javascriptphphtmljsonconverters

Convert HTML Table to JSON file

Is it possible to convert a HTML table to JSON like this:

Name Gender Age
John M 18
Mike M 19

JSON:

{"Values" : {
    "1" : {
        "name": "John",
        "Gender": "M",
        "Age": "18"
    },
    "2": {
        "name": "Mike",
        "Gender": "M",
        "Age": "19"
    },
}}

I already have this code:

(function() {
    var jsonArr = [];
    var obj = {};
    var thNum = document.getElementsByTagName('th').length;
    var arrLength = document.getElementsByTagName('td').length;

    for(i = 0; i<arrLength;i++){
        if(i%thNum==0){
            obj = {};
        }
        var head = document.getElementsByTagName('th')[i%thNum].innerHTML;
        var content = document.getElementsByTagName('td')[i].innerHTML;
        obj[head] = content;
        if(i%thNum==0){
            jsonArr.push(obj);
        }   
    }           
    document.write("<br>"+JSON.stringify(jsonArr));
})();

The script converts this:

<!DOCTYPE html>
<TABLE border="3" rules="all" bgcolor="#E7E7E7" cellpadding="1" cellspacing="1">
<TR>
<TH align=center><font size="3" face="Arial">Date</font></TH>
<TH align=center><font size="3" face="Arial"><B>Teacher</B></font></TH>
<TH align=center><font size="3" face="Arial">?</font></TH>
<TH align=center><font size="3" face="Arial">Hour</font></TH>
<TH align=center><font size="3" face="Arial">Subject</font></TH>
<TH align=center><font size="3" face="Arial">Class</font></TH>
<TH align=center><font size="3" face="Arial">Room</font></TH>
<TH align=center><font size="3" face="Arial">(Teacher)</font></TH>
<TH align=center><font size="3" face="Arial">(Room)</font></TH>
<TH align=center><font size="3" face="Arial">XYY</font></TH>
<TH align=center><font size="3" face="Arial"><B>Information</B></font></TH>
<TH align=center><font size="3" face="Arial">(Le.) nach</font></TH>
</TR>
<TR><TD align=center><font size="3" face="Arial">24.9.</font></TD>
<TD align=center><font size="3" face="Arial"><B><strike>Dohe</strike></B></font></TD>
<TD align=center><font size="3" face="Arial">Free</font></TD>
<TD align=center><font size="3" face="Arial">1</font></TD>
<TD align=center><font size="3" face="Arial"><strike>Math</strike></font> </TD>
<TD align=center><font size="3" face="Arial">(9)</font> </TD>
<TD align=center><font size="3" face="Arial">---</font> </TD>
<TD align=center><font size="3" face="Arial"><strike>Dohe</strike></font></TD>
<TD align=center><font size="3" face="Arial">A001</font></TD>
<TD align=center>&nbsp;</TD>
<TD align=center>&nbsp;</TD>
<TD align=center><font size="3" face="Arial">Free.</font></TD>
</TR>
</TABLE>
<script>
(function() {
    var jsonArr = [];
    var obj = {};
    var thNum = document.getElementsByTagName('th').length;
    var arrLength = document.getElementsByTagName('td').length;
    
    for(i = 0; i < arrLength; i++){
        if(i%thNum === 0){
            obj = {};
        }
        var head = document.getElementsByTagName('th')[i%thNum].innerHTML;
        var content = document.getElementsByTagName('td')[i].innerHTML;
        obj[head] = content;
        if(i%thNum === 0){
            jsonArr.push(obj);
        }   
    }           
    document.write("<br>"+JSON.stringify(jsonArr));
})();
</script>
</body>
</html>

To this:

[{"Date":"24.9.","Teacher":"Dohe","?":"Free","Hour":"1","Subject":"Math ","Class":"(9) ","Room":"--- ","(Teacher)":"Dohe","(Room)":"A001","XYY":" ","Information":" ","(Le.) nach":"Free."}]

But I need the "Values" tag before and the "1", "2", which should be created automatically by row. And at least is it possible to write this into a new .json file like data.json?

Solution

  • If you want to represent the array of rows as an object, change jsonArr.push(obj) to jsonObj[++rowIx] = obj, where jsonObj has previously been initialized to {}, and rowIx is a counter that has been initialized to 0 (probably simpler than doing math on i).

    The expected output you posted is not valid JSON, so I'm assuming that it's supposed to be wrapped by another set of braces:

    document.write("<br>"+JSON.stringify({"Values": jsonObj}));

    As for saving to a file, this is tricky to do in a portable manner. There are several other answers that address this, including the following: