1 /* 2 Copyright 2008-2016 3 Matthias Ehmann, 4 Michael Gerhaeuser, 5 Carsten Miller, 6 Bianca Valentin, 7 Alfred Wassermann, 8 Peter Wilfahrt 9 10 This file is part of JSXGraph. 11 12 JSXGraph is free software dual licensed under the GNU LGPL or MIT License. 13 14 You can redistribute it and/or modify it under the terms of the 15 16 * GNU Lesser General Public License as published by 17 the Free Software Foundation, either version 3 of the License, or 18 (at your option) any later version 19 OR 20 * MIT License: https://github.com/jsxgraph/jsxgraph/blob/master/LICENSE.MIT 21 22 JSXGraph is distributed in the hope that it will be useful, 23 but WITHOUT ANY WARRANTY; without even the implied warranty of 24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 GNU Lesser General Public License for more details. 26 27 You should have received a copy of the GNU Lesser General Public License and 28 the MIT License along with JSXGraph. If not, see <http://www.gnu.org/licenses/> 29 and <http://opensource.org/licenses/MIT/>. 30 */ 31 32 33 /*global JXG: true, define: true, window: true*/ 34 /*jslint nomen: true, plusplus: true*/ 35 36 /* depends: 37 jxg 38 utils/env 39 utils/type 40 */ 41 42 /** 43 * @fileoverview In this file the Text element is defined. 44 */ 45 46 define([ 47 'jxg', 'utils/env', 'utils/type' 48 ], function (JXG, Env, Type) { 49 50 "use strict"; 51 52 var priv = { 53 InputInputEventHandler: function (evt) { 54 this._value = this.rendNodeInput.value; 55 this.board.update(); 56 } 57 }; 58 59 /** 60 * @class This element is used to provide a constructor for special texts containing a form input element. 61 * 62 * @pseudo 63 * @description 64 * @name Input 65 * @augments Text 66 * @constructor 67 * @type JXG.Text 68 * 69 * @param {number,function_number,function_String_String} x,y,value,label Parent elements for input elements. 70 * <p> 71 * x and y are the coordinates of the lower left corner of the text box. The position of the text is fixed, 72 * x and y are numbers. The position is variable if x or y are functions. 73 * <p> 74 * The default value of the input element may be given as string. 75 * <p> 76 * The label of the input element may be given as string. 77 * 78 * @example 79 * // Create an input element at position [1,4]. 80 * var input = board.create('input', [0, 1, 'sin(x)*x', 'f(x)='], {}); 81 * var f = board.jc.snippet(input.Value(), true, 'x', false); 82 * var graph = board.create('functiongraph',[f, 83 * function() {text:dsddfghj 84 * var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[0,0],board); 85 * return c.usrCoords[1]; 86 * }, 87 * function() { 88 * var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[board.canvasWidth,0],board); 89 * return c.usrCoords[1]; 90 * } 91 * ]); 92 * 93 * board.create('text', [1, 3, '<button onclick="updateGraph()">Update graph</button>']); 94 * 95 * var updateGraph = function() { 96 * graph.Y = board.jc.snippet(input.Value(), true, 'x', false); 97 * graph.updateCurve(); 98 * board.update(); 99 * } 100 * </pre><div class="jxgbox"id="c70f55f1-21ba-4719-a37d-a93ae2943faa" style="width: 500px; height: 300px;"></div> 101 * <script type="text/javascript"> 102 * var t1_board = JXG.JSXGraph.initBoard('c70f55f1-21ba-4719-a37d-a93ae2943faa', {boundingbox: [-3, 6, 5, -3], axis: true, showcopyright: false, shownavigation: false}); 103 * var input = t1_board.create('input', [1, 4, 'sin(x)*x', 'f(x)='], {}); 104 * var f = t1_board.jc.snippet(input.Value(), true, 'x', false); 105 * var graph = t1_board.create('functiongraph',[f, 106 * function() { 107 * var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[0,0],t1_board); 108 * return c.usrCoords[1]; 109 * }, 110 * function() { 111 * var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[t1_board.canvasWidth,0],t1_board); 112 * return c.usrCoords[1]; 113 * } 114 * ]); 115 * 116 * t1_board.create('text', [1, 3, '<button onclick="updateGraph()">Update graph</button>']); 117 * 118 * var updateGraph = function() { 119 * graph.Y = t1_board.jc.snippet(input.Value(), true, 'x', false); 120 * graph.updateCurve(); 121 * t1_board.update(); 122 * } 123 * </script><pre> 124 */ 125 JXG.createInput = function (board, parents, attributes) { 126 var t, par, 127 attr = Type.copyAttributes(attributes, board.options, 'input'); 128 129 //if (parents.length !== 4) { 130 //throw new Error("JSXGraph: Can't create input with parent types '" + 131 // (typeof parents[0]) + "' and '" + (typeof parents[1]) + "'." + 132 // "\nPossible parents are: [x, y, value, label]"); 133 //} 134 135 par = [parents[0], parents[1], 136 '<form style="display:inline">' + 137 '<span></span><input type="text" />' + 138 '</form>' 139 ]; 140 141 t = JXG.createText(board, par, attr); 142 t.type = Type.OBJECT_TYPE_INPUT; 143 144 t.rendNodeForm = t.rendNode.childNodes[0]; 145 t.rendNodeForm.id = t.rendNode.id + '_form'; 146 147 t.rendNodeLabel = t.rendNodeForm.childNodes[0]; 148 t.rendNodeLabel.id = t.rendNode.id + '_label'; 149 t.rendNodeLabel.innerHTML = parents[3]; 150 151 t.rendNodeInput = t.rendNodeForm.childNodes[1]; 152 t.rendNodeInput.id = t.rendNode.id + '_input'; 153 t.rendNodeInput.value = parents[2]; 154 155 t.rendNodeTag = t.rendNodeInput; // Needed for unified treatment in setAttribute 156 t.rendNodeTag.disabled = !!attr.disabled; 157 158 // This sets the font-size of the input HTML element 159 t.visPropOld.fontsize = "0px"; 160 board.renderer.updateTextStyle(t, false); 161 162 t._value = parents[2]; 163 164 t.Value = function () { 165 return this._value; 166 }; 167 168 t.update = function () { 169 if (this.needsUpdate) { 170 this._value = this.rendNodeInput.value; 171 } 172 return this; 173 }; 174 175 Env.addEvent(t.rendNodeInput, 'input', priv.InputInputEventHandler, t); 176 177 //Env.addEvent(t.rendNodeInput, 'mousedown', function(evt) { evt.stopPropagation(); }, t); 178 179 return t; 180 }; 181 182 JXG.registerElement('input', JXG.createInput); 183 184 return { 185 createInput: JXG.createInput 186 }; 187 }); 188