How to place cursor at end of text in textarea when tabbed into [duplicate]

问题

Possible Duplicate:
Javascript: Move caret to last character

I have a standard textarea with some text in it. I'm looking for a way to have the cursor automatically be placed at the end of the existing text so a user can simply start typing to add more text. This should happen whenever the textarea becomes active such as when a user tabs into it. Any ideas?

回答1:

I've answered this before: Javascript: Move caret to last character

jsFiddle: http://jsfiddle.net/ghAB9/6/

Code:

<textarea id="test">Some text</textarea>

function moveCaretToEnd(el) {
    if (typeof el.selectionStart == "number") {
        el.selectionStart = el.selectionEnd = el.value.length;
    } else if (typeof el.createTextRange != "undefined") {
        el.focus();
        var range = el.createTextRange();
        range.collapse(false);
        range.select();
    }
}

var textarea = document.getElementById("test");

textarea.onfocus = function() {
    moveCaretToEnd(textarea);

    // Work around Chrome's little problem
    window.setTimeout(function() {
        moveCaretToEnd(textarea);
    }, 1);
};

回答2:

You need to listen to the focus event in the text area for example :

<textarea onfocus="setCursorAtTheEnd(this,event)"/>

And then in your javascript code:

function setCursorAtTheEnd(aTextArea,aEvent) {
    var end=aTextArea.value.length;
    if (aTextArea.setSelectionRange) {
        setTimeout(aTextArea.setSelectionRange,0,[end,end]);  
    } else { // IE style
        var aRange = aTextArea.createTextRange();
        aRange.collapse(true);
        aRange.moveEnd('character', end);
        aRange.moveStart('character', end);
        aRange.select();    
    }
    aEvent.preventDefault();
    return false;
}

来源：https://stackoverflow.com/questions/6003300/how-to-place-cursor-at-end-of-text-in-textarea-when-tabbed-into

标签

javascript

textarea