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placeholder jquery - programmatic focus

开发者 https://www.devze.com 2023-03-25 17:38 出处:网络
using the below jquery placeholder plugin that creates labels and overlays the field with the label.

using the below jquery placeholder plugin that creates labels and overlays the field with the label.

My issue is that I have field validation and a function that places focus on the field that returns a validation error.

By setting the focus programatically, the label/placeholder persists. If I click into the field, it works as it should.

Any obvious workarounds?

/*****************************************************************************
jQuery Placeholder 1.1.1

Copyright (c) 2010 Michael J. Ryan (http://tracker1.info/)

Dual licensed under the MIT and GPL licenses:
    http://www.opensource.org/licenses/mit-license.php
    http://www.gnu.org/licenses/gpl.html

------------------------------------------------------------------------------

Sets up a watermark for inputted fields... this will create a LABEL.watermark
tag immediately following the input tag, the positioning will be set absolute,
and it will be positioned to match the input tag.

To activate on all tags with a 'data-watermark' attribute:

    $('input[placeholder],textarea[placeholder]').placeholder();


To style the tags as appropriate (you'll want to make sure the font matches):

    label.placeholder {
        cursor: text;               <--- display a cursor to match the text input

        padding: 4px 4px 4px 4px;   <--- this should match the border+padding
                                            for the input field(s)
        color: #999999;             <--- this will display as faded
    }

You'll also want to have the color set for browsers with native support
    input:placeholder, textarea:placeholder {
        color: #999999;
    }
    input::-webkit-input-placeholder, textarea::-webkit-input-placeholder {
        color: #999999;
    }

------------------------------------------------------------------------------

Thanks to...
    http://www.alistapart.com/articles/makingcompactformsmoreaccessible
    http://plugins.jquery.com/project/overlabel

    This works similar to the overlabel, but creates the actual label tag
    based on a data-watermark attribute on the input tag, instead of
    relying on the markup to provide it.

*****************************************************************************/
(function($){

    var ph = "PLACEHOLDER-INPUT";
    var phl = "PLACEHOLDER-LABEL";
    var boundEvents = false;
    var default_options = {
        labelClass: 'placeholder'
    };

    //check for native support for placeholder attribute, if so stub methods and return
    var input = document.createElement("input");
    if ('placeholder' in input) {
        $.fn.placeholder = $.fn.unplaceholder = function(){}; //empty function
        delete input; //cleanup IE memory
        return;
    };
    delete input;

    $.fn.placeholder = function(options) {
        bindEvents();

        var opts = $.extend(default_options, options)

        this.each(function(){
            var rnd=Math.random().toString(32).replace(/\./,'')
                ,input=$(this)
                ,label=$('<label style="position:absolute;display:none;top:0;left:0;"></label>');

            if (!input.attr('placeholder') || input.data(ph) === ph) return; //already watermarked

            //make sure the input tag has an ID assigned, if not, assign one.
            if (!input.attr('id')) input.attr('id') = 'input_' + rnd;

            label   .attr('id',input.attr('id') + "_placeholder")
                    .data(ph, '#' + input.attr('id'))   //reference to the input tag
                    .attr('for',input.attr('id'))
                    .addClass(opts.labelClass)
                    .addClass(opts.labelClass + '-for-' + this.tagName.toLowerCase()) //ex: watermark-for-textarea
                    .addClass(phl)
                    .text(input.attr('placeholder'));

            input
                .data(phl, '#' + label.attr('id'))  //set a reference to the label
                .data(ph,ph)        //set that the field is watermarked
                .addClass(ph)       //add the watermark class
                .after(label);      //add the label field to the page

            //setup overlay
            itemIn.call(this);
            itemOut.call(this);
        });
    };

    $.fn.unplaceholder = function(){
        this.each(function(){
            var input=$(this),
                label=$(input.data(phl));

            if (input.data(ph) !== ph) return;

            label.remove();
            input.removeData(ph).removeData(phl).removeClass(ph);
        });
    };


    function bindEvents() {
        if (boundEvents) return;

        //prepare live bindings if not already done.
        $('.' + ph)
            .live('click',itemIn)
            .live('focusin',itemIn)
            .live('focusout',itemOut);
        bound = true;

        boundEvents = true;
    };

    function itemIn() {
        var input = $(this)
            ,label = $(input.data(phl));

        label.css('display', 'none');
    };

    function itemOut() {
        var that = this;

        //use timeout to let other validators/formatters directly bound开发者_如何学运维 to blur/focusout work first
        setTimeout(function(){
            var input = $(that);
            $(input.data(phl))
                .css('top', input.position().top + 'px')
                .css('left', input.position().left + 'px')
                .css('display', !!input.val() ? 'none' : 'block');
        }, 200);
    };

}(jQuery));

and here's the generated code on a field:

<input name="Number" title="Enter Gift Card 1 Number" class="CO_PM_GiftCardNumField PLACEHOLDER-INPUT" id="frmGCD_1_Number" style="width: 144px;" onkeypress="return checkEnter(event,'frmGCD_1')" type="text" maxLength="19" placeholder="Enter gift card" />
<label class="placeholder placeholder-for-input PLACEHOLDER-LABEL" id="frmGCD_1_Number_placeholder" style="position: absolute; display: block; top: 18px; left: 14px;" for="frmGCD_1_Number" >


Try trigger() when you call the script that focuses the field:

$(element).trigger('focus');

If focus doesn't work, try another event like click or focusin.


ok - I fixed it.

Since I was setting the focus with another script, I needed to add focus (not focusin) into the plugin:

.live('click',itemIn)
.live('focusin',itemIn)
.live('focus',itemIn)
.live('focusout',itemOut);
bound = true;
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