Question

i am having a problem with javascript and i dont know how to solve it. i am having this code

function addtask(tab){
        var tasktag = document.createElement( tr );
        var task = document.getElementById(tab).getElementsByTagName( tr ).length+1;
        task = tab+ r +task;
        tasktag.setAttribute( id ,task);
        document.getElementById(tab).appendChild(tasktag);
        var tasktag2 = document.createElement( td );
        var task2 = document.getElementById(task).getElementsByTagName( td ).length+1;
        task2 = task+ c +task2;
                alert(task2);
        tasktag2.setAttribute( id ,task2);
        tasktag2.innerHTML =  +task2+    <br><input id= btn1  type= button  value= remove  onClick="removeElement(  +num+  , body )" /> ;
        document.getElementById(task).appendChild(task2);
}`

i get "Couldn t convert JavaScript argument arg 0 [nsIDOMHTMLTableRowElement.appendChild]"(from firebug). while this code works perfect

`var num;
function addlist(){
        var divTag = document.createElement( table );
        if(num==undefined){num = 1;}
        else{numi = num.split("t")
            num=parseInt(numi[1])+1;}
        num =  t +num;
        divTag.setAttribute( id ,num);
        divTag.setAttribute( align , left ); 
        divTag.setAttribute( style , margin:7px; ); 
        divTag.setAttribute( border ,1); 
        document.body.appendChild(divTag);
        var divTag2 = document.createElement( tr );
        var num2 = document.getElementById(num).getElementsByTagName( tr ).length+1;
        num2 = num+ r +num2;
        divTag2.setAttribute( id ,num2);
        document.getElementById(num).appendChild(divTag2);
        var divTag3 = document.createElement( td );
        var num3 = document.getElementById(num2).getElementsByTagName( td ).length+1;
        num3 = num2+ c +num3;
        divTag3.setAttribute( id ,num3);
        divTag3.innerHTML =  +num+    <br><input id= btn1  type= button  value= remove  onClick="removeElement(  +num+  , body )" /><br><input id= btn2  type= button  value= task  onClick="addtask(  +num+  )" /> ;
        document.getElementById(num2).appendChild(divTag3);
    }

为什么发生这种情况? 谢谢大家的时间

Answer 1

When working with tables, you have to use slightly different JavaScript functions:

var row = table.insertRow(table.rows.length);
row.id = ...;

Try re-working their Code to use insertRow und appendChild, as I am lazy.

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