
is probably enough.
then inside totalAmount..
function totalAmount(event) {
alert(this); // this is the e3 object
}
So if you need the this
and the 'tblsample' arguments, I suggest you add them to the e3 object so that you can access them through the this
keyword inside the totalAmount function:
e3.otherScope = this;
e3.tblid = 'tblsample;
e3.onkeyup = totalAmount;
and..
function totalAmount(event) {
alert(this); // this is the e3 object
alert(this.otherScope); // the `this` object in the other scope
alert(this.tblid); // 'tblsample'
}
Or you can simply just do
var otherScope = this;
e3.onkeyup = function(event) {
totalAmount(event, otherSope, 'tblsample');
};
来源:https://stackoverflow.com/questions/2333881/javascript-event-doesnt-seem-to-get-added-to-a-dynamically-generated-textbox