I need to setup a function in javascript to remove the first character of a string but only if it is a comma ,
. I've found the substr
function but this will remove anything regardless of what it is.
My current code is
text.value = newvalue.substr(1);
text.value = newvalue.replace(/^,/, '');
Edit: Tested and true. This is just one way to do it, though.
s = (s.length && s[0] == ',') ? s.slice(1) : s;
或者使用正则表达式:
s = s.replace(/^,/, '');
var result = (myString[0] == ',') ? myString.substr(1) : myString;
thanks for the tips, got a working code here for myself. it will copy every list item and remove the 1st coma.
var list_with_coma = ", " + list_item;
var unwantedCharacter = ",";
$('#id_of_input').val(function(){
if (this.value.charAt(0) == unwantedCharacter){
this.value = this.value.substr(1);}
return this.value + list_with_coma;
});
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