listbox select count not work dont work
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sadpcd
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Published on 2012-06-19T02:38:16Z
Indexed on
2012/06/19
3:16 UTC
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JavaScript
|html
I recently trying to make a form with multiple select box. When someone select the options the number of selected options will be display on another text. I'm a beginner in JavaScript.
The function is called, but it doesn't count the number of the selected options.
<select name="element_17_1[ ]"
size="7" multiple="multiple"
class="element select medium"
id="element_17_1[ ]"
onfocus="selectCount(this.form);"
onClick="selectCount(this.form);"
>
<option value="Opt1">Opt1</option>
<option value="Opt2">Opt2</option>
<option value="Opt3">Opt3</option>
<option value="Opt4">Opt4</option>
<option value="Opt5">Opt5</option>
<option value="Opt6">Opt6</option>
<option value="Opt7">Opt7</option>
</select>
and this is the function I tried in the <head>
function selectCount(f) {
var selObj = myForm.elements['element_17_1[]'];
var totalChecked = 0;
for (i = 0; i < selObj.options.length; i++) {
if (selObj.options[i].selected) {
totalChecked++;
}
}
f.element_9.value = totalChecked;
}
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