check all values match using prototype
Using prototype, is there a simple method of checking that a group of v开发者_C百科alues match, for example - can this code be refined to a single line or something otherwise more elegant?
var val = null;
var fail = false;
$('form').select('.class').each(function(e){
if(!val){
val = $F(e);
}else{
if(val != $F(e)) fail = true;
}
});
Oh, this oneliner should do it:
$(form).select('.'+className).invoke('getValue').uniq().size()===1; // true means all values are the same
- Make an array out of the values of the (input/etc) elements with the class name you are after (run
invokeon a set of selected elements) - Make the array contain unique values only (call
uniqon the array) - See if its length is 1
Links to Prototype docs: Element.select, Enumerable#invoke, Form.Element.getValue, Array#uniq
Example:
<body>
<form action="#" id="myform">
<input type="text" name="foo1" class="foo" />
<input type="text" name="foo2" class="foo" />
<input type="text" name="foo3" class="foo" />
<input type="text" name="foo4" class="foo" />
<input type="text" name="foo5" class="foo" />
<input type="submit" />
</form>
<script type="text/javascript">
// Returns true if all values of elements with a certain classname in the form has the same value
function bar(form, className) {
return $(form).select('.'+className).invoke('getValue').uniq().size()===1;
}
// Usage: bar('myform', 'foo');
</script>
</body>
加载中,请稍侯......
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