问题
I\'m looking for an example of how to capitalize the first letter of a string being entered into a text field. Normally, this is done on the entire field with a function, regex, OnBlur, OnChange, etc. I want to capitalize the first letter while the user is still typing.
For instance, if I\'m typing the word \"cat\", the user should press \'c\', and then by the time he presses \'a\', the C should be capitalized in the field.
I think what I\'m going for might be possible with keyup or keypress but I\'m not sure where to start.
Anyone have an example for me?
回答1:
Just use CSS.
.myclass
{
text-transform:capitalize;
}
回答2:
This will simply transform you first letter of text:
yourtext.substr(0,1).toUpperCase()+yourtext.substr(1);
回答3:
I answered this somewhere else . However, here are two function you might want to call on keyup event.
To capitalize first word
function ucfirst(str,force){
str=force ? str.toLowerCase() : str;
return str.replace(/(\b)([a-zA-Z])/,
function(firstLetter){
return firstLetter.toUpperCase();
});
}
And to capitalize all words
function ucwords(str,force){
str=force ? str.toLowerCase() : str;
return str.replace(/(\b)([a-zA-Z])/g,
function(firstLetter){
return firstLetter.toUpperCase();
});
}
As @Darrell Suggested
$('input[type="text"]').keyup(function(evt){
// force: true to lower case all letter except first
var cp_value= ucfirst($(this).val(),true) ;
// to capitalize all words
//var cp_value= ucwords($(this).val(),true) ;
$(this).val(cp_value );
});
Hope this is helpful
Cheers :)
回答4:
$('input[type="text"]').keyup(function(evt){
var txt = $(this).val();
// Regex taken from php.js (http://phpjs.org/functions/ucwords:569)
$(this).val(txt.replace(/^(.)|\s(.)/g, function($1){ return $1.toUpperCase( ); }));
});
回答5:
CSS solution with "text-transform: capitalize;" is no good if you want to use the contents of the input in backend. You will still receive data as-is. JavaScript solves this issue.
JQuery plugin combined from some of the techniques mentioned earlier, plus it capitalizes words after hyphens, i.e.: "Tro Lo-Lo":
Add to your script:
jQuery.fn.capitalize = function() {
$(this[0]).keyup(function(event) {
var box = event.target;
var txt = $(this).val();
var stringStart = box.selectionStart;
var stringEnd = box.selectionEnd;
$(this).val(txt.replace(/^(.)|(\s|\-)(.)/g, function($word) {
return $word.toUpperCase();
}));
box.setSelectionRange(stringStart , stringEnd);
});
return this;
}
Then just attach capitalize() to any selector:
$('#myform input').capitalize();
回答6:
I used the code of @Spajus and wrote a more extended jQuery plugin.
I wrote these four jQuery functions:
upperFirstAll()to capitalize ALL words in an inputfieldupperFirst()to capitalize only the FIRST wordupperCase()to convert the hole text to upper caselowerCase()to convert the hole text to lower case
You can use and chain them like any other jQuery function:$('#firstname').upperFirstAll()
My complete jQuery plugin:
(function ($) {
$.fn.extend({
// With every keystroke capitalize first letter of ALL words in the text
upperFirstAll: function() {
$(this).keyup(function(event) {
var box = event.target;
var txt = $(this).val();
var start = box.selectionStart;
var end = box.selectionEnd;
$(this).val(txt.toLowerCase().replace(/^(.)|(\s|\-)(.)/g,
function(c) {
return c.toUpperCase();
}));
box.setSelectionRange(start, end);
});
return this;
},
// With every keystroke capitalize first letter of the FIRST word in the text
upperFirst: function() {
$(this).keyup(function(event) {
var box = event.target;
var txt = $(this).val();
var start = box.selectionStart;
var end = box.selectionEnd;
$(this).val(txt.toLowerCase().replace(/^(.)/g,
function(c) {
return c.toUpperCase();
}));
box.setSelectionRange(start, end);
});
return this;
},
// Converts with every keystroke the hole text to lowercase
lowerCase: function() {
$(this).keyup(function(event) {
var box = event.target;
var txt = $(this).val();
var start = box.selectionStart;
var end = box.selectionEnd;
$(this).val(txt.toLowerCase());
box.setSelectionRange(start, end);
});
return this;
},
// Converts with every keystroke the hole text to uppercase
upperCase: function() {
$(this).keyup(function(event) {
var box = event.target;
var txt = $(this).val();
var start = box.selectionStart;
var end = box.selectionEnd;
$(this).val(txt.toUpperCase());
box.setSelectionRange(start, end);
});
return this;
}
});
}(jQuery));
Groetjes :)
回答7:
My personal favorite when using jQuery is short and sweet:
function capitalize(word) {
return $.camelCase("-" + word);
}
There's a jQuery plugin that does this too. I'll call it... jCap.js
$.fn.extend($, {
capitalize: function() {
return $.camelCase("-"+arguments[0]);
}
});
回答8:
$("#test").keyup(
function () {
this.value = this.value.substr(0, 1).toUpperCase() + this.value.substr(1).toLowerCase();
}
);
回答9:
Slight update to the code above to force the string to lower before Capitaliing the first letter.
