L'exemple de cet article décrit la méthode de génération d'un formulaire de requête SQL à l'aide de JavaScript. Partagez-le avec tout le monde pour votre référence. Les détails sont les suivants :
JavaScript est utilisé ici pour générer un formulaire de requête SQL complexe. Vous comprendrez après l'avoir exécuté. Il peut modifier automatiquement votre instruction SQL en fonction des conditions de requête sélectionnées.
La capture d'écran de l'effet en cours d'exécution est la suivante :
Le code spécifique est le suivant :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>查询条件表单</title> <style> *{ font-size:12px; padding:0; margin:0; } body{ padding:40px; } #MainBox{ border:#666 1px solid; background-color:#eee; width:700px; } #MainBox td{ padding:4px; } #ConditionBox{ height:150px; width:100%; overflow-y:auto; border:#bbb 1px solid; padding:2px; background-color:#fff; } .tmFrame{ border:#eee 1px solid; padding:2px; width:100%; } .tmFrame_highlight{ border:#666 1px solid; padding:2px; width:100%; background-color:#f7f7f7; } .fname{ float:left; width:200px; } .conn{ float:left; width:100px; } .fvalue{ float:left; width:100px; } .handlebox{ float:right; width:180px; display:none; } .handlebox_view{ float:right; width:180px; display:block; } .rbox{ float:right; margin:1px; background-color:#999; color:#fff; padding:1px; width:15px; cursor:hand; } legend{ border:#bbb 1px solid; padding:4px; } fieldset{ border:#bbb 1px solid; padding:4px; } .sqlwords{ margin:2px; border:#bbb 1px solid; width:100%; } </style> <script> ////构造函数 function ce(e){return document.createElement(e)} /* Example: * var a = cex("DIV", {onmouseover:foo, name:'div1', id:'main'}); */ function cex(e, x){ var a = ce(e); for (prop in x){ a[prop] = x[prop]; } return a; } /* * function ge * Shorthand function for document.getElementById(i) */ function ge(i){return document.getElementById(i)} /* * function ac * Example: ac( house, ac(roof, shingles), ac(floor, ac(tiles, grout))) */ function ac(){ if (ac.arguments.length > 1){ var a = ac.arguments[0]; for (i=1; i<ac.arguments.length; i++){ if (arguments[i]) a.appendChild(ac.arguments[i]); } return a; } else { return null; } } /////ID增量 function guid(){ if (!window.__id) window.__id = 0; return ++window.__id; } //======建立条件类 function term(tname,fname,conn,fvalue,ttype){ this.tname=tname; this.fname=fname; this.conn=conn; this.fvalue=fvalue; this.id= guid(); this.ttype=ttype; } term.prototype.getHTML = function(){ var termFrame = cex("DIV", { id:this.id, className:'tmframe', onmouseover:this.fc_term_onmouseover(), onmouseout:this.fc_term_onmouseout() }); //var module = cex("DIV", { //id:'module'+this.id, //className:'module' //}); var tttt=this.tname+"."+this.fname; if(this.ttype!='fset') tttt=this.tname; var mtt = cex("input", { id:'tp'+this.id, name:'fname'+this.id, type:"hidden", value:this.ttype }); var fname = cex("DIV", { id:'fname'+this.id, className:'fname', innerHTML:tttt }); var conn = cex("DIV", { id:'conn'+this.id, className:'conn', innerHTML:this.conn }); var fvalue = cex("DIV", { id:'fvalue'+this.id, className:'fvalue', innerHTML:this.fvalue }); var handlebox = cex("div", { id:'handlebox'+this.id, className:"handlebox" }); var mdel = cex("div", { id:'tmdel'+this.id, onclick:this.fc_mdel_onclick(), className:"rbox", title:"删除此条件", innerHTML: 'X' }); var mup = cex("div", { id:'tmup'+this.id, onclick:this.fc_mup_onclick(), className:"rbox", title:"向上移动", innerHTML: '↑' }); var mdown = cex("div", { id:'tmdown'+this.id, onclick:this.fc_mdown_onclick(), className:"rbox", title:"向下移动", innerHTML: '↓' }); var mzkh = cex("div", { id:'tzkh'+this.id, onclick:this.fc_mzkh_onclick(), className:"rbox", title:"添加左括号", innerHTML: '(' }); var mykh = cex("div", { id:'tykh'+this.id, onclick:this.fc_mykh_onclick(), className:"rbox", title:"添加右括号", innerHTML: ')' }); var mand = cex("div", { id:'tand'+this.id, onclick:this.fc_mand_onclick(), className:"rbox", title:"添加并条件", innerHTML: 'and' }); var mor = cex("div", { id:'tor'+this.id, onclick:this.fc_mor_onclick(), className:"rbox", title:"添加或条件", innerHTML: 'or' }); // Build DIV ac (termFrame, mtt, ac (handlebox, mdel, mup, mdown, mykh, mzkh, mand, mor ), fname, conn, fvalue ); return termFrame; } term.prototype.highlight = function(){ ge("handlebox"+this.id).className = 'handlebox_view'; ge(this.id).className = 'tmFrame_highlight'; } term.prototype.lowlight = function(){ ge("handlebox"+this.id).className = 'handlebox'; ge(this.id).className = 'tmFrame'; } term.prototype.remove = function(){ var _this = ge(this.id); _this.parentNode.removeChild(_this); } term.prototype.moveup = function(){ var _this = ge(this.id); var pre_this = _this.previousSibling; if(pre_this!=null){ _this.parentNode.insertBefore(_this,pre_this); this.lowlight(); } } term.prototype.movedown = function(){ var _this = ge(this.id); var next_this = _this.nextSibling; if(next_this!=null){ _this.parentNode.insertBefore(next_this,_this); this.lowlight(); } } term.prototype.addzkh = function(){ var _this = ge(this.id); var tzkh = new term('╭----------------','','','','zkh'); var node_zkh = tzkh.getHTML(); _this.parentNode.insertBefore(node_zkh,_this); } term.prototype.addykh = function(){ var _this = ge(this.id); var tykh = new term('╰----------------','','','','ykh'); var node_ykh = tykh.getHTML(); if(_this.nextSibling!=null) _this.parentNode.insertBefore(node_ykh,_this.nextSibling); else _this.parentNode.appendChild(node_ykh); } term.prototype.addand = function(){ var _this = ge(this.id); var tand = new term(' 并且','','','','tand'); var node_and = tand.getHTML(); if(_this.nextSibling!=null) _this.parentNode.insertBefore(node_and,_this.nextSibling); else _this.parentNode.appendChild(node_and); } term.prototype.addor = function(){ var _this = ge(this.id); var tor = new term(' 或者','','','','tor'); var node_or = tor.getHTML(); if(_this.nextSibling!=null) _this.parentNode.insertBefore(node_or,_this.nextSibling); else _this.parentNode.appendChild(node_or); } ///对象控制函数 term.prototype.fc_term_onmouseover = function(){ var _this = this; return function(){ //if (!_this.isDragging) _this.highlight(); } } term.prototype.fc_term_onmouseout = function(){ var _this = this; return function(){ //if (!_this.isDragging) _this.lowlight(); } } term.prototype.fc_mdel_onclick = function(){ var _this = this; return function(){ _this.remove(); } } term.prototype.fc_mup_onclick = function(){ var _this = this; return function(){ _this.moveup(); } } term.prototype.fc_mdown_onclick = function(){ var _this = this; return function(){ _this.movedown(); } } term.prototype.fc_mzkh_onclick = function(){ var _this = this; return function(){ _this.addzkh(); } } term.prototype.fc_mykh_onclick = function(){ var _this = this; return function(){ _this.addykh(); } } term.prototype.fc_mand_onclick = function(){ var _this = this; return function(){ _this.addand(); } } term.prototype.fc_mor_onclick = function(){ var _this = this; return function(){ _this.addor(); } } /////插入页面 function insertterm(){ var tname = document.all.tname.value; var fname = document.all.fname.value; var conn = document.all.conn.value; var fvalue = document.all.fvalue.value; //xl(tname+"|"+fname+"|"+conn+"|"+fvalue); var tm = new