The function Document.getElementsByName() behaves differently in Internet Explorer, returning an object, compared to Chrome where it returns

Question

The function Document.getElementsByName() behaves differently in Internet Explorer, returning an object, compared to Chrome where it returns

While trying to meet my requirements, I encountered a discrepancy between running the page in IE browser versus Chrome. The code worked successfully in IE, but not in Chrome.

for(var gridNo=0;gridNo < 30;gridNo++){

        var fldId = arry[0]+'_'+arry[1]+'_'+arry[2]+'_'+arry[3]+'_'+gridNo;

       var doc = document.getElementsByName(fldId);
       alert(doc);
       var doc1=doc;
        if(eval(doc)== null){
          alert("Oops....!");
          break;
        }

        alert("The value of the Element By Name "+doc1);
        alert("The value of the Element By Id"+document.getElementById(fldId));

var selectedDropDown = getSelectedDropDownValue(document.getElementsByName(fldId));
          alert("The Value is: "+selectedDropDown);
         if(parseInt(selectedDropDown) == 0){
             gridEmpCount = gridEmpCount + 1;
         }else if(parseInt(selectedDropDown) == 1){
             gridSpouseCount = gridSpouseCount + 1;
         }else if(parseInt(selectedDropDown) == 2){
             gridParentCount = gridParentCount + 1;
         }
     }

After some investigation, I realized that I need to utilize document.getElementById(). This solution works in IE, but fails in Chrome. Please assist me with this issue.

javascript

Answer 1

Answer №1

There are several issues in your code that need to be addressed. It is difficult to pinpoint which of these problems Internet Explorer is handling strangely, but it is common for IE to exhibit odd behavior when dealing with faulty code. The key to resolving this issue is to identify and remove the problematic sections in order to achieve consistent performance. Here are some of the errors present in your code:

document.getElementsByName() returns a list, not null, or a single object. If no DOM elements match the specified name, the list may be empty.
The condition if(eval(doc) == null) is incorrect syntax. Even if doc were null, the code would still fail to execute correctly. A suitable replacement could be if (!doc || !doc.length), potentially simplified to just if (!doc.length).
If you specifically want the first element matching the name (assuming there is always at least one), use:
```
getSelectedDropDownValue(document.getElementsByName(fldId)[0])
```
Your code inconsistently uses
```
document.getElementsByName(fldId)
```
and document.getElementById(fldId). Are you intending to reference the same identifier as both a name and an ID? Retrieving by ID will return a single DOM object, whereas fetching by name will yield a list of objects.
For compatibility with pre-IE 9 versions, always provide the radix as the second argument to parseInt(), as omitting it can lead to inaccuracies in interpretation, especially with leading zeros in the string.

Your explanation of the desired outcome was incomplete, however, here is a refined version of your code snippet:

var fldBase = arry[0] + '_' + arry[1] + '_' + arry[2] + '_' + arry[3] + '_';
for (var gridNo = 0; gridNo < 30; gridNo++) {

    var fldId =  fldBase + gridNo;
    var doc = document.getElementsByName(fldId);
    if (!doc || !doc.length) {
        alert("Oops....!");
        break;
    }

    // Utilize doc[0] to access the first item with the corresponding name
    var selectedDropDown = parseInt(getSelectedDropDownValue(doc[0]), 10);
    alert("The Value is:" + selectedDropDown);
    if (selectedDropDown == 0) {
        gridEmpCount = gridEmpCount + 1;
    } else if (selectedDropDown == 1) {
        gridSpouseCount = gridSpouseCount + 1;
    } else if (selectedDropDown == 2) {
        gridParentCount = gridParentCount + 1;
    }
}

Answer 2

There are several issues in your code that need to be addressed. It is difficult to pinpoint which of these problems Internet Explorer is handling strangely, but it is common for IE to exhibit odd behavior when dealing with faulty code. The key to resolving this issue is to identify and remove the problematic sections in order to achieve consistent performance. Here are some of the errors present in your code:

document.getElementsByName() returns a list, not null, or a single object. If no DOM elements match the specified name, the list may be empty.
The condition if(eval(doc) == null) is incorrect syntax. Even if doc were null, the code would still fail to execute correctly. A suitable replacement could be if (!doc || !doc.length), potentially simplified to just if (!doc.length).
If you specifically want the first element matching the name (assuming there is always at least one), use:
```
getSelectedDropDownValue(document.getElementsByName(fldId)[0])
```
Your code inconsistently uses
```
document.getElementsByName(fldId)
```
and document.getElementById(fldId). Are you intending to reference the same identifier as both a name and an ID? Retrieving by ID will return a single DOM object, whereas fetching by name will yield a list of objects.
For compatibility with pre-IE 9 versions, always provide the radix as the second argument to parseInt(), as omitting it can lead to inaccuracies in interpretation, especially with leading zeros in the string.

Your explanation of the desired outcome was incomplete, however, here is a refined version of your code snippet:

var fldBase = arry[0] + '_' + arry[1] + '_' + arry[2] + '_' + arry[3] + '_';
for (var gridNo = 0; gridNo < 30; gridNo++) {

    var fldId =  fldBase + gridNo;
    var doc = document.getElementsByName(fldId);
    if (!doc || !doc.length) {
        alert("Oops....!");
        break;
    }

    // Utilize doc[0] to access the first item with the corresponding name
    var selectedDropDown = parseInt(getSelectedDropDownValue(doc[0]), 10);
    alert("The Value is:" + selectedDropDown);
    if (selectedDropDown == 0) {
        gridEmpCount = gridEmpCount + 1;
    } else if (selectedDropDown == 1) {
        gridSpouseCount = gridSpouseCount + 1;
    } else if (selectedDropDown == 2) {
        gridParentCount = gridParentCount + 1;
    }
}

The function Document.getElementsByName() behaves differently in Internet Explorer, returning an object, compared to Chrome where it returns

Answer №1

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