(Both use Jquery syntax)
function CapitaliseFirstLetter(elemId) {
var txt = $("#" + elemId).val().toLowerCase();
$("#" + elemId).val(txt.replace(/^(.)|\s(.)/g, function($1) {
return $1.toUpperCase(); }));
}
In addition a function to Capitalise the WHOLE string:
function CapitaliseAllText(elemId) {
var txt = $("#" + elemId).val();
$("#" + elemId).val(txt.toUpperCase());
}
Syntax to use on a textbox's click event:
onClick="CapitaliseFirstLetter('myTextboxId'); return false"
回答10:
My appologies. The syntax was off due to me being in a hurry and sloppy. Here you go...
$('#tester').live("keyup", function (evt)
{
var txt = $(this).val();
txt = txt.substring(0, 1).toUpperCase() + txt.substring(1);
$(this).val(txt);
});
Simple but works. You would def want to make this more general and plug and playable. This is just to offer another idea, with less code. My philosophy with coding, is making it as general as possible, and with as less code as possible.
Hope this helps. Happy coding! :)
回答11:
It's very cool you can capitalize Only the first letter of an input field With this one.. If any one know how to capitalize Like CSS text-transform:capitalize, Please Reply .. Here You go..
$('input-field').keyup(function(event) {
$(this).val(($(this).val().substr(0,1).toUpperCase())+($(this).val().substr(1)));
});
回答12:
A turkish one. If someone is still interested.
$('input[type="text"]').keyup(function() {
$(this).val($(this).val().replace(/^([a-zA-Z\s\ö\ç\ş\ı\i\ğ\ü\Ö\Ç\Ş\İ\Ğ\Ü])|\s+([a-zA-Z\s\ö\ç\ş\ı\i\ğ\ü\Ö\Ç\Ş\İ\Ğ\Ü])/g, function ($1) {
if ($1 == "i")
return "İ";
else if ($1 == " i")
return " İ";
return $1.toUpperCase();
}));
});
回答13:
this will help you in - convert first letter of each word to uppercase
<script>
/* convert First Letter UpperCase */
$('#txtField').on('keyup', function (e) {
var txt = $(this).val();
$(this).val(txt.replace(/^(.)|\s(.)/g, function ($1) {
return $1.toUpperCase( );
}));
});
</script>
Example : this is a title case sentence -> This Is A Title Case Sentence
回答14:
With Javascript you can use:
yourtext.substr(0,1).toUpperCase()+yourtext.substr(1);
If by chance you're generating your web page with PHP you can also use:
<?=ucfirst($your_text)?>
回答15:
A solution that accept exceptions(passed by parameters):
Copy the below code and use it like this: $('myselector').maskOwnName(['of', 'on', 'a', 'as', 'at', 'for', 'in', 'to']);
(function($) {
$.fn.teste = function(not_capitalize) {
not_capitalize = !(not_capitalize instanceof Array)? []: not_capitalize;
$(this).keypress(function(e){
if(e.altKey || e.ctrlKey)
return;
var new_char = String.fromCharCode(e.which).toLowerCase();
if(/[a-zà-ú\.\, ]/.test(new_char) || e.keyCode == 8){
var start = this.selectionStart,
end = this.selectionEnd;
if(e.keyCode == 8){
if(start == end)
start--;
new_char = '';
}
var new_value = [this.value.slice(0, start), new_char, this.value.slice(end)].join('');
var maxlength = this.getAttribute('maxlength');
var words = new_value.split(' ');
start += new_char.length;
end = start;
if(maxlength === null || new_value.length <= maxlength)