term(tname,fname,conn,fvalue,"fset"); var tmHTML = tm.getHTML(); ac(ge("ConditionBox"),tmHTML); //ZA.addterm(tm); addtofrom(tname); } var tt = new Array(); function addtofrom(tname){ var ttexit="no"; for(var i=0;i<tt.length;i++){ if(tt[i]==tname) ttexit="yes"; } if(ttexit=="no"){ tt[i]=tname; //alert(tt[i]); } } //====条件控制窗口函数 function CBadd(){ var h = document.all.ConditionBox.offsetHeight; document.all.ConditionBox.style.height = h + 20 + "px"; } function CBcut(){ var h = document.all.ConditionBox.offsetHeight; if(h>=150) document.all.ConditionBox.style.height = h - 20 + "px"; else return false; } function getSQL(){ var sql=""; var ma = ge("ConditionBox").childNodes; for(i=0;i<ma.length;i++){ var id = ma[i].getAttribute("id"); var tp = ge("tp"+id).value; if(tp=="fset"){ //sql+=" "+ge("fname"+id).innerHTML; //sql+=" "+ge("conn"+id).innerHTML; //sql+=" \""+ge("fvalue"+id).innerHTML+"\""; var fname=ge("fname"+id).innerHTML; var conn=ge("conn"+id).innerHTML; var fvalue=ge("fvalue"+id).innerHTML; sql+=" "+fname; if(conn=="等于") sql+=" = "+"\'"+fvalue+"\'"; if(conn=="大于") sql+=" > "+"\'"+fvalue+"\'"; if(conn=="小于") sql+=" < "+"\'"+fvalue+"\'"; if(conn=="不等于") sql+=" <> "+"\'"+fvalue+"\'"; if(conn=="为空") sql+=" is null "; if(conn=="不为空") sql+=" is not null "; if(conn=="包含") sql+=" like \'%"+fvalue+"%\'"; } else{ //sql+=" "+ge("fname"+id).innerHTML; if(tp=="zkh") sql+=" ("; if(tp=="ykh") sql+=" )"; if(tp=="tand") sql+=" and"; if(tp=="tor") sql+=" or"; } //var mn = ma.childNodes; } var ffrom = "FROM "+getFrom(); ge("sqlwords").value ="Select * "+ ffrom+" Where "+sql; } function getFrom(){ var ff=tt.toString(); return ff; } </script> </head> <body> <table border="0" cellspacing="0" cellpadding="0" id="MainBox"> <tr> <td colspan="2" style="background-color:#999;color:#000;font-weight:bolder;font-size:14px">复杂查询表单</td> </tr> <tr> <td><div id="ConditionBox"></div> <div style="width:100%"><SPAN title='放大显示框' style='float:right;FONT-SIZE: 14px; CURSOR: hand;FONT-FAMILY: webdings' onclick='CBadd()'>6</SPAN><SPAN title='缩小显示' style='float:right;FONT-SIZE: 14px; CURSOR: hand;FONT-FAMILY: webdings' onclick='CBcut()'>5</SPAN></div></td> </tr> <tr> <td> <fieldset> <legend>SQL表达式</legend> <input type="text" id="sqlwords" class="sqlwords" /><input type="submit" name="Submit" value="GET SQL" onclick="getSQL()" style="float:right"/> </fieldset> </td> </tr> <tr> <td> <fieldset> <legend>定义条件</legend> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td>表</td> <td><select name="tname" id="tname"> <option value="table1" selected="selected">表1</option> <option value="table2">表2</option> <option value="table3">表3</option> <option value="table4">表4</option> <option value="table5">表5</option> </select></td> <td>字段</td> <td><select name="fname" id="fname"> <option value="f1">字段1</option> <option value="f2">字段2</option> <option value="f3">字段3</option> <option value="f4">字段4</option> <option value="f5">字段5</option> <option value="f6">字段6</option> <option value="f7">字段7</option> </select></td> <td>关系</td> <td><select name="conn" id="conn"> <option value="大于">大于</option> <option value="等于">等于</option> <option value="小于">小于</option> <option value="不等于">不等于</option> <option value="为空">为空</option> <option value="不为空">不为空</option> <option value="包含">包含</option> </select></td> <td>值</td> <td><input name="fvalue" type="text" id="fvalue" value="111111" /></td> <td><input type="submit" name="Submit" value="增加新条件" onclick="insertterm()"/></td> </tr> </table> </fieldset> </td> </tr> </table> </body> </html>
J'espère que cet article sera utile à la conception de la programmation JavaScript de chacun.