form.elements[...].checked is null or not an object error in Javascript

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form.elements[...].checked is null or not an object error in Javascript

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Forum Index » J2EE Application Development

Author

Message

[Post New]

11/26/2007 07:54:14

Subject: form.elements[...].checked is null or not an object error in Javascript

karl

Newbie

Joined: 01/07/2006 07:56:42
Messages: 38
Offline

I have a radio2 javascript function as below, it works like this..
When a parent radio button is selected only one of its child radio button can be selected and on selection of a new child button(of the same parent) the earlier child button is deselected.

When i navigate to this particular page and select a parent and select a child, when i select another child of the same parent the radio is selected and the below error is displayed:
form.elements[...].checked is null or not an object.

The pop-up says the below line is the error(line marked in bold in source code):
thisObj.form.elements[parentRadioButtonName].checked=true;

function sL_radio2_onclick(thisObj, thisEvent) {
	//use 'thisObj' to refer directly to this component instead of keyword 'this'
	//use 'thisEvent' to refer to the event generated instead of keyword 'event'
	// find the parent array number
	var indexStart = eval("form1:table1:".length);
	var indexEnd = thisObj.name.indexOf(':table2');
	var parentIndex = thisObj.name.substring(indexStart,indexEnd);
	// check the parent if child is checked and parent is not checked before
	parentRadioButtonName = 'form1:table1:'+parentIndex+':radio1';
	if (thisObj.checked && (!thisObj.form.elements[parentRadioButtonName].checked)) {
		[b]thisObj.form.elements[parentRadioButtonName].checked=true;[/b]
		//uncheck other parent
		for(i=0;1==1;i++){
	    	parentRadioButtonName = 'form1:table1:'+i+':radio1';
			if (thisObj.form.elements[parentRadioButtonName]) {
				//if this parent is checked and not the parent of current child
	            if(thisObj.form.elements[parentRadioButtonName].checked && (i != parentIndex)){
	            	thisObj.form.elements[parentRadioButtonName].checked=false;
					//uncheck children of this parent
	                 for(j=0;1==1;j++){
		                childRadioButtonName = 'form1:table1:'+i+':table2:'+j+':radio2';
	                    if(thisObj.form.elements[childRadioButtonName]){
	                        thisObj.form.elements[childRadioButtonName].checked=false;
	                    } else {
							break;
	              		}
		            }
				}
	      	} else {
				if (i>parentIndex) {
					break;
				}
			}
		}
		
	}
	//if this child is checked, uncheck other children 
	//  which has same parent as this child
	if (thisObj.checked) {
		for(i=0;1==1;i++){
	   		childRadioButtonName = 'form1:table1:'+parentIndex+':table2:'+i+':radio2';
	    	if(thisObj.form.elements[childRadioButtonName]){
				//check this child is not itself
				if (!(thisObj.form.elements[childRadioButtonName]==thisObj)) {
		       		thisObj.form.elements[childRadioButtonName].checked=false;
				}
	    	} else {
				break;
			}
		}
	}
}

This message was edited 1 time. Last update was at 11/26/2007 07:55:02

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