e.preventDefault();
else
return;
for (var i = 0; i < words.length; i++){
words[i] = words[i].toLowerCase();
if(not_capitalize.indexOf(words[i]) == -1)
words[i] = PHP.ucfirst(words[i]);
}
this.value = words.join(' ');
this.setSelectionRange(start, end);
}
});
}
$.fn.maskLowerName = function(pos) {
$(this).css('text-transform', 'lowercase').bind('blur change', function(){
this.value = this.value.toLowerCase();
});
}
$.fn.maskUpperName = function(pos) {
$(this).css('text-transform', 'uppercase').bind('blur change', function(){
this.value = this.value.toUpperCase();
});
}
})(jQuery);
回答16:
.first-character{
font-weight:bold;
color:#F00;
text-transform:capitalize;
}
.capital-text{
text-transform:uppercase;
}
回答17:
Jquery or Javascipt doesn't provide a built-in method to achieve this.
CSS test transform (text-transform:capitalize;) doesn't really capitalize the string's data but shows a capitalized rendering on the screen.
If you are looking for a more legit way of achieving this in the data level using plain vanillaJS, use this solution =>
var capitalizeString = function (word) {
word = word.toLowerCase();
if (word.indexOf(" ") != -1) { // passed param contains 1 + words
word = word.replace(/\s/g, "--");
var result = $.camelCase("-" + word);
return result.replace(/-/g, " ");
} else {
return $.camelCase("-" + word);
}
}
回答18:
I use both CSS and jQuery solutions when achieving this. This will change both how it appears in the browser and the data value. A simple solution, that just works.
CSS
#field {
text-transform: capitalize;
}
jQuery
$('#field').keyup(function() {
var caps = jQuery('#field').val();
caps = caps.charAt(0).toUpperCase() + caps.slice(1);
jQuery('#field').val(caps);
});
回答19:
My attempt.
Only acts if all text is lowercase or all uppercase, uses Locale case conversion. Attempts to respect intentional case difference or a ' or " in names. Happens on Blur as to not cause annoyances on phones. Although left in selection start/end so if changed to keyup maybe useful still. Should work on phones but have not tried.
$.fn.capitalize = function() {
$(this).blur(function(event) {
var box = event.target;
var txt = $(this).val();
var lc = txt.toLocaleLowerCase();
var startingWithLowerCaseLetterRegex = new RegExp("\b([a-z])", "g");
if (!/([-'"])/.test(txt) && txt === lc || txt === txt.toLocaleUpperCase()) {
var stringStart = box.selectionStart;
var stringEnd = box.selectionEnd;
$(this).val(lc.replace(startingWithLowerCaseLetterRegex, function(c) { return c.toLocaleUpperCase() }).trim());
box.setSelectionRange(stringStart, stringEnd);
}
});
return this;
}
// Usage:
$('input[type=text].capitalize').capitalize();
回答20:
Slight update to cumul's solution.
The function upperFirstAll doesn't work properly if there is more than one space between words. Replace the regular expression for this one to solve it:
$(this).val(txt.toLowerCase().replace(/^(.)|(\s|\-)+(.)/g,
来源：https://stackoverflow.com/questions/2017456/with-jquery-how-do-i-capitalize-the-first-letter-of-a-text-field-while-the-user