Javascript disabling contents selection

onmousedown and draggin the开发者_如何学运维 contents of Container will be selected. How can I disable this selection behaviour.

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I've written Prototype.JS methods for this, you can use them.

Element.addMethods({
    /**
     * Makes element unselectable. Disables cursor select
     * @param {Object} target
     */
    setUnselectable: function(target){
        if (typeof target.onselectstart != "undefined") {target.onselectstart = function(){return false;};}
        else if (typeof target.style.MozUserSelect != "undefined") { target.style.MozUserSelect = "none";}
        else {target.onmousedown = function(){ return false;}; }
        return target;
    },
    /**
     * Reverts unselectable effect, Enables cursor select
     * @param {Object} target
     */
    setSelectable: function(target){
        if (typeof target.onselectstart != "undefined") { target.onselectstart = document.createElement("div").onselectstart; }
        else if (typeof target.style.MozUserSelect != "undefined") { target.style.MozUserSelect = document.createElement("div").style.MozUserSelect; } 
        else { target.onmousedown = ""; }
        return target;
    }
});

To make an element unselectable

$('element_id').setUnselectable();

To revert it back

$('element_id').setSelectable();

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To cover all bases, set all these properties in your css:

user-select: none
-webkit-user-select: none
-khtml-user-select: none
-moz-user-select: none