File upload control for cross-browser display based on jquery

File upload control for cross-browser display based on jquery_jquery

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Release： 2016-05-16 18:00:20

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I wrote a short article before, briefly introducing how to define the style of input type="file". For general forms, there are fewer upload controls. This approach is really good. It not only reduces the code, but also beautifies the style. Original text: "Define the style of input type="file""

In fact, the general idea of defining a style for the file control is the same.

Today I saw Fanhua from the blog garden writing two articles to study the file control
《jquery.fileEveryWhere.js--a cross-browser file display plug-in》
"What is the size of input type="file" in firefox"

I can’t hold myself back here. The results are prosperous. The following content is quoted from the above two articles:

Daniel ppk has said that among multiple form controls, the style of the upload file control is the most difficult to control. See the article Styling an input type="file". This plug-in is mostly based on this article.

Let’s first take a look at the different expressions of input type="file" in the three browsers of chrome, ie, and firefox.

File upload control for cross-browser display based on jquery_jquery

chrome is like a button label combination, which looks the biggest difference.

ff and ie are a combination of text buttons. In terms of appearance, firefox is more standard. In fact, firefox has two potential problems:
1. Firefox’s input width of type="file" Definition is currently not supported (but FF supports the size attribute. You can set a value for size to control the size of the upload box. As for how big this size is, see the article Fanhua-What is the size of input type="file" under firefox? ).
2. When submitting the file form, Firefox only submits the file name but not the path, while IE submits the path file name. Chrome can also submit the path file name, but only displays the file name. When submitting the file form in Firefox, only the file name is submitted but not the path (unfortunately, there is no solution for the time being)

To make the file display uniformly in various browsers, pure style can no longer be controlled, and only js can be used Scripted. There are 3 basic steps:
1. Use text boxes and buttons to simulate an input type="file".
2. Make input="file" transparent, and use positioning to completely cover the text box and button.
3. When input type="file" is onchanged, use js to set the value of the text box to the value of input type="file".

After understanding the steps, the entire plug-in is easy to write. The code is as follows:

Copy the code The code is as follows:

/*
* file everywhere - browser universal file upload
* copyright->flowerszhong
* flowerszhong@gmail.com
* http://www .cnblogs.com/flowerszhong/
*/
(function($) {
$.fn.fileEveryWhere = function(options) {
var defaults = {
WrapWidth: 300,
WrapHeight: 30,
ButtonWidth: 60,
ButtonHeight: 28,
ButtonText: "Browse",
TextHeight: 28,
TextWidth: 240
};
var options = $.extend(defaults, options);
var browser_ver = $.browser.version.substr(0, 1);
var displayMode = ($.browser.msie && browser_ver <= "7 ") ? "inline" : "inline-block";
return this.each(function() {
//Create a containment and set it to relative positioning
var wrapper = $("

")
.css({
"width": options.WrapWidth "px",
"height": options.WrapHeight "px",
"display": displayMode,
"zoom": "1",
"position": "relative",
"overflow": "hidden",
"z-index":"1"
});
//Create a text input box to store the name of the uploaded file
var text = $('')
. css({
"width": options.TextWidth "px",
"heigth": options.TextHeight "px"
});
//Create a browse button
var button = $('')
.val(options.ButtonText);
$(this).wrap(wrapper).parent().append (text, button);
$(this).css({
"position": "absolute",
"top": "0",
"left": "0",
"z-index": "2",
"height": options.WrapHeight "px",
"width": options.WrapWidth "px",
"cursor": "pointer ",
"opacity": "0.0",
"outline":"0",
"filter": "alpha(opacity:0)"
});
if ( $.browser.mozilla) { $(this).attr("size", 1 (options.WrapWidth - 85) / 6.5) }
$(this).bind("change", function() {
text.val($(this).val());
});
});
};
})(jQuery);

Using is very simple:

$("input:file").fileEveryWhere({parameter});

firefox input of type="file" The width definition is currently not supported, but FF supports the size attribute. You can set a value for size to control the size of the upload box.
But how to set this size value, how wide is size="10", and what is the default value? You cannot set it based on feeling. Check it out with a script:

Copy the code The code is as follows:

Get this result under Firefox:
File upload control for cross-browser display based on jquery_jquery

Found it Certain rules, the default is 208 pixels, when size="1" it is 85 pixels, the width of each size differs by 6.5 pixels, so we can dynamically set the size value, such as:

Copy code The code is as follows:

if ($.browser.mozilla) { $(this).attr("size", 1 (options.WrapWidth - 85) / 6.5)