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Diffstat (limited to 'wiki/lib/scripts/textselection.js')
| -rw-r--r-- | wiki/lib/scripts/textselection.js | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/wiki/lib/scripts/textselection.js b/wiki/lib/scripts/textselection.js new file mode 100644 index 0000000..16874ba --- /dev/null +++ b/wiki/lib/scripts/textselection.js @@ -0,0 +1,152 @@ +/** + * Text selection related functions. + */ + +/** + * selection prototype + * + * Object that capsulates the selection in a textarea. Returned by DWgetSelection. + * + * @author Andreas Gohr <andi@splitbrain.org> + */ +function selection_class(){ + this.start = 0; + this.end = 0; + this.obj = null; + this.scroll = 0; + this.fix = 0; + + this.getLength = function(){ + return this.end - this.start; + }; + + this.getText = function(){ + return (!this.obj) ? '' : this.obj.value.substring(this.start,this.end); + }; +} + +/** + * Get current selection/cursor position in a given textArea + * + * @link http://groups.drupal.org/node/1210 + * @author Andreas Gohr <andi@splitbrain.org> + * @link http://linebyline.blogspot.com/2006/11/textarea-cursor-position-in-internet.html + * @returns object - a selection object + */ +function DWgetSelection(textArea) { + var sel = new selection_class(); + + textArea.focus(); + sel.obj = textArea; + sel.start = textArea.selectionStart; + sel.end = textArea.selectionEnd; + sel.scroll = textArea.scrollTop; + return sel; +} + +/** + * Set the selection + * + * You need to get a selection object via DWgetSelection() first, then modify the + * start and end properties and pass it back to this function. + * + * @link http://groups.drupal.org/node/1210 + * @author Andreas Gohr <andi@splitbrain.org> + * @param {selection_class} selection a selection object as returned by DWgetSelection() + */ +function DWsetSelection(selection){ + selection.obj.setSelectionRange(selection.start, selection.end); + if(selection.scroll) selection.obj.scrollTop = selection.scroll; +} + +/** + * Inserts the given text at the current cursor position or replaces the current + * selection + * + * @author Andreas Gohr <andi@splitbrain.org> + * @param {string} text the new text to be pasted + * @param {selection_class} selection selection object returned by DWgetSelection + * @param {int} opts.startofs number of charcters at the start to skip from new selection + * @param {int} opts.endofs number of characters at the end to skip from new selection + * @param {boolean} opts.nosel set true if new text should not be selected + */ +function pasteText(selection,text,opts){ + if(!opts) opts = {}; + // replace the content + + selection.obj.value = + selection.obj.value.substring(0, selection.start) + text + + selection.obj.value.substring(selection.end, selection.obj.value.length); + + // set new selection + if (is_opera) { + // Opera replaces \n by \r\n when inserting text. + selection.end = selection.start + text.replace(/\r?\n/g, '\r\n').length; + } else { + selection.end = selection.start + text.length; + } + + + // modify the new selection if wanted + if(opts.startofs) selection.start += opts.startofs; + if(opts.endofs) selection.end -= opts.endofs; + + // no selection wanted? set cursor to end position + if(opts.nosel) selection.start = selection.end; + + DWsetSelection(selection); +} + + +/** + * Format selection + * + * Apply tagOpen/tagClose to selection in textarea, use sampleText instead + * of selection if there is none. + * + * @author Andreas Gohr <andi@splitbrain.org> + */ +function insertTags(textAreaID, tagOpen, tagClose, sampleText){ + var txtarea = jQuery('#' + textAreaID)[0]; + + var selection = DWgetSelection(txtarea); + var text = selection.getText(); + var opts; + + // don't include trailing space in selection + if(text.charAt(text.length - 1) == ' '){ + selection.end--; + text = selection.getText(); + } + + if(!text){ + // nothing selected, use the sample text and select it + text = sampleText; + opts = { + startofs: tagOpen.length, + endofs: tagClose.length + }; + }else{ + // place cursor at the end + opts = { + nosel: true + }; + } + + // surround with tags + text = tagOpen + text + tagClose; + + // do it + pasteText(selection,text,opts); +} + +/** + * Wraps around pasteText() for backward compatibility + * + * @author Andreas Gohr <andi@splitbrain.org> + */ +function insertAtCarret(textAreaID, text){ + var txtarea = jQuery('#' + textAreaID)[0]; + var selection = DWgetSelection(txtarea); + pasteText(selection,text,{nosel: true}); +} |