加载时的焦点输入框

小开

最佳答案

There are two parts to your question.

1) How to focus an input on page load?

You can just add the autofocus attribute to the input.

<input id="myinputbox" type="text" autofocus>

However, this might not be supported in all browsers, so we can use javascript.

window.onload = function() {
var input = document.getElementById("myinputbox").focus();
}

2) How to place cursor at the end of the input text?

Here's a non-jQuery solution with some borrowed code from another SO answer.

function placeCursorAtEnd() {
if (this.setSelectionRange) {
// Double the length because Opera is inconsistent about
// whether a carriage return is one character or two.
var len = this.value.length * 2;
this.setSelectionRange(len, len);
} else {
// This might work for browsers without setSelectionRange support.
this.value = this.value;
}


if (this.nodeName === "TEXTAREA") {
// This will scroll a textarea to the bottom if needed
this.scrollTop = 999999;
}
};


window.onload = function() {
var input = document.getElementById("myinputbox");


if (obj.addEventListener) {
obj.addEventListener("focus", placeCursorAtEnd, false);
} else if (obj.attachEvent) {
obj.attachEvent('onfocus', placeCursorAtEnd);
}


input.focus();
}

Here's an example of how I would accomplish this with jQuery.

<input type="text" autofocus>


<script>
$(function() {
$("[autofocus]").on("focus", function() {
if (this.setSelectionRange) {
var len = this.value.length * 2;
this.setSelectionRange(len, len);
} else {
this.value = this.value;
}
this.scrollTop = 999999;
}).focus();
});
</script>

小开

function focusOnMyInputBox(){
document.getElementById("myinputbox").focus();
}


<body onLoad="focusOnMyInputBox();">


<input type="text"  size="25" id="myinputbox" class="input-text" name="input2" onfocus="this.value = this.value;" value = "initial text">

小开

A portable way of doing this is using a custom function (to handle browser differences) like this one.

Then setup a handler for the onload at the end of your <body> tag, as jessegavin wrote:

window.onload = function() {
document.getElementById("myinputbox").focus();
}

小开

Just a heads up - you can now do this with HTML5 without JavaScript for browsers that support it:

<input type="text" autofocus>

You probably want to start with this and build onto it with JavaScript to provide a fallback for older browsers.

小开

$(document).ready(function() {
$('#id').focus();
});

小开

This is what works fine for me:

<form name="f" action="/search">
<input name="q" onfocus="fff=1" />
</form>

fff will be a global variable which name is absolutely irrelevant and which aim will be to stop the generic onload event to force focus in that input.

<body onload="if(!this.fff)document.f.q.focus();">
<!-- ... the rest of the page ... -->
</body>

From: http://webreflection.blogspot.com.br/2009/06/inputfocus-something-really-annoying.html

小开

If you can't add to the BODY tag for some reason, you can add this AFTER the Form:

<SCRIPT type="text/javascript">
document.yourFormName.yourFieldName.focus();
</SCRIPT>

小开

Working fine...

window.onload = function() {
var input = document.getElementById("myinputbox").focus();
}

小开

Try:

Javascript Pure:

[elem][n].style.visibility='visible';
[elem][n].focus();

Jquery:

[elem].filter(':visible').focus();

小开

very simple one line solution:

<body onLoad="document.getElementById('myinputbox').focus();">

小开

Add this to the top of your js

var input = $('#myinputbox');


input.focus();

Or to html

<script>
var input = $('#myinputbox');


input.focus();
</script>