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July 31, 2019 22:07
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Responds to window resize events. Max font size taken from initial font size (specify with CSS).
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(function($) { | |
function getTextWidth($element) { | |
var tester = $("<div/>").text($element.text()) | |
.css({ "position": "absolute", "float": "left", "white-space": "nowrap", "visibility": "hidden", "font": $element.css("font"), "text-transform": $element.css("text-transform"), "letter-spacing": $element.css("letter-spacing") }) | |
.appendTo($element.parent()), | |
width = tester.innerWidth(); | |
tester.remove(); | |
return width; | |
} | |
function AutoShrinker($element) { | |
this.$element = $element; | |
this.$parent = $element.parent(); | |
this.initialFontSize = parseFloat($element.css("fontSize")); | |
this.currentFontSize = this.initialFontSize; | |
this.leftMarginRatio = parseFloat($element.css("marginLeft")) / this.initialFontSize; | |
this.resize = function() { | |
var maxWidth = this.$parent.width(), | |
newSize = this.currentFontSize * (maxWidth / getTextWidth(this.$element)); | |
newSize = newSize > this.initialFontSize ? this.initialFontSize : newSize; | |
this.$element.css({ | |
"fontSize": newSize, | |
"marginLeft": newSize * this.leftMarginRatio | |
}); | |
this.currentFontSize = newSize; | |
}; | |
} | |
$.fn.autoshrink = function() { | |
return this.each(function() { | |
var shrinker, $this = $(this); | |
$this.data("autoshrinker", shrinker = new AutoShrinker($this)); | |
shrinker.resize(); | |
$(window).on("resize", function() { | |
shrinker.resize(); | |
}); | |
}); | |
}; | |
})(jQuery); |
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<script> | |
$("h1").autoshrink(); | |
</script> | |
<div> | |
<h1>Shrink Me</h1> | |
</div> |
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Thanks for this easy solution!
I needed a small improvement for live editing (like an live preview text from an input field). May someone need it, too :)
Call example:
$(id+'>h4').autoshrink(['input#id','keyup']);
Sorry for not the cleanest code, isn't my main language..