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/ 11 Years ago, mon, august 12, 2013, 12:00:00
Okay, so this may be a stupid question, but I'm attempting to write a simple JavaScript app-thing (please excuse my terminology, I'm new to this) which includes a form, except I'm doing it using only HTML and JS (and CSS), so I'm accessing the values in the form by using document.getElementById.
The thing is the Javascript function is supposed to display something, based on the form values (it's basically a GPA calculator), but the things to display simply flash on the screen, and then disappear when I run the HTML file as is, and don't show up at all when I run it through my actual domain. I feel like the reason for this is that after you submit the form, a bunch of URL parameters get tacked on, thus refreshing the HTML, and deleting the newly added innerHTML.
Here's the code for my form:
<form id=calculator name=calculator>
<table>
<thead>
<tr>
<td>Class Number</td>
<td>Grade</td>
<td>AP/Non-AP</td>
<td>GPA</td>
</tr>
</thead>
<tbody>
<tr>
<td class=classnumber>Class 1</td>
<td>
<select id=class1GPA name=class1GPA>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class1AP name=class1AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class1disp>
</td>
</tr>
<tr>
<td class=classnumber>Class 2</td>
<td>
<select id=class2GPA name=class2GPA>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class2AP name=class2AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class2disp>
</td>
</tr>
<tr>
<td class=classnumber>Class 3</td>
<td>
<select id=class3GPA name=class3GPA>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class3AP name=class3AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class3disp>
</td>
</tr>
<tr>
<td class=classnumber>Class 4</td>
<td>
<select id=class4GPA name=class4GPA>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class4AP name=class4AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class4disp>
</td>
</tr>
<tr>
<td class=classnumber>Class 5</td>
<td>
<select id=class5GPA name=class5GPA>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class5AP name=class5AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class5disp>
</td>
</tr>
<tr>
<td class=classnumber>Class 6</td>
<td>
<select id=class6GPA name=class6GPA>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class6AP name=class6AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class6disp>
</td>
</tr>
<tr>
<td class=classnumber>Class 7</td>
<td>
<select id=class7GPA name=class7GPA>
<option value=none>N/A</option>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class7AP name=class7AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class7disp>
</td>
</tr>
<tr>
<td class=classnumber>Class 8</td>
<td>
<select id=class8GPA name=class8GPA>
<option value=none>N/A</option>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id=class8AP name=class8AP>
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id=class8disp>
</td>
</tr>
</br>
</tbody>
</table>
<input onClick=showGPA() id=submit type=submit value=Calculate!/>
</form>
And the Javascript that is supposed to process it (it doesn't actually display an average yet, but that's less important than figuring out why it just flashes/doesn't display):
function showGPA() {
var grades = {};
grades.classesNumber = 6
if (document.getElementById('class1AP').value === True) {
grades.class1 = parseFloat(document.getElementById('class1GPA').value) + 0.5;
} else {
grades.class1 = parseFloat(document.getElementById('class1GPA').value);
}
document.getElementById('class1disp').innerHTML = grades.class1.toFixed(1);
if (document.getElementById('class2AP').value === True) {
grades.class2 = parseFloat(document.getElementById('class2GPA').value) + 0.5;
} else {
grades.class2 = parseFloat(document.getElementById('class2GPA').value);
}
document.getElementById('class2disp').innerHTML = grades.class2.toFixed(1);
if (document.getElementById('class3AP').value === True) {
grades.class3 = parseFloat(document.getElementById('class3GPA').value) + 0.5;
} else {
grades.class3 = parseFloat(document.getElementById('class3GPA').value);
}
document.getElementById('class3disp').innerHTML = grades.class3.toFixed(1);
if (document.getElementById('class4AP').value === True) {
grades.class4 = parseFloat(document.getElementById('class4GPA').value) + 0.5;
} else {
grades.class4 = parseFloat(document.getElementById('class4GPA').value);
}
document.getElementById('class4disp').innerHTML = grades.class4.toFixed(1);
if (document.getElementById('class5AP').value === True) {
grades.class5 = parseFloat(document.getElementById('class5GPA').value) + 0.5;
} else {
grades.class5 = parseFloat(document.getElementById('class5GPA').value);
}
document.getElementById('class5disp').innerHTML = grades.class5.toFixed(1);
if (document.getElementById('class6AP').value === True) {
grades.class6 = parseFloat(document.getElementById('class6GPA').value) + 0.5;
} else {
grades.class6 = parseFloat(document.getElementById('class6GPA').value);
}
document.getElementById('class6disp').innerHTML = grades.class6.toFixed(1);
if (document.getElementById('class7GPA').value !== none) {
if (document.getElementById('class7AP').value === True) {
grades.class7 = parseFloat(document.getElementById('class7GPA').value) + 0.5;
} else {
grades.class7 = parseFloat(document.getElementById('class7GPA').value);
}
document.getElementById('class7disp').innerHTML = grades.class7.toFixed(1);
grades.classesNumber++;
} else {
grades.class7 = 0;
}
if (document.getElementById('class8GPA').value !== none) {
if (document.getElementById('class8AP').value === True) {
grades.class8 = parseFloat(document.getElementById('class8GPA').value) + 0.5;
} else {
grades.class8 = parseFloat(document.getElementById('class8GPA').value);
}
document.getElementById('class8disp').innerHTML = grades.class8.toFixed(1);
grades.classesNumber++;
} else {
grades.class8 = 0;
}
}
How is it possible for me to stop 16 different URL parameters from being added on when the form submits?
Now my guess as to why it doesn't work may be completely wrong, as I said, I'm new to this. (While trying to make this work, I noticed that one of the problems was that I spelt .innerHTML as .innnerHTML)
But if someone could help me make this work, preferably without learning PHP or something, that would be great. Thanks!
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