jQuery或Javascript计算字符，如果不等于20，则在两个字段中

Question

我一直在寻找一个脚本来计算2个文本区域中的字符，如果它不等于20个字符，则会在20个字符后添加“空格”。

Answer 1

var combined = $('#first').val() + $('#second').val();

while (combined.length < 20) 
{
    combined += ' ';
}

alert(combined);

JSFiddle DEMO

Answer 2

You can loop through the text in the textarea and keep padding it until it is 20 in length.

HTML :

<textarea></textarea>
<textarea></textarea>
<a id="pad" href="#">Pad to 20</a>

jQuery :

$("#pad").click(function(){
$("textarea").each(function(index, element){
    while(this.value.length < 20){
        this.value = this.value + " ";     
    }
});

});​

Try it out!

Answer 3

This would take an input string and create a 20-char min string from it.

<script type="text/javascript">
    function pad_right(s){
        if(s.length < 20){
            for (var i = 0; i < 20 - s.length; i++) {
                s += " ";
            }
        }
        return s;
    }
</script>

Answer 4

function padString (text, length) {
    while (text.length < length)
        text = text + ' ';
    return text;
}