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BOOK: Beginning HTML, XHTML, CSS, and JavaScript
This is the forum to discuss the Wrox book Beginning HTML, XHTML, CSS, and JavaScript by Jon Duckett; ISBN: 978-0-470-54070-1
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Old October 4th, 2011, 01:56 PM
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Default OnPasteClick doesn't fire when using right click menu?

My OnPaste event is firing when I paste using the <ctl>+<v> or <shift>+<ins>, but not when using the right click mouse menu. What must I do to get it to recognize when users paste text using the right click mouse menu paste option?
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Old October 7th, 2011, 11:02 AM
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Greetings,

The following code works for any means of trying to paste a value into a textbox etc that has the onpaste attribute set:
Code:
// Register onpaste on inputs and textareas in browsers that don't
// natively support it.
(function () {
    var onload = window.onload;

    window.onload = function () {
        if (typeof onload == "function") {
            onload.apply(this, arguments);
        }

        var fields = [];
        var inputs = document.getElementsByTagName("input");
        var textareas = document.getElementsByTagName("textarea");

        for (var i = 0; i < inputs.length; i++) {
            fields.push(inputs[i]);
        }

        for (var i = 0; i < textareas.length; i++) {
            fields.push(textareas[i]);
        }

        for (var i = 0; i < fields.length; i++) {
            var field = fields[i];

            if (typeof field.onpaste != "function" && !!field.getAttribute("onpaste")) {
                field.onpaste = eval("(function () { " + field.getAttribute("onpaste") + " })");
            }

            if (typeof field.onpaste == "function") {
                var oninput = field.oninput;

                field.oninput = function () {
                    if (typeof oninput == "function") {
                        oninput.apply(this, arguments);
                    }

                    if (typeof this.previousValue == "undefined") {
                        this.previousValue = this.value;
                    }

                    var pasted = (Math.abs(this.previousValue.length - this.value.length) > 1 && this.value != "");

                    if (pasted && !this.onpaste.apply(this, arguments)) {
                        this.value = this.previousValue;
                    }

                    this.previousValue = this.value;
                };

                if (field.addEventListener) {
                    field.addEventListener("input", field.oninput, false);
                } else if (field.attachEvent) {
                    field.attachEvent("oninput", field.oninput);
                }
            }
        }
    }
})();
To use it:
Code:
<input type="text" name="id" value="" onpaste="return false;" />
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Old October 7th, 2011, 11:10 AM
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Thanks, Useless!
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