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67 lines
1.8 KiB
JavaScript
Executable File
67 lines
1.8 KiB
JavaScript
Executable File
/**********************************************************************
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*
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*
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*
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**********************************************************************/
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HTMLTextAreaElement.prototype.updateSize = function(){
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this.style.height = ''
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this.style.height = this.scrollHeight + 'px'
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return this }
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HTMLTextAreaElement.prototype.autoUpdateSize = function(){
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var that = this
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this.addEventListener('input',
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function(evt){
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that.updateSize() })
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return this }
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// calculate number of lines in text area (both wrapped and actual lines)
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Object.defineProperty(HTMLTextAreaElement.prototype, 'heightLines', {
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enumerable: false,
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get: function(){
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var style = getComputedStyle(this)
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return Math.floor(
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(this.scrollHeight
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- parseFloat(style.paddingTop)
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- parseFloat(style.paddingBottom))
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/ (parseFloat(style.lineHeight)
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|| parseFloat(style.fontSize))) }, })
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Object.defineProperty(HTMLTextAreaElement.prototype, 'lines', {
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enumerable: false,
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get: function(){
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return this.value
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.split(/\n/g)
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.length }, })
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// XXX this does not account for wrapping...
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Object.defineProperty(HTMLTextAreaElement.prototype, 'caretLine', {
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enumerable: false,
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get: function(){
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var offset = this.selectionStart
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return offset != null ?
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this.value
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.slice(0, offset)
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.split(/\n/g)
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.length
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: undefined }, })
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Object.defineProperty(HTMLTextAreaElement.prototype, 'caretOffset', {
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enumerable: false,
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get: function(){
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var offset = this.selectionStart
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var r = document.createRange()
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r.setStart(this, offset)
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r.setEnd(this, offset)
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var rect = r.getBoundingClientRect()
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return {
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top: rect.top,
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left: rect.left,
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} },
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})
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/**********************************************************************
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* vim:set ts=4 sw=4 : */
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