Basically I want to update an Input field with the sum of all above Input Fields.
This is a part of HTML within tag:
<tr>
<td width="20%">Admission Fee:</td>
<td width="80%"><input onchange="findTotal()" type="text" class="input_box" name="admission_fee" id="fee" size="5" value="" maxlength="6" oninput="this.value = this.value.replace(/[^0-9]/, \'\');"></td>
</tr>
<tr>
<td width="20%">Annual Fee:</td>
<td width="80%"><input onchange="findTotal()" type="text" class="input_box" name="annual_fee" id="fee" size="5" value="" maxlength="6" oninput="this.value = this.value.replace(/[^0-9]/, \'\');"></td>
</tr>
<tr>
<td width="20%">Paper Money Fee:</td>
<td width="80%"><input onchange="findTotal()" type="text" class="input_box" name="paper_money_fee" id="fee" size="5" value="" maxlength="6" oninput="this.value = this.value.replace(/[^0-9]/, \'\');"></td>
</tr>
<tr>
<td width="20%">Monthly Fee:</td>
<td width="80%"><input onchange="findTotal()" type="text" class="input_box" name="monthly_fee" id="fee" size="5" value="" maxlength="6" oninput="this.value = this.value.replace(/[^0-9]/, \'\');"></td>
</tr>
<tr>
<td width="20%">Remaining Balance:</td>
<td width="80%"><input onchange="findTotal()" type="text" class="input_box" name="remaining_balance" id="fee" size="5" value="" maxlength="6" oninput="this.value = this.value.replace(/[^0-9]/, \'\');"></td>
</tr>
<tr>
<td class="school_trow2" width="20%">Total Fee:</td>
<td class="school_trow2" style="padding: 3px 0;" width="80%"><input type="text" class="input_box" style="background: #8CDFFF; border: 1px solid #006991; color: #000;" name="total_fee" id="total_fee" size="5" value="" disabled></td>
</tr>
And this is the Javascript I am Using:
<script type="text/javascript">
function findTotal()
{
var arr = document.getElementById(\'fee\');
var tot=0;
for(var i=0;i<arr.length;i++)
{
if(parseInt(arr[i].value))
{
tot += parseInt(arr[i].value);
}
}
document.getElementById(\'total_fee\').value = tot;
}
</script>
Any help would be appreciated.
This is what I've come up with.
<input type='text'
then checking for numbers using regex. A better approach would be to just use <input type='number'
maxlength
does not work on type='number'
, I have used max
to handle 6 digit limit. function findTotal() { const fees = document.querySelectorAll(".fee"); const total = document.querySelector("#total_fee"); let sum = 0; fees.forEach(fee => { if(fee.valueAsNumber){ sum += fee.valueAsNumber; } }); total.value = sum; }
<tr> <td width="20%">Admission Fee:</td> <td width="80%"><input onchange="findTotal()" type="number" class="input_box fee" name="admission_fee" value="" min='0' max='999999'></td> </tr> <tr> <td width="20%">Annual Fee:</td> <td width="80%"><input onchange="findTotal()" type="number" class="input_box fee" name="annual_fee" value="" min='0' max='999999'></td> </tr> <tr> <td width="20%">Paper Money Fee:</td> <td width="80%"><input onchange="findTotal()" type="number" class="input_box fee" name="paper_money_fee" value="" min='0' max='999999'></td> </tr> <tr> <td width="20%">Monthly Fee:</td> <td width="80%"><input onchange="findTotal()" type="number" class="input_box fee" name="monthly_fee" value="" min='0' max='999999'></td> </tr> <tr> <td width="20%">Remaining Balance:</td> <td width="80%"><input onchange="findTotal()" type="number" class="input_box fee" name="remaining_balance" value="" min='0' max='999999'></td> </tr> <tr> <td class="school_trow2" width="20%">Total Fee:</td> <td class="school_trow2" style="padding: 3px 0;" width="80%"><input type="text" class="input_box" style="background: #8CDFFF; border: 1px solid #006991; color: #000;" name="total_fee" id="total_fee" size="5" value="" disabled></td> </tr>
Never use the same id
for more than one element. This defeats the whole purpose. :)
Change the class
name on the total input field to something other than input_box
. That way you can select all other <input>
s by using document.querySelectorAll('.input_box')
. Than traverse them as you did with arr
and sum the values, etc.
function findTotal()
{
var arr = document.querySelectorAll('.input_box');
var tot=0;
for(var i=0;i<arr.length;i++)
{
if(parseInt(arr[i].value))
{
tot += parseInt(arr[i].value);
}
}
document.getElementById(\'total_fee\').value = tot;
}
Do what Philip and Ahsan Khan said about the HTML and using classes instead of ids for that.
Then use map
to parse each value into a integer (or use parseFloat
if you want float). Finally, use reduce
to sum everything.
const findTotal = () => {
const fees = [...document.querySelectorAll('.fee')].map(x => parseInt(x.value));
const total = fees.reduce((a, b) => a + b);
document.getElementById('total_fee').value = total;
}
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