What is the recommended method for blanking inputs in jQuery

I have a small subset of fields that need blanked on a page (so I can't just run something using 开发者_如何学JAVA:input).

At the moment the code is something like this..

$('#txt1').val('');
$('#txt2').val('');
$('#txt3').val('');

Is it more efficient to chain them or is there some other method entirely I could use?

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You can do:

$('#txt1, #txt2, #txt3').val('');

Or:

$('#txt1, #txt2, #txt3').empty();

As can be seen, you can combine multiple selectors by separating them with a comma.

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Alternatively you can apply a class to fields you want to clear the text of and use the class in the selector like this:

$('.empty').empty();

where your fiels should look like:

<input class='empty' name="name1" />
<input class='empty' name="name2" />
<input class='empty' name="name3" />

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You can select them all at once:

$('#txt1, #txt2, #txt3').val('');

This won't make a significant difference, but probably will make a small improvement. The biggest improvement is in making your code less repetitive and therefore easier to follow.

Edit: In fact, this makes the selection significantly slower. This is because selections by a single ID are very fast. document.getElementById is quicker than document.querySelectorAll. Stick with what you have.

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You could try adding a class to each...

HTML

<input class='blankable' type=... />

JavaScript

$('.blankable').val('');

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Well i would do it with one line and null, but i guess its however you prefer it:

<input value="foo" id="txt1" />
<input value="foo" id="txt2" />
<input value="foo" id="txt3" />

<script type='text/javascript' src='http://code.jquery.com/jquery-latest.min.js'></script>
<script>
$(document).ready(function(){
    $('#txt1, #txt2, #txt3').val(null);
});
</script>

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Be aware that setting .val('') will not work for all types of :input elements.

I use the following function which may not be complete but covers all the scenarios my application currently encounters.

function clearForm($container) {
    $(':input', $container).each(function() {
        $(this).removeClass('input-validation-error');
        if (!$(this).attr('readonly')) {
            var type = this.type;
            if (type == 'text' || type == 'file')
                this.value = "";
            else if (this.tagName.toLowerCase() == 'select')
                this.selectedIndex = 0;
            // checkboxes need to have their checked state cleared
            // but should *not* have their 'value' changed
            else if (type == 'checkbox' || type == 'radio')
                this.checked = false;
        }
    });
}

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jQuery(':input').val(''); should select all your inputs and clear the value. I do not know however if <select> and <textarea> need special attention. Also, you might need to exclude invisible inputs if you have <input type="hidden">. In that case, consider:

jQuery('[type!="hidden"]:input').val('');

EDIT

Just read that I missed something. If you are selecting from a subset, select the subset first.

jQuery('#subset :input').val